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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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Home Loan Bank, Advances, Activity for Year, Average Interest Rate for Year","description":"The calculated weighted average interest rate for Federal Home Loan Bank advances for the period ended as of the Balance Sheet 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Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.","units":{"USD":[{"end":"2014-12-31","val":380000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2014Q4I"},{"end":"2015-12-31","val":715000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11"},{"end":"2015-12-31","val":715000,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1700000,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10"},{"end":"2016-12-31","val":1700000,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2017Q4I"}]}},"LoansReceivableNet":{"label":"Loans Receivable, Net (Deprecated 2019-01-31)","description":"Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements.","units":{"USD":[{"end":"2010-12-31","val":1164056000,"accn":"0001437749-12-002064","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-07","frame":"CY2010Q4I"},{"end":"2010-12-31","val":1164056000,"accn":"0001437749-11-008108","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"end":"2010-12-31","val":1164056000,"accn":"0001437749-11-005586","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2011-06-30","val":1102796000,"accn":"0001437749-11-005586","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2I"},{"end":"2011-09-30","val":1070227000,"accn":"0001437749-11-008108","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07","frame":"CY2011Q3I"},{"end":"2011-12-31","val":1043844000,"accn":"0001437749-12-004737","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2011Q4I"},{"end":"2011-12-31","val":1043844000,"accn":"0001437749-12-002064","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-07"},{"end":"2012-03-31","val":1019508000,"accn":"0001437749-12-004737","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2012Q1I"}]}},"LongTermDebt":{"label":"Long-term Debt","description":"Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.","units":{"USD":[{"end":"2011-12-31","val":239664000,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2011Q4I"},{"end":"2012-12-31","val":178267000,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"end":"2012-12-31","val":178267000,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012Q4I"},{"end":"2013-12-31","val":176850000,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07"},{"end":"2013-12-31","val":176850000,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013Q4I"},{"end":"2014-12-31","val":168694000,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"end":"2014-12-31","val":168694000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2014Q4I"},{"end":"2015-12-31","val":169250000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11"},{"end":"2015-12-31","val":169250000,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015Q4I"},{"end":"2016-12-31","val":53437000,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10"},{"end":"2016-12-31","val":52152000,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2016Q4I"},{"end":"2017-12-31","val":36985000,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive":{"label":"Long-Term Debt, Maturity, after Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":53238000,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2012Q4I"},{"end":"2013-12-31","val":50084000,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":49906000,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"},{"end":"2015-12-31","val":48970000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"},{"end":"2016-12-31","val":33506000,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"},{"end":"2017-12-31","val":33506000,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths":{"label":"Long-Term Debt, Maturity, Year One","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":2000000,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2012Q4I"},{"end":"2013-12-31","val":8012000,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":254000,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"},{"end":"2015-12-31","val":716000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"},{"end":"2016-12-31","val":3251000,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"},{"end":"2017-12-31","val":3000000,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive":{"label":"Long-Term Debt, Maturity, Year Five","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":115000000,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2012Q4I"},{"end":"2013-12-31","val":3000000,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":25000,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"},{"end":"2015-12-31","val":789000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour":{"label":"Long-Term Debt, Maturity, Year Four","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":115000000,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":3000000,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"},{"end":"2015-12-31","val":270000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"},{"end":"2016-12-31","val":636000,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree":{"label":"Long-Term Debt, Maturity, Year Three","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2013-12-31","val":503000,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":115000000,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"},{"end":"2015-12-31","val":3249000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"},{"end":"2016-12-31","val":786000,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"},{"end":"2017-12-31","val":474000,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2017Q4I"}]}},"LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo":{"label":"Long-Term Debt, Maturity, Year Two","description":"Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).","units":{"USD":[{"end":"2012-12-31","val":8029000,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2012Q4I"},{"end":"2013-12-31","val":251000,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2013Q4I"},{"end":"2014-12-31","val":509000,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2014Q4I"},{"end":"2015-12-31","val":115256000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"},{"end":"2016-12-31","val":15258000,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2016Q4I"},{"end":"2017-12-31","val":5000,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2017Q4I"}]}},"LongtermDebtWeightedAverageInterestRate":{"label":"Long-term Debt, Weighted Average Interest Rate, at Point in Time","description":"Weighted average interest rate of long-term debt outstanding calculated at point in time.","units":{"pure":[{"end":"2011-12-31","val":0.0405,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2011Q4I"},{"end":"2012-12-31","val":0.0336,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"end":"2012-12-31","val":0.0336,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07","frame":"CY2012Q4I"},{"end":"2013-12-31","val":0.0334,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07"},{"end":"2013-12-31","val":0.0334,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2013Q4I"},{"end":"2014-12-31","val":0.0329,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12"},{"end":"2014-12-31","val":0.0329,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2014Q4I"},{"end":"2015-12-31","val":0.0334,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11"},{"end":"2015-12-31","val":0.0334,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10","frame":"CY2015Q4I"},{"end":"2016-12-31","val":0.0284,"accn":"0001437749-17-004264","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-10"},{"end":"2016-12-31","val":0.0289,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2016Q4I"},{"end":"2017-12-31","val":0.0289,"accn":"0001437749-18-004397","fy":2017,"fp":"FY","form":"10-K","filed":"2018-03-12","frame":"CY2017Q4I"}]}},"MoneyMarketFundsAtCarryingValue":{"label":"Money Market Funds, at Carrying Value","description":"Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. 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May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.","units":{"shares":[{"end":"2010-12-31","val":30000,"accn":"0001437749-11-005586","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08"},{"end":"2010-12-31","val":30000,"accn":"0001437749-11-008108","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07"},{"end":"2010-12-31","val":30000,"accn":"0001437749-12-002064","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-07","frame":"CY2010Q4I"},{"end":"2011-06-30","val":30000,"accn":"0001437749-11-005586","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-08","frame":"CY2011Q2I"},{"end":"2011-09-30","val":30000,"accn":"0001437749-11-008108","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-07","frame":"CY2011Q3I"},{"end":"2011-12-31","val":30000,"accn":"0001437749-12-002064","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-07"},{"end":"2011-12-31","val":30000,"accn":"0001437749-12-004737","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09"},{"end":"2011-12-31","val":30000,"accn":"0001437749-12-009070","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-08-31"},{"end":"2011-12-31","val":30000,"accn":"0001437749-12-011255","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"end":"2011-12-31","val":30000,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08","frame":"CY2011Q4I"},{"end":"2012-03-31","val":30000,"accn":"0001437749-12-004737","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-09","frame":"CY2012Q1I"},{"end":"2012-06-30","val":30000,"accn":"0001437749-12-009070","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-08-31","frame":"CY2012Q2I"},{"end":"2012-09-30","val":30000,"accn":"0001437749-12-011255","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08","frame":"CY2012Q3I"},{"end":"2012-12-31","val":30000,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"end":"2012-12-31","val":30000,"accn":"0001437749-13-005540","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08"},{"end":"2012-12-31","val":30000,"accn":"0001437749-13-010311","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08"},{"end":"2012-12-31","val":30000,"accn":"0001437749-13-014000","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-06","frame":"CY2012Q4I"},{"end":"2013-03-31","val":30000,"accn":"0001437749-13-005540","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-08","frame":"CY2013Q1I"},{"end":"2013-06-30","val":30000,"accn":"0001437749-13-010311","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-08","frame":"CY2013Q2I"},{"end":"2013-09-30","val":30000,"accn":"0001437749-13-014000","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-06","frame":"CY2013Q3I"},{"end":"2014-12-31","val":10000,"accn":"0001437749-15-019981","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06"},{"end":"2014-12-31","val":10000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2014Q4I"},{"end":"2015-09-30","val":0,"accn":"0001437749-15-019981","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-06","frame":"CY2015Q3I"},{"end":"2015-12-31","val":0,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11","frame":"CY2015Q4I"}]}},"PreferredStockSharesOutstanding":{"label":"Preferred Stock, Shares Outstanding","description":"Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. 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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable preferred shares, par value and other disclosure concepts are in another section within stockholders' 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from Issuance of Preferred Stock and Preference Stock","description":"Proceeds from issuance of capital stock which provides for a specific dividend that is paid to the shareholders before any dividends to common stockholders and which takes precedence over common stockholders in the event of liquidation.","units":{"USD":[{"end":"2009-01-09","val":30000000,"accn":"0001437749-16-027462","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-11"},{"start":"2009-01-01","end":"2009-01-31","val":30000000,"accn":"0001437749-12-009070","fy":2012,"fp":"Q2","form":"10-Q/A","filed":"2012-08-31"},{"start":"2009-01-01","end":"2009-01-31","val":30000000,"accn":"0001437749-12-011255","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-08"},{"start":"2009-01-01","end":"2009-01-31","val":30000000,"accn":"0001437749-13-002517","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-08"},{"start":"2009-01-01","end":"2009-01-31","val":30000000,"accn":"0001437749-14-003694","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-07"},{"start":"2009-01-01","end":"2009-01-31","val":30000000,"accn":"0001437749-15-004839","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-12","frame":"CY2008Q4I"},{"start":"2009-01-01","end":"2009-12-31","val":29961000,"accn":"0001437749-12-002064","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-07","frame":"CY2009"}]}},"ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans":{"label":"Proceeds, Issuance of Shares, Share-based Payment Arrangement, Excluding Option Exercised","description":"Amount of cash inflow from issuance of shares under share-based payment arrangement. Excludes option 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from Life Insurance Policy","description":"Amount of cash inflow for proceeds from settlement of corporate-owned life insurance policy, classified as investing activities. 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