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Excludes amount 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substance.","units":{"USD":[{"end":"2012-12-31","val":2086000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"}]}},"BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed":{"label":"Business Acquisition, Purchase Price Allocation, Liabilities Assumed (Deprecated 2013-01-31)","description":"The amount of acquisition cost of a business combination allocated to liabilities assumed.","units":{"USD":[{"end":"2011-12-31","val":372000,"accn":"0001193125-12-130007","fy":2011,"fp":"FY","form":"10-K","filed":"2012-03-23","frame":"CY2011Q4I"},{"end":"2012-12-31","val":101130000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2012Q4I"}]}},"BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment":{"label":"Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment (Deprecated 2013-01-31)","description":"The amount of acquisition cost of a business combination 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period.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":8620000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":7927000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"start":"2011-01-01","end":"2011-12-31","val":9529000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":8545000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"start":"2012-01-01","end":"2012-12-31","val":9345000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"start":"2012-01-01","end":"2012-12-31","val":9345000,"accn":"0001193125-15-094011","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":10219000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"start":"2013-01-01","end":"2013-12-31","val":10219000,"accn":"0001193125-15-094011","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16"},{"start":"2013-01-01","end":"2013-12-31","val":10219000,"accn":"0001193125-16-505348","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2013"}]}},"BusinessAcquisitionsProFormaRevenue":{"label":"Business 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period.","units":{"USD":[{"start":"2010-01-01","end":"2010-12-31","val":53940000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2010"},{"start":"2011-01-01","end":"2011-12-31","val":52786000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"start":"2011-01-01","end":"2011-12-31","val":63644000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":56287000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"start":"2012-01-01","end":"2012-12-31","val":67299000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"start":"2012-01-01","end":"2012-12-31","val":67299000,"accn":"0001193125-15-094011","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2012"},{"start":"2013-01-01","end":"2013-12-31","val":65880000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"start":"2013-01-01","end":"2013-12-31","val":65880000,"accn":"0001193125-15-094011","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16"},{"start":"2013-01-01","end":"2013-12-31","val":65880000,"accn":"0001193125-16-505348","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2013"}]}},"BusinessCombinationAcquisitionRelatedCosts":{"label":"Business 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Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.","units":{"USD":[{"start":"2011-01-01","end":"2011-12-31","val":1769000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"start":"2011-01-01","end":"2011-12-31","val":1769000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2011"},{"start":"2012-01-01","end":"2012-12-31","val":21378000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"start":"2012-01-01","end":"2012-12-31","val":21378000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2012"},{"start":"2013-01-01","end":"2013-09-30","val":12400000,"accn":"0001193125-13-442087","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-11-14"},{"start":"2013-01-01","end":"2013-09-30","val":801000,"accn":"0001193125-14-405569","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10"},{"start":"2013-07-01","end":"2013-09-30","val":801000,"accn":"0001193125-14-405569","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-10","frame":"CY2013Q3"},{"start":"2013-01-01","end":"2013-12-31","val":12400000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2013"}]}},"BusinessCombinationConsiderationTransferred":{"label":"Business 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defined by regulatory framework.","units":{"USD":[{"end":"2011-12-31","val":100957000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28","frame":"CY2011Q4I"},{"end":"2012-12-31","val":118109000,"accn":"0001193125-13-129908","fy":2012,"fp":"FY","form":"10-K","filed":"2013-03-28"},{"end":"2012-12-31","val":118109000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17","frame":"CY2012Q4I"},{"end":"2013-12-31","val":123555000,"accn":"0001193125-14-102610","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-17"},{"end":"2013-12-31","val":123556000,"accn":"0001193125-15-094011","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2013Q4I"},{"end":"2014-12-31","val":131597000,"accn":"0001193125-15-094011","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-16","frame":"CY2014Q4I"}]}},"CapitalRequiredForCapitalAdequacy":{"label":"Banking Regulation, Total Risk-Based Capital, Capital Adequacy, 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