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Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. 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Includes shares issued in an initial public offering or a secondary public 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forfeited.","units":{"USD":[{"start":"2016-01-01","end":"2016-09-30","val":0,"accn":"0001109189-16-000334","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09"},{"start":"2018-01-01","end":"2018-12-31","val":3000,"accn":"0001109189-19-000025","fy":2018,"fp":"FY","form":"10-K","filed":"2019-03-05"},{"start":"2018-01-01","end":"2018-12-31","val":3000,"accn":"0001109189-20-000059","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-13","frame":"CY2018"},{"start":"2019-01-01","end":"2019-12-31","val":-331000,"accn":"0001109189-20-000059","fy":2019,"fp":"FY","form":"10-K","filed":"2020-03-13"},{"start":"2019-01-01","end":"2019-12-31","val":-331000,"accn":"0001109189-21-000033","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-31","frame":"CY2019"}]}},"StockIssuedDuringPeriodValueShareBasedCompensation":{"label":"Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture","description":"Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).","units":{"USD":[{"start":"2020-01-01","end":"2020-12-31","val":-16000,"accn":"0001109189-21-000033","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-31","frame":"CY2020"}]}},"StockIssuedDuringPeriodValueStockOptionsExercised":{"label":"Stock Issued During Period, Value, Stock Options Exercised","description":"Value of stock issued as a result of the exercise of stock options.","units":{"USD":[{"start":"2019-04-01","end":"2019-06-30","val":0,"accn":"0001109189-20-000134","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07","frame":"CY2019Q2"}]}},"StockRepurchasedDuringPeriodShares":{"label":"Stock Repurchased During Period, Shares","description":"Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.","units":{"shares":[{"start":"2012-04-01","end":"2012-06-30","val":535015,"accn":"0001193125-12-322667","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-30","frame":"CY2012Q2"},{"start":"2012-07-01","end":"2012-09-30","val":661773,"accn":"0001193125-12-440074","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3"}]}},"StockRepurchasedDuringPeriodValue":{"label":"Stock Repurchased During Period, Value","description":"Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.","units":{"USD":[{"start":"2012-01-01","end":"2012-06-30","val":5000000,"accn":"0001193125-12-322667","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-30"},{"start":"2012-07-01","end":"2012-09-30","val":6400000,"accn":"0001193125-12-440074","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30","frame":"CY2012Q3"}]}},"StockRepurchaseProgramAuthorizedAmount":{"label":"Stock Repurchase Program, Authorized Amount (Deprecated 2014-01-31)","description":"Amount of a stock repurchase plan authorized by an entity's Board of Directors.","units":{"USD":[{"start":"2008-10-12","end":"2008-10-13","val":50000000,"accn":"0001193125-12-077986","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24"},{"start":"2012-01-01","end":"2012-06-30","val":50000000,"accn":"0001193125-12-322667","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-30"},{"start":"2012-01-01","end":"2012-09-30","val":50000000,"accn":"0001193125-12-440074","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-30"}]}},"StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased":{"label":"Stock Repurchase Program, Number of Shares Authorized to be Repurchased","description":"The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.","units":{"shares":[{"end":"2009-12-31","val":809093,"accn":"0001193125-12-077986","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-24","frame":"CY2009Q4I"}]}},"StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1":{"label":"Stock Repurchase Program, Remaining Authorized Repurchase Amount","description":"Amount remaining of a stock repurchase plan authorized.","units":{"USD":[{"end":"2016-06-30","val":9500000,"accn":"0001109189-16-000309","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-07-29","frame":"CY2016Q2I"},{"end":"2016-09-30","val":9500000,"accn":"0001109189-16-000334","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-09","frame":"CY2016Q3I"}]}},"TemporaryEquityCarryingAmountAttributableToParent":{"label":"Temporary Equity, Carrying Amount, Attributable to Parent","description":"Carrying amount, attributable to parent, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.","units":{"USD":[{"end":"2019-12-31","val":0,"accn":"0001109189-20-000113","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-06-29"},{"end":"2019-12-31","val":0,"accn":"0001109189-20-000134","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07"},{"end":"2019-12-31","val":0,"accn":"0001109189-20-000154","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-02"},{"end":"2019-12-31","val":0,"accn":"0001109189-21-000033","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-31","frame":"CY2019Q4I"},{"end":"2020-03-31","val":22000000,"accn":"0001109189-20-000113","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-06-29","frame":"CY2020Q1I"},{"end":"2020-06-30","val":22000000,"accn":"0001109189-20-000134","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07","frame":"CY2020Q2I"},{"end":"2020-09-30","val":22000000,"accn":"0001109189-20-000154","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-02","frame":"CY2020Q3I"},{"end":"2020-12-31","val":22000000,"accn":"0001109189-21-000033","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-31"},{"end":"2020-12-31","val":22000000,"accn":"0001109189-21-000047","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-17","frame":"CY2020Q4I"},{"end":"2021-03-31","val":22000000,"accn":"0001109189-21-000047","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-17","frame":"CY2021Q1I"}]}},"TemporaryEquityParOrStatedValuePerShare":{"label":"Temporary Equity, Par or Stated Value Per Share","description":"Per share amount of par value or stated value of stock classified as temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable.","units":{"USD/shares":[{"end":"2019-12-31","val":0.01,"accn":"0001109189-20-000154","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-02"},{"end":"2019-12-31","val":0.01,"accn":"0001109189-21-000033","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-31","frame":"CY2019Q4I"},{"end":"2020-03-31","val":0.01,"accn":"0001109189-20-000113","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-06-29","frame":"CY2020Q1I"},{"end":"2020-06-30","val":0.01,"accn":"0001109189-20-000134","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07","frame":"CY2020Q2I"},{"end":"2020-09-30","val":0.01,"accn":"0001109189-20-000154","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-02","frame":"CY2020Q3I"},{"end":"2020-12-31","val":0.01,"accn":"0001109189-21-000033","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-31"},{"end":"2020-12-31","val":0.01,"accn":"0001109189-21-000047","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-17","frame":"CY2020Q4I"},{"end":"2021-03-31","val":0.01,"accn":"0001109189-21-000047","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-17","frame":"CY2021Q1I"}]}},"TemporaryEquitySharesAuthorized":{"label":"Temporary Equity, Shares Authorized","description":"The maximum number of securities classified as temporary equity that are permitted to be issued by an entity's charter and bylaws. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.","units":{"shares":[{"end":"2019-12-31","val":5000000,"accn":"0001109189-20-000154","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-02"},{"end":"2019-12-31","val":5000000,"accn":"0001109189-21-000033","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-31","frame":"CY2019Q4I"},{"end":"2020-03-31","val":5000000,"accn":"0001109189-20-000113","fy":2020,"fp":"Q1","form":"10-Q","filed":"2020-06-29","frame":"CY2020Q1I"},{"end":"2020-06-30","val":5000000,"accn":"0001109189-20-000134","fy":2020,"fp":"Q2","form":"10-Q","filed":"2020-08-07","frame":"CY2020Q2I"},{"end":"2020-09-30","val":5000000,"accn":"0001109189-20-000154","fy":2020,"fp":"Q3","form":"10-Q","filed":"2020-11-02","frame":"CY2020Q3I"},{"end":"2020-12-31","val":5000000,"accn":"0001109189-21-000033","fy":2020,"fp":"FY","form":"10-K","filed":"2021-03-31"},{"end":"2020-12-31","val":5000000,"accn":"0001109189-21-000047","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-17","frame":"CY2020Q4I"},{"end":"2021-03-31","val":5000000,"accn":"0001109189-21-000047","fy":2021,"fp":"Q1","form":"10-Q","filed":"2021-05-17","frame":"CY2021Q1I"}]}},"TemporaryEquitySharesOutstanding":{"label":"Temporary Equity, Shares Outstanding","description":"The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. 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