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For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.","units":{"USD":[{"end":"2009-12-31","val":539235000,"accn":"0000820736-10-000030","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-30"},{"end":"2009-12-31","val":539235000,"accn":"0000820736-10-000038","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-29"},{"end":"2009-12-31","val":539235000,"accn":"0000820736-11-000017","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2009Q4I"},{"end":"2010-06-30","val":555009000,"accn":"0000820736-10-000030","fy":2010,"fp":"Q2","form":"10-Q","filed":"2010-07-30","frame":"CY2010Q2I"},{"end":"2010-09-30","val":555108000,"accn":"0000820736-10-000038","fy":2010,"fp":"Q3","form":"10-Q","filed":"2010-10-29","frame":"CY2010Q3I"},{"end":"2010-12-31","val":558015000,"accn":"0000820736-11-000017","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"end":"2010-12-31","val":558015000,"accn":"0000820736-11-000033","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-29"},{"end":"2010-12-31","val":558015000,"accn":"0000820736-11-000050","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-08-29"},{"end":"2010-12-31","val":558015000,"accn":"0000820736-11-000058","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27"},{"end":"2010-12-31","val":558015000,"accn":"0000820736-12-000022","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2010Q4I"},{"end":"2011-03-31","val":560784000,"accn":"0000820736-11-000033","fy":2011,"fp":"Q1","form":"10-Q","filed":"2011-04-29","frame":"CY2011Q1I"},{"end":"2011-06-30","val":562931000,"accn":"0000820736-11-000050","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-08-29","frame":"CY2011Q2I"},{"end":"2011-09-30","val":564018000,"accn":"0000820736-11-000058","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27","frame":"CY2011Q3I"},{"end":"2011-12-31","val":566624000,"accn":"0000820736-12-000022","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"end":"2011-12-31","val":566624000,"accn":"0000820736-12-000045","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-27"},{"end":"2011-12-31","val":566624000,"accn":"0000820736-12-000072","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-27"},{"end":"2011-12-31","val":566624000,"accn":"0000820736-12-000080","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-29"},{"end":"2011-12-31","val":566624000,"accn":"0000820736-13-000011","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2011Q4I"},{"end":"2012-03-31","val":568405000,"accn":"0000820736-12-000045","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-04-27","frame":"CY2012Q1I"},{"end":"2012-06-30","val":570126000,"accn":"0000820736-12-000072","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-07-27","frame":"CY2012Q2I"},{"end":"2012-09-30","val":572469000,"accn":"0000820736-12-000080","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-10-29","frame":"CY2012Q3I"},{"end":"2012-12-31","val":575300000,"accn":"0000820736-13-000011","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"end":"2012-12-31","val":575300000,"accn":"0000820736-13-000031","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-25"},{"end":"2012-12-31","val":575300000,"accn":"0000820736-13-000054","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-25"},{"end":"2012-12-31","val":575300000,"accn":"0000820736-13-000064","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-24"},{"end":"2012-12-31","val":575300000,"accn":"0000820736-14-000017","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2012Q4I"},{"end":"2013-03-31","val":580153000,"accn":"0000820736-13-000031","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-04-25","frame":"CY2013Q1I"},{"end":"2013-06-30","val":584040000,"accn":"0000820736-13-000054","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-07-25","frame":"CY2013Q2I"},{"end":"2013-09-30","val":584596000,"accn":"0000820736-13-000064","fy":2013,"fp":"Q3","form":"10-Q","filed":"2013-10-24","frame":"CY2013Q3I"},{"end":"2013-12-31","val":587240000,"accn":"0000820736-14-000017","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25"},{"end":"2013-12-31","val":587240000,"accn":"0000820736-14-000039","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-25"},{"end":"2013-12-31","val":587240000,"accn":"0000820736-14-000063","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-25"},{"end":"2013-12-31","val":587240000,"accn":"0000820736-14-000073","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-24","frame":"CY2013Q4I"},{"end":"2014-03-31","val":589938000,"accn":"0000820736-14-000039","fy":2014,"fp":"Q1","form":"10-Q","filed":"2014-04-25","frame":"CY2014Q1I"},{"end":"2014-06-30","val":592056000,"accn":"0000820736-14-000063","fy":2014,"fp":"Q2","form":"10-Q","filed":"2014-07-25","frame":"CY2014Q2I"},{"end":"2014-09-30","val":592268000,"accn":"0000820736-14-000073","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-10-24","frame":"CY2014Q3I"}]}},"AdditionsToNoncurrentAssets":{"label":"Segment Reporting Information, Expenditures for Additions to Long-Lived Assets (Deprecated 2013-01-31)","description":"Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.","units":{"USD":[{"start":"2010-01-01","end":"2010-06-30","val":33591000,"accn":"0000820736-11-000050","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-08-29"},{"start":"2010-04-01","end":"2010-06-30","val":18494000,"accn":"0000820736-11-000050","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-08-29","frame":"CY2010Q2"},{"start":"2010-01-01","end":"2010-09-30","val":58682000,"accn":"0000820736-11-000058","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27"},{"start":"2010-07-01","end":"2010-09-30","val":25091000,"accn":"0000820736-11-000058","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27","frame":"CY2010Q3"},{"start":"2011-01-01","end":"2011-06-30","val":32774000,"accn":"0000820736-11-000050","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-08-29"},{"start":"2011-04-01","end":"2011-06-30","val":15458000,"accn":"0000820736-11-000050","fy":2011,"fp":"Q2","form":"10-Q/A","filed":"2011-08-29","frame":"CY2011Q2"},{"start":"2011-01-01","end":"2011-09-30","val":43118000,"accn":"0000820736-11-000058","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27"},{"start":"2011-07-01","end":"2011-09-30","val":10344000,"accn":"0000820736-11-000058","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-10-27","frame":"CY2011Q3"}]}},"AdjustmentsNoncashItemsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesOther":{"label":"Adjustments, 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This element is used when there is not a more specific and appropriate element.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":-4844000,"accn":"0000820736-11-000017","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2008"},{"start":"2009-01-01","end":"2009-12-31","val":-3933000,"accn":"0000820736-11-000017","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2009"},{"start":"2010-01-01","end":"2010-12-31","val":-2113000,"accn":"0000820736-11-000017","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2010"}]}},"AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue":{"label":"APIC, Share-based Payment Arrangement, Increase for Cost Recognition","description":"Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.","units":{"USD":[{"start":"2008-01-01","end":"2008-12-31","val":4788000,"accn":"0000820736-11-000017","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28","frame":"CY2008"},{"start":"2009-01-01","end":"2009-12-31","val":7048000,"accn":"0000820736-12-000022","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29","frame":"CY2009"},{"start":"2009-01-01","end":"2009-12-31","val":7048000,"accn":"0000820736-11-000017","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"start":"2010-01-01","end":"2010-12-31","val":5589000,"accn":"0000820736-13-000011","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22","frame":"CY2010"},{"start":"2010-01-01","end":"2010-12-31","val":5589000,"accn":"0000820736-12-000022","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2010-01-01","end":"2010-12-31","val":5589000,"accn":"0000820736-11-000017","fy":2010,"fp":"FY","form":"10-K","filed":"2011-02-28"},{"start":"2011-01-01","end":"2011-12-31","val":4490000,"accn":"0000820736-14-000017","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2011"},{"start":"2011-01-01","end":"2011-12-31","val":4490000,"accn":"0000820736-13-000011","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2011-01-01","end":"2011-12-31","val":4490000,"accn":"0000820736-12-000022","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-29"},{"start":"2012-01-01","end":"2012-12-31","val":4960000,"accn":"0000820736-14-000017","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2012"},{"start":"2012-01-01","end":"2012-12-31","val":4960000,"accn":"0000820736-13-000011","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-22"},{"start":"2013-01-01","end":"2013-12-31","val":4733000,"accn":"0000820736-14-000017","fy":2013,"fp":"FY","form":"10-K","filed":"2014-02-25","frame":"CY2013"}]}},"AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation":{"label":"Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation","description":"Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). 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