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FDIC Indemnification Asset (Changes in Receivable from FDIC) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
FDIC Indemnification Asset [Roll Forward]      
Beginning balance $ 93,397us-gaap_FDICIndemnificationAsset $ 270,192us-gaap_FDICIndemnificationAsset $ 617,377us-gaap_FDICIndemnificationAsset
Additional receivable from acquisition 5,106fcnca_AdditionstoIndemnificationAssetDuringPeriod 0fcnca_AdditionstoIndemnificationAssetDuringPeriod 0fcnca_AdditionstoIndemnificationAssetDuringPeriod
Accretion of discounts and premiums, net (43,422)fcnca_FDICIndemnificationAssetAmortizationofDiscountsandPremiumsNet (85,651)fcnca_FDICIndemnificationAssetAmortizationofDiscountsandPremiumsNet (102,394)fcnca_FDICIndemnificationAssetAmortizationofDiscountsandPremiumsNet
Receipt of payments from FDIC 1,286fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC (19,373)fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC (251,972)fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC
Post-acquisition and other adjustments, net (27,666)fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments (71,771)fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments 7,181fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments
Ending balance $ 28,701us-gaap_FDICIndemnificationAsset $ 93,397us-gaap_FDICIndemnificationAsset $ 270,192us-gaap_FDICIndemnificationAsset