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Receivable from FDIC for Loss Share Agreements (Changes in Receivable from FDIC) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Receivable From FDIC For Loss Share Agreements [Abstract]        
FDIC Indemnification Asset $ 21,340us-gaap_FDICIndemnificationAsset $ 74,784us-gaap_FDICIndemnificationAsset $ 28,701us-gaap_FDICIndemnificationAsset $ 93,397us-gaap_FDICIndemnificationAsset
Receivable From FDIC For Loss Share Agreements [Roll Forward]        
Accretion of discounts and premiums, net (5,031)fcnca_FDICIndemnificationAssetAccretionofDiscountsandPremiumsNet (17,744)fcnca_FDICIndemnificationAssetAccretionofDiscountsandPremiumsNet    
Receipt of payments from FDIC 5,762fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC 3,490fcnca_FDICIndemnificationAssetCashPaymentstofromFDIC    
Post-acquisition and other adjustments, net $ (8,092)fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments $ (4,359)fcnca_FDICIndemnificationAssetPostAcquisitionAdjustments