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Business Combinations (Summary of FDIC Indemnification Asset) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
FDIC Indemnification Asset [Roll Forward]    
Balance at beginning of period $ 11,846us-gaap_FDICIndemnificationAsset $ 85,672us-gaap_FDICIndemnificationAsset
Additions from acquisitions 0us-gaap_FDICIndemnificationAssetAcquisitions 0us-gaap_FDICIndemnificationAssetAcquisitions
Additions from reimbursable expenses 1,575us-gaap_FDICIndemnificationAssetAdditionalEstimatedLosses 1,282us-gaap_FDICIndemnificationAssetAdditionalEstimatedLosses
Amortization (1,260)us-gaap_FDICIndemnificationAssetAccretionOfDiscount (1,603)us-gaap_FDICIndemnificationAssetAccretionOfDiscount
Changes in expected reimbursements from the FDIC for changes in expected credit losses (3,993)us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease (15,384)us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease
Payments provided to (received from) the FDIC (2,056)us-gaap_FDICIndemnificationAssetCashPaymentsReceived 9,669us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Balance at end of period $ 10,224us-gaap_FDICIndemnificationAsset $ 60,298us-gaap_FDICIndemnificationAsset