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Covered Assets and FDIC Loss Sharing Asset - Summary of Activity Related to FDIC Loss Sharing Asset (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Covered Assets And Fdic Loss Sharing Asset [Abstract]    
Balance, beginning of period $ 18,489 $ 59,453
FDIC share of additional losses, net of recoveries (81) 1,111
Cash received from FDIC, net of refund (4) (18,974)
Net amortization (12,779) (23,027)
Other reductions, net (861) (74)
Balance, end of period $ 4,764 $ 18,489