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FDIC Loss Sharing Asset and Other Assets - Summary of Activity Related to FDIC Loss Sharing Asset (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Other Assets [Line Items]    
Balance, beginning of period $ 59,453 $ 101,461
FDIC share of additional losses, net of recoveries 1,111 7,639
Cash received from FDIC (18,974) (42,179)
Net Accretion (23,027) (7,468)
Other reductions, net (74)  
Balance, end of period $ 18,489 $ 59,453