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Non-Covered Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Activity Related to Troubled Debt Restructurings (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Performing TDRs [Member]
    
Financing Receivable, Modifications [Line Items]    
Beginning balance $ 50,392 $ 38,554
New modifications 30,796 24,339
Payoffs and payments, net (15,492) (8,536)
TDRs returned to accrual status 1,259 1,215
TDRs placed on nonaccrual status   (5,180)
Ending balance 66,955 50,392
Nonperforming TDRs [Member]
    
Financing Receivable, Modifications [Line Items]    
Beginning balance 31,309 23,844
New modifications 4,187 18,094
Charge-offs (92) (19)
Transfer to OREO   (4,897)
Payoffs and payments, net (9,026) (9,678)
TDRs returned to accrual status (1,259) (1,215)
TDRs placed on nonaccrual status   5,180
Ending balance $ 25,119 $ 31,309