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Loans and Allowance for Loan Losses - Summary of Non-Performing Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Troubled debt restructurings $ 39,539 $ 39,920
Non-Performing [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual loans 65,451 66,004
Troubled debt restructurings 17,252 14,876
Total non-performing loans 82,703 80,880
Other real estate owned (OREO) 35,144 35,257
Total non-performing loans and OREO 117,847 116,137
Non-performing investments 733 2,809
Total non-performing assets $ 118,580 $ 118,946
Non-performing loans as a percent of total loans 0.94% 0.99%
Non-performing loans + OREO as a percent of total loans + OREO 1.33% 1.42%
Non-performing assets as a percent of total assets 0.93% 0.99%