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Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans and Commitments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Loans and Leases Receivable Disclosure [Abstract]      
Accrual status $ 14,139 $ 12,584 $ 13,495
Nonaccrual status 12,360 16,952 16,980
Total 26,499 29,536 30,475
Unused lines of credit $ 3,252 $ 4,120 $ 452