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Loans and Allowance for Credit Losses - Troubled Debt Restructured Loans and Commitments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]      
Accrual status $ 13,790 $ 14,139 $ 12,584
Nonaccrual status 11,569 12,360 16,952
Total 25,359 26,499 29,536
Unused lines of credit $ 358 $ 3,252 $ 4,120