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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Parenthetical) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Jul. 12, 2016
Dec. 31, 2015
Sep. 30, 2015
Jul. 01, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 14,524 $ 14,226 $ 14,534 $ 16,168 $ 16,421 $ 16,501
Loans Purchased With Evidence of Credit Deterioration [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for loan losses $ 0   $ 63