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Deposits - Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]    
Demand deposits $ 226,971 $ 197,062
Savings accounts 123,749 107,829
Negotiable order of withdrawal accounts 454,487 445,967
Money market demand accounts 628,321 523,895
Certificates of deposit $250,000 or greater 64,938 64,236
Other certificates of deposit 360,871 364,274
Individual retirement accounts $250,000 or greater 8,417 9,074
Other individual retirement accounts 74,381 77,513
Deposits $ 1,942,135 $ 1,789,850