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Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity due within one year $ 3,997 $ 3,994
Held-to-maturity due one year through five years 1,020 1,023
Held-to-maturity due five years through ten years 4,030 4,031
Held-to-maturity due over ten years 14,155 13,448
Held-to-maturity cost or amortized cost $ 23,202 $ 22,496