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Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity due within one year $ 3,994  
Held-to-maturity due one year through five years 1,023 $ 8,369
Held-to-maturity due five years through ten years 4,031 3,127
Held-to-maturity due over ten years 13,448 12,193
Held-to-maturity cost or amortized cost $ 22,496 $ 23,689