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Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity due within one year $ 1,000 $ 3,994
Held-to-maturity due one year through five years 11 1,023
Held-to-maturity due five years through ten years 6,027 4,031
Held-to-maturity due over ten years 14,261 13,448
Held-to-maturity cost or amortized cost $ 21,299 $ 22,496