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Securities Held-to-Maturity - Schedule of Unrealized Gains, Losses and Fair Value of Securities Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity cost or amortized cost $ 21,299 $ 22,496
Held-to-maturity gross unrealized gains 9 13
Held-to-maturity gross unrealized losses (1,257) (1,353)
Held-to-maturity fair value $ 20,051 $ 21,156