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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
Jun. 30, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity cost or amortized cost $ 20,229 $ 21,299
Held-to-maturity gross unrealized gains 5 9
Held-to-maturity gross unrealized losses (1,950) (1,257)
Held-to-maturity fair value $ 18,284 $ 20,051