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Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity due one year through five years   $ 2,000
Held-to-maturity due five years through ten years   7,494
Held-to-maturity due over ten years $ 581 7,369
Held-to-maturity cost or amortized cost $ 581 $ 16,863