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Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity due within one year
Held-to-maturity due one year through five years
Held-to-maturity due five years through ten years
Held-to-maturity due over ten years 370 451
Held-to-maturity cost or amortized cost $ 370 $ 451