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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, 2021
Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]    
Held-to-maturity cost or amortized cost $ 370 $ 451
Held-to-maturity gross unrealized gains 18 30
Held-to-maturity gross unrealized losses (1) (12)
Held-to-maturity fair value $ 387 $ 469