Investment Securities - Schedule of Investment Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 20,349	$ 22,520
Gross Unrealized Gains	795	1,058
Fair Value	21,144	23,578
Tax-Exempt Municipal Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	17,849	20,015
Gross Unrealized Gains	795	1,058
Fair Value	18,644	21,073
Subordinated Debt [Member]
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	2,500	2,505
Fair Value	$ 2,500	$ 2,505