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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 4,327
Amortized Cost, After one year through five years	167,862
Amortized Cost, After five years through ten years	155,261
Amortized Cost, Total	327,450
Amortized Cost, Mortgage-backed securities	111,516
Amortized Cost	438,966	$ 433,962
Fair Value, One year or less	4,333
Fair Value, After one year through five years	160,778
Fair Value, After five years through ten years	143,825
Fair Value, Total	308,936
Fair Value, Mortgage-backed securities	105,060
Total, Fair Value	$ 413,996	$ 429,931

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