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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 9,413
Amortized Cost, After one year through five years	149,169
Amortized Cost, After five years through ten years	156,830
Amortized Cost, Total	315,412
Amortized Cost, Mortgage-backed securities	118,550
Amortized Cost	433,962	$ 300,602
Fair Value, One year or less	9,458
Fair Value, After one year through five years	148,405
Fair Value, After five years through ten years	154,141
Fair Value, Total	312,004
Fair Value, Mortgage-backed securities	117,927
Total, Fair Value	$ 429,931	$ 307,812

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