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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 795
Amortized Cost, Due after one year through five years	34,667
Amortized Cost, Due after five years through ten years	65,215
Amortized Cost, Due after ten years	257,108
Amortized Cost, Mortgage-backed securities	213,462
Amortized Cost, Total securities available for sale	571,247	$ 541,297
Fair Value, Due in one year or less	794
Fair Value, Due after one year through five years	33,381
Fair Value, Due after five years through ten years	63,177
Fair Value, Due after ten years	252,284
Fair Value, Mortgage-backed securities	202,741
Fair Value, Total securities available for sale	$ 552,377	$ 559,874

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