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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 988
Amortized Cost, Due after one year through five years	36,600
Amortized Cost, Due after five years through ten years	62,564
Amortized Cost, Due after ten years	273,013
Amortized Cost, Mortgage-backed securities	208,991
Amortized Cost, Total securities available for sale	582,156	$ 541,297
Fair Value, Due in one year or less	980
Fair Value, Due after one year through five years	34,414
Fair Value, Due after five years through ten years	58,238
Fair Value, Due after ten years	249,391
Fair Value, Mortgage-backed securities	187,794
Fair Value, Total securities available for sale	$ 530,817	$ 559,874

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