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Securities - Amortized Cost and Fair Value of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Investments Debt And Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 1,500
Amortized Cost, Due after one year through five years	47,323
Amortized Cost, Due after five years through ten years	72,996
Amortized Cost, Due after ten years	288,605
Amortized Cost, Mortgage-backed securities	272,950
Amortized Cost, Total securities available for sale	683,374	$ 541,297
Fair Value, Due in one year or less	1,490
Fair Value, Due after one year through five years	43,934
Fair Value, Due after five years through ten years	66,744
Fair Value, Due after ten years	246,184
Fair Value, Mortgage-backed securities	243,694
Fair Value, Total securities available for sale	$ 602,046	$ 559,874

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