Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Available For Sale Securities Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 17,262
Amortized Cost, After one year through five years	184,900
Amortized Cost, After five years through ten years	131,050
Amortized Cost, After ten years	5,800
Amortized Cost, Total	339,012
Amortized Cost, Mortgage-backed securities	104,242
Amortized Cost	443,254	$ 433,962
Fair Value, One year or less	16,909
Fair Value, After one year through five years	168,802
Fair Value, After five years through ten years	113,882
Fair Value, After ten years	5,628
Fair Value, Total	305,221
Fair Value, Mortgage-backed securities	90,264
Total, Fair Value	$ 395,485	$ 429,931