Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available-for-Sale Securities, Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 20,116
Amortized Cost, After one year through five years	238,773
Amortized Cost, After five years through ten years	50,560
Amortized Cost, After ten years	3,882
Amortized Cost, Total	313,331
Amortized Cost, Mortgage-backed securities	95,366
Amortized Cost	408,697	$ 439,186
Fair Value, One year or less	19,736
Fair Value, After one year through five years	213,819
Fair Value, After five years through ten years	44,150
Fair Value, After ten years	3,864
Fair Value, Total	281,569
Fair Value, Mortgage-backed securities	81,656
Total, Fair Value	$ 363,225	$ 390,789