Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available-for-Sale Securities, Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 20,732
Amortized Cost, After one year through five years	209,735
Amortized Cost, After five years through ten years	105,681
Amortized Cost, After ten years	1,970
Amortized Cost, Total	338,118
Amortized Cost, Mortgage-backed securities	101,068
Amortized Cost	439,186	$ 433,962
Fair Value, One year or less	20,283
Fair Value, After one year through five years	190,333
Fair Value, After five years through ten years	91,379
Fair Value, After ten years	1,867
Fair Value, Total	303,862
Fair Value, Mortgage-backed securities	86,927
Total, Fair Value	$ 390,789	$ 429,931