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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Available-for-Sale Securities, Debt Maturities [Abstract]
Amortized Cost, One year or less	$ 50,842
Amortized Cost, After one year through five years	256,807
Amortized Cost, After five years through ten years	17,057
Amortized Cost, After ten years	510
Amortized Cost, Total	325,216
Amortized Cost, Mortgage-backed securities	133,268
Amortized Cost	458,484	$ 395,203
Fair Value, One year or less	50,047
Fair Value, After one year through five years	239,570
Fair Value, After five years through ten years	15,811
Fair Value, After ten years	497
Fair Value, Total	305,925
Fair Value, Mortgage-backed securities	120,631
Total, Fair Value	$ 426,556	$ 358,478

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