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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Available-for-Sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 17,092  
Amortized Cost, After one year through five years 249,459  
Amortized Cost, After five years through ten years 35,451  
Amortized Cost, After ten years 3,883  
Amortized Cost, Total 305,885  
Amortized Cost, Mortgage-backed securities 92,356  
Amortized Cost 398,241 $ 439,186
Fair Value, One year or less 16,708  
Fair Value, After one year through five years 220,779  
Fair Value, After five years through ten years 30,574  
Fair Value, After ten years 3,714  
Fair Value, Total 271,775  
Fair Value, Mortgage-backed securities 76,480  
Total, Fair Value $ 348,255 $ 390,789