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Securities - Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Available-for-Sale Securities, Debt Maturities [Abstract]    
Amortized Cost, One year or less $ 46,191  
Amortized Cost, After one year through five years 255,064  
Amortized Cost, After five years through ten years 21,268  
Amortized Cost, After ten years 1,404  
Amortized Cost, Total 323,927  
Amortized Cost, Mortgage-backed securities 105,479  
Amortized Cost 429,406 $ 395,203
Fair Value, One year or less 45,568  
Fair Value, After one year through five years 241,067  
Fair Value, After five years through ten years 20,144  
Fair Value, After ten years 1,409  
Fair Value, Total 308,188  
Fair Value, Mortgage-backed securities 96,693  
Total, Fair Value $ 404,881 $ 358,478