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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
Investments, Debt and Equity Securities [Abstract]    
Amortized Cost, Due in one year or less $ 5,975  
Amortized Cost, Due after one year through five years 89,919  
Amortized Cost, Due after five years through ten years 43,180  
Amortized Cost, Due after ten years 288,513  
Amortized Cost, Mortgage-backed securities 244,078  
Amortized Cost, Total securities available for sale 671,665 $ 672,892
Fair Value, Due in one year or less 5,972  
Fair Value, Due after one year through five years 85,907  
Fair Value, Due after five years through ten years 42,988  
Fair Value, Due after ten years 272,136  
Fair Value, Mortgage-backed securities 219,785  
Fair Value, Total securities available for sale $ 626,788 $ 618,272