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Commitments, Contingencies and Off-Balance-Sheet Risk - Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate $ 45,709 $ 59,149
Variable Rate 745,948 728,655
Lines of Credit and Construction Loans [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 44,897 58,318
Variable Rate 687,021 668,893
Overdraft Protection [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 10 10
Variable Rate 58,704 59,489
Letters of Credit [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fixed Rate 802 821
Variable Rate $ 223 $ 273