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Commitments and Contingencies - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Other Commitments [Line Items]          
Outstanding loan commitments $ 243,600,000   $ 243,600,000   $ 283,200,000
Cancellable amounts 35,500,000   35,500,000   32,900,000
Outstanding stand-by letters of credit 9,500,000   9,500,000   12,500,000
Provision for credit losses for unfunded commitments 0   0    
Gain on sale of MSRs 737,000 $ (1,011,000) 1,026,000 $ (1,011,000)  
Future commitments outstanding related to investments 5,200,000   5,200,000   7,100,000
MSR Assets [Member]          
Other Commitments [Line Items]          
Reserve 600,000   600,000   1,800,000
Other Liabilities [Member]          
Other Commitments [Line Items]          
Reserves for unfunded commitments to borrowers $ 900,000   $ 900,000   $ 900,000