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Bank Premises and Equipment - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 16,813,000 $ 15,709,000 $ 17,191,000
Amortization expense $ 328,000 $ 310,000 $ 310,000