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Financial Instruments with Off-Balance Sheet Credit Exposures - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Credit Loss [Abstract]          
Allowance for credit losses on OBS credit exposures $ 216,000   $ 216,000   $ 199,000
Provision for credit losses for off-balance sheet $ 47,000 $ (46,000) $ 17,000 $ (96,000)