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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Investments In Affordable Housing Projects [Abstract]          
Investment for qualified affordable housing projects included in other assets $ 12,377,000   $ 12,377,000   $ 13,093,000
Unfunded commitments related to the investments in qualified affordable housing projects 4,093,000   4,093,000   $ 5,706,000
Recognized amortization expense 239,000 $ 203,000 716,000 $ 608,000  
Recognized tax credits and other benefits from its investment in affordable housing tax credits 396,000 339,000 1,181,000 1,015,000  
Impairment losses related to its investments in qualified affordable housing projects $ 0 $ 0 $ 0 $ 0