Annual report pursuant to Section 13 and 15(d)

Qualified Affordable Housing Project Investments - Additional Information (Detail)

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Qualified Affordable Housing Project Investments - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Investments in Affordable Housing Projects [Line Items]      
Qualified affordable housing project investments $ 5,900,000 $ 8,000,000.0  
Unfunded commitments related to investments $ 27,000 56,000  
Investment commitments expected to be paid 2023    
Income Tax Expense      
Investments in Affordable Housing Projects [Line Items]      
Qualified affordable housing project investments, amortization expense recognized $ 1,900,000 $ 1,900,000 $ 1,800,000