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, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments in Affordable Housing Projects [Line Items]      
Qualified affordable housing project investments $ 16,600,000 $ 5,900,000  
Unfunded commitments related to investments $ 10,000,000 27,000  
Investment commitments expected to be paid 2024 2025 2026 2027 2028    
Income Tax Expense      
Investments in Affordable Housing Projects [Line Items]      
Qualified affordable housing project investments, amortization expense recognized $ 1,900,000 $ 1,900,000 $ 1,900,000