Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Contingency [Line Items]
Federal statutory tax rate	21.00%	21.00%	21.00%
Deferred tax amounts, valuation allowance recorded	$ 0	$ 0
Uncertain tax positions	0	0
Initial capital contribution commitment	5,500,000
Initial contribution included in other assets	$ 615,000	131,000
NMTC investments [Member]
Income Tax Contingency [Line Items]
Tax Cuts and Jobs Act, Measurement Period Adjustment, Increase (Decrease) in Effective Tax Rate	39.00%
Investments in other assets	$ 25,738,000	26,825,000
FFB Paris Investment Fund, LLC [Member]
Income Tax Contingency [Line Items]
Loan investment	18,000,000	18,000,000
Leveraged loan, invest in other borrowings	$ 21,053,000	$ 21,053,000