Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Income Taxes [Line Items]
Federal statutory tax rate			21.00%
Income tax expense	$ 11,156,000	$ 11,754,000	$ 22,636,000	$ 23,442,000
Effective tax rates on pre-tax income	17.53%	18.77%	17.61%	18.48%
Initial capital contribution commitment			$ 5,500,000
Initial contribution included in other assets			1,289,000	$ 218,000	$ 615,000
Leveraged loan, invest in other borrowings	$ 21,053,000		$ 21,053,000
NMTC Investments [Member]
Income Taxes [Line Items]
Tax Benefit Percent of Qualified Investments			0.39
Investment related liabilities	25,085,000	$ 26,281,000	$ 25,085,000	26,281,000	25,738,000
FFB Paris Investment Fund, LLC [Member]
Income Taxes [Line Items]
Loan investment	18,000,000	18,000,000	18,000,000	18,000,000	18,000,000
Leveraged loan, invest in other borrowings	$ 21,053,000	$ 21,053,000	$ 21,053,000	$ 21,053,000	$ 21,053,000