Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Income Taxes [Line Items]
Federal statutory tax rate			21.00%
Income tax expense	$ 15,078,000	$ 11,156,000	$ 28,888,000	$ 22,636,000
Effective tax rates on pre-tax income	18.45%	17.53%	18.41%	17.61%
Initial contribution included in other assets			$ 5,759,000	$ 1,289,000	$ 3,925,000
Additional Contribution Of Property			5,000,000		7,000,000
Leveraged loan, invest in other borrowings	$ 21,053,000		21,053,000
Maximum [Member]
Income Taxes [Line Items]
Initial contribution included in other assets			$ 5,500,000
NMTC Investments [Member]
Income Taxes [Line Items]
Tax Benefit Percent of Qualified Investments			0.39
Investment related liabilities	23,780,000	$ 25,085,000	$ 23,780,000	25,085,000	24,433,000
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