Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax at statutory rate, Amount	$ 40,185	$ 37,424	$ 41,487
Tax credits, Amount	$ (294)	$ (354)	$ (381)
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Percent	0.00%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Other, Amount	$ 10	$ 4	$ 38
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Percent	0.00%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount	$ (900)	$ (835)	$ (812)
Other, Amount	(125)	(509)	(125)
Total tax provision (benefit), Amount	$ 39,056	$ 35,636	$ 40,492
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax at statutory rate, Pretax Income	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	$ 1,030	$ 793	$ 725
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.00%	0.00%	0.00%
Tax credits, Pretax Income	0.00%	0.00%	0.00%
Other, Pretax Income	0.00%	0.00%	0.00%
Total tax provision (benefit), Pretax Income	21.00%	20.00%	20.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	$ (1,444)	$ (1,336)	$ (1,024)
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	(1.00%)	(1.00%)	(1.00%)
Effective Income Tax Rate Reconciliation, Deduction, Other, Percent	0.00%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount	$ 614	$ 457	$ 660