Loans and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non Accrual Status Of Loans After Number Of Days Past Due	90 days
Loans Receivable Held-for-sale, Amount	$ 271,452	$ 51,991
Charge-offs	(38,366)	(35,428)	$ (33,267)
Unearned Deferred (Fees) Costs on Loans	21,200	14,700
Unearned Premiums	$ (20,200)	(18,900)
Forecasted Value, National Unemployment, Percent	4.35%
Financing Receivable, Allowance for Credit Loss	$ 125,768	118,906	117,718	$ 102,906
Financing Receivable, Nonaccrual	91,756	61,456
US Government Insured Loan Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest		8,100
Financing Receivable, Nonaccrual	$ 31,500
Weighted Average [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Value, National Unemployment, Percent	5.25%
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Value, National Unemployment, Percent	5.56%
Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments related to nonperforming loans	$ 200	300
Loans To Individuals [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non Accrual Status Of Loans After Number Of Days Past Due	150 days
Nonaccrual Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans Receivable Held-for-sale, Amount	$ 0	0
Gain (loss) on sale of impaired loans	0	0	$ 0
SEC Schedule, 12-09, Reserve, Off-balance Sheet Activity [Member] | Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Off-Balance-Sheet, Credit Loss, Liability	$ 0	$ 0