Loans and Allowance for Credit Losses - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Contract	Dec. 31, 2021 USD ($) Contract	Dec. 31, 2020 USD ($) Contract
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	$ 11,869	$ 18,583
Provision for credit losses	17,521	(377)	$ 53,472
Charge-offs	9,845	13,058	$ 19,250
Recorded Investment	$ 35,487	$ 55,180
Number of loans modified | Contract	5	30	41
Total amount of loan modified	$ 676	$ 1,690	$ 13,969
Total gains or losses included in earnings		0
Loans with modification to rate and payment due to amortization	$ 10	400	800
Minimum days required for conversion of trouble debt to be in default	90 days
Unearned Deferred (Fees) Costs on Loans	$ 5,900	800
Unearned Premiums	(5,400)	(6,000)
Loans	7,642,143	6,839,230
Loans and Leases Receivable, Gross	$ 7,642,143	6,839,230
Forecasted Value, National Unemployment, Percent	3.68%
Weighted Average [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Value, National Unemployment, Percent	4.68%
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Forecasted Value, National Unemployment, Percent	5.01%
Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded commitments related to nonperforming loans	$ 200	200
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	400	$ 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
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,211,706	1,173,452
Loans and Leases Receivable, Gross	1,211,706	1,173,452
Commercial Loan [Member] | Payroll Protection Program Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 4,300	$ 71,300