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Loans and Allowance for Credit Losses - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Accounts Notes And Loans Receivable [Line Items]
Percentage of Loans Related to Single Industry on Loans	10.00%		10.00%
Percentage of real estate loans aggregating to company loan portfolio, excluding Warehouse Purchase Program loans	82.30%		83.00%
Loans and Leases Receivable, Related Parties	$ 290,000		$ 292,000	$ 547,000
Loans held for investment	$ 20,393,943,000		$ 20,352,559,000
Financing Receivable Ratio of Nonperforming Loans to All Loans and Other Real Estate	0.39%		0.34%
Loans and leases receivable, nonaccrual loans	$ 78,500,000		$ 68,700,000
Financing Receivable, Allowance for Credit Losses on Loans	$ 330,200,000		$ 332,400,000
Allowance for Credit Losses as Percentage of Loans	1.55%		1.57%
Provision for credit losses	$ 0	$ 0
Decrease in allowance for credit losses for loans	$ (2,100,000)
Decrease in allowance for credit losses for loans, percentage	(0.60%)
Net (charge-offs) recoveries	$ (2,143,000)	$ 615,000
General reserve	4,100,000
Allowance for credit losses on off-balance sheet credit exposures	36,503,000		$ 36,503,000
Commitments expected to fund	2,260,000,000
Nonaccrual loans	78,475,000		68,688,000
PCD Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Net (charge-offs) recoveries	(991,000)
Nonperforming Financial Instruments [Member]
Accounts Notes And Loans Receivable [Line Items]
Loans held for investment	$ 83,800,000		$ 72,700,000

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Allowance for credit losses as percentage of loans.

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Financing receivable ratio of nonperforming loans to all loans and other real estate.

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Increase decrease in allowance for credit losses percent.

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Percentage of loans related to single industry on total loans.

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Percentage of multiple industry loans aggregating to company loan portfolio excluding Warehouse Purchase Program loans.

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Provision for credit losses.

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Amount, after recoveries, of loans and leases that have been written-off.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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