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Fair Value - Summary of Carrying and Fair Value Information of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 1,086,444	$ 458,153
Federal funds sold	250	260
Held to maturity securities	10,478,359	10,984,598	$ 10,984,598
Loans held for sale	6,380	5,734
Loans held for investment	20,393,943	20,352,559
Other real estate owned	2,204	1,708
Liabilities
Noninterest-bearing	9,526,535	9,776,572
Interest-bearing	17,648,983	17,403,237
Other borrowings	3,900,000	3,725,000
Securities sold under repurchase agreements	261,671	309,277
Carrying Amount [Member]
Assets
Cash and due from banks	1,086,444	458,153
Federal funds sold	250	260
Held to maturity securities	11,985,838	12,365,308
Loans held for sale	6,380	5,734
Loans held for investment, net of allowance	20,063,724	20,020,197
Loans held for investment	864,924	822,245
Other real estate owned	2,204	1,708
Liabilities
Noninterest-bearing	9,526,535	9,776,572
Interest-bearing	17,648,983	17,403,237
Other borrowings	3,900,000	3,725,000
Securities sold under repurchase agreements	261,671	309,277
Estimated Fair Value [Member]
Assets
Cash and due from banks	1,086,444	458,153
Federal funds sold	250	260
Held to maturity securities	10,478,359	10,984,598
Loans held for sale	6,380	5,734
Loans held for investment, net of allowance	18,465,513	18,321,054
Loans held for investment	864,924	822,245
Other real estate owned	2,204	1,708
Liabilities
Noninterest-bearing	9,526,535	9,776,572
Interest-bearing	17,611,669	17,371,523
Other borrowings	3,876,545	3,725,000
Securities sold under repurchase agreements	261,621	309,245
Estimated Fair Value [Member] | Level 1 [Member]
Assets
Cash and due from banks	1,086,444	458,153
Federal funds sold	250	260
Estimated Fair Value [Member] | Level 2 [Member]
Assets
Held to maturity securities	10,478,359	10,984,598
Loans held for sale	6,380	5,734
Loans held for investment	864,924	822,245
Other real estate owned	2,204	1,708
Liabilities
Noninterest-bearing	9,526,535	9,776,572
Interest-bearing	17,611,669	17,371,523
Other borrowings	3,876,545	3,725,000
Securities sold under repurchase agreements	261,621	309,245
Estimated Fair Value [Member] | Level 3 [Member]
Assets
Loans held for investment, net of allowance	$ 18,465,513	$ 18,321,054

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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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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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Amount, before valuation allowance, of financing receivable classified as held-for-sale.

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Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

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