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Fair Value - Summary of Carrying and Fair Value Information of Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets |  |
Cash and due from banks | $ 1,507,604 | $ 458,153
Federal funds sold | 234 | 260
Held to maturity securities | 9,992,366 | 10,984,598
Loans held for sale | 9,951 | 5,734
Loans held for investment | 21,229,461 | 20,352,559
Other real estate owned | 4,960 | 1,708
Liabilities |  |
Noninterest-bearing | 9,706,505 | 9,776,572
Interest-bearing | 18,226,581 | 17,403,237
Other borrowings | 3,900,000 | 3,725,000
Securities sold under repurchase agreements | 233,689 | 309,277
Carrying Amount [Member] |  |
Assets |  |
Cash and due from banks | 1,507,604 | 458,153
Federal funds sold | 234 | 260
Held to maturity securities | 11,383,492 | 12,365,308
Loans held for sale | 9,951 | 5,734
Loans held for investment, net of allowance | 20,869,609 | 20,020,197
Loans held for investment | 1,081,403 | 822,245
Other real estate owned | 4,960 | 1,708
Liabilities |  |
Noninterest-bearing | 9,706,505 | 9,776,572
Interest-bearing | 18,226,581 | 17,403,237
Other borrowings | 3,900,000 | 3,725,000
Securities sold under repurchase agreements | 233,689 | 309,277
Estimated Fair Value [Member] |  |
Assets |  |
Cash and due from banks | 1,507,604 | 458,153
Federal funds sold | 234 | 260
Held to maturity securities | 9,992,366 | 10,984,598
Loans held for sale | 9,951 | 5,734
Loans held for investment, net of allowance | 19,288,895 | 18,321,054
Loans held for investment | 1,081,403 | 822,245
Other real estate owned | 4,960 | 1,708
Liabilities |  |
Noninterest-bearing | 9,706,505 | 9,776,572
Interest-bearing | 18,189,848 | 17,371,523
Other borrowings | 3,883,469 | 3,725,000
Securities sold under repurchase agreements | 233,638 | 309,245
Estimated Fair Value [Member] | Level 1 [Member] |  |
Assets |  |
Cash and due from banks | 1,507,604 | 458,153
Federal funds sold | 234 | 260
Estimated Fair Value [Member] | Level 2 [Member] |  |
Assets |  |
Held to maturity securities | 9,992,366 | 10,984,598
Loans held for sale | 9,951 | 5,734
Loans held for investment | 1,081,403 | 822,245
Other real estate owned | 4,960 | 1,708
Liabilities |  |
Noninterest-bearing | 9,706,505 | 9,776,572
Interest-bearing | 18,189,848 | 17,371,523
Other borrowings | 3,883,469 | 3,725,000
Securities sold under repurchase agreements | 233,638 | 309,245
Estimated Fair Value [Member] | Level 3 [Member] |  |
Assets |  |
Loans held for investment, net of allowance | $ 19,288,895 | $ 18,321,054

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