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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