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Fair Value - Summary of Carrying Values and Estimated Fair Values of Financial Instruments on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Assets    
Cash and due from banks $ 458,153 $ 423,832
Federal funds sold 260 301
Held to maturity securities 10,984,598 12,387,125
Loans held for sale 5,734 554
Loans held for investment 20,352,559 18,098,653
Other real estate owned 1,708 1,963
Liabilities    
Noninterest-bearing 9,776,572 10,915,448
Interest-bearing 17,403,237 17,618,083
Other borrowings 3,725,000 1,850,000
Securities sold under repurchase agreements 309,277 428,134
Carrying Amount [Member]    
Assets    
Cash and due from banks 458,153 423,832
Federal funds sold 260 301
Held to maturity securities 12,365,308 14,019,503
Loans held for sale 5,734 554
Loans held for investment, net of allowance 20,020,197 17,817,077
Other real estate owned 1,708 1,963
Liabilities    
Noninterest-bearing 9,776,572 10,915,448
Interest-bearing 17,403,237 17,618,083
Other borrowings 3,725,000 1,850,000
Securities sold under repurchase agreements 309,277 428,134
Carrying Amount [Member] | Warehouse Purchase Program [Member]    
Assets    
Loans held for investment 822,245 740,620
Estimated Fair Value [Member]    
Assets    
Cash and due from banks 458,153 423,832
Federal funds sold 260 301
Held to maturity securities 10,984,598 12,387,125
Loans held for sale 5,734 554
Loans held for investment, net of allowance 18,321,054 17,550,309
Other real estate owned 1,708 1,963
Liabilities    
Noninterest-bearing 9,776,572 10,915,448
Interest-bearing 17,371,523 17,563,711
Other borrowings 3,725,000 1,850,000
Securities sold under repurchase agreements 309,245 428,061
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Cash and due from banks 458,153 423,832
Federal funds sold 260 301
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Held to maturity securities 10,984,598 12,387,125
Loans held for sale 5,734 554
Other real estate owned 1,708 1,963
Liabilities    
Noninterest-bearing 9,776,572 10,915,448
Interest-bearing 17,371,523 17,563,711
Other borrowings 3,725,000 1,850,000
Securities sold under repurchase agreements 309,245 428,061
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Loans held for investment, net of allowance 18,321,054 17,550,309
Estimated Fair Value [Member] | Warehouse Purchase Program [Member]    
Assets    
Loans held for investment 822,245 740,620
Estimated Fair Value [Member] | Warehouse Purchase Program [Member] | Level 2 [Member]    
Assets    
Loans held for investment $ 822,245 $ 740,620