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Fair Value - Summary of Carrying and Fair Value Information of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Assets    
Cash and due from banks $ 2,209,863 $ 458,153
Federal funds sold 208 260
Held to maturity securities 9,964,060 10,984,598
Loans held for sale 6,113 5,734
Loans held for investment 21,146,033 20,352,559
Other real estate owned 5,757 1,708
Liabilities    
Noninterest-bearing 9,811,361 9,776,572
Interest-bearing 18,276,250 17,403,237
Other borrowings 3,900,000 3,725,000
Securities sold under repurchase agreements 228,896 309,277
Carrying Amount [Member]    
Assets    
Cash and due from banks 2,209,863 458,153
Federal funds sold 208 260
Held to maturity securities 10,969,342 12,365,308
Loans held for sale 6,113 5,734
Loans held for investment, net of allowance 20,791,636 20,020,197
Loans held for investment 1,228,706 822,245
Other real estate owned 5,757 1,708
Liabilities    
Noninterest-bearing 9,811,361 9,776,572
Interest-bearing 18,276,250 17,403,237
Other borrowings 3,900,000 3,725,000
Securities sold under repurchase agreements 228,896 309,277
Estimated Fair Value [Member]    
Assets    
Cash and due from banks 2,209,863 458,153
Federal funds sold 208 260
Held to maturity securities 9,964,060 10,984,598
Loans held for sale 6,113 5,734
Loans held for investment, net of allowance 19,152,919 18,321,054
Loans held for investment 1,228,706 822,245
Other real estate owned 5,757 1,708
Liabilities    
Noninterest-bearing 9,811,361 9,776,572
Interest-bearing 18,258,729 17,371,523
Other borrowings 3,896,912 3,725,000
Securities sold under repurchase agreements 228,876 309,245
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Cash and due from banks 2,209,863 458,153
Federal funds sold 208 260
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Held to maturity securities 9,964,060 10,984,598
Loans held for sale 6,113 5,734
Loans held for investment 1,228,706 822,245
Other real estate owned 5,757 1,708
Liabilities    
Noninterest-bearing 9,811,361 9,776,572
Interest-bearing 18,258,729 17,371,523
Other borrowings 3,896,912 3,725,000
Securities sold under repurchase agreements 228,876 309,245
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Loans held for investment, net of allowance $ 19,152,919 $ 18,321,054