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Fair Value - Summary of Carrying and Fair Value Information of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Assets    
Cash and due from banks $ 1,694,637 $ 1,972,175
Federal funds sold 221 292
Held to maturity securities 9,302,604 9,382,479
Loans held for sale 9,764 10,690
Loans held for investment 20,909,913 21,057,616
Other real estate owned 8,012 5,701
Liabilities    
Noninterest-bearing 9,675,915 9,798,438
Interest-bearing 18,350,884 18,582,900
Other borrowings 2,700,000 3,200,000
Securities sold under repurchase agreements 216,086 221,913
Carrying Amount [Member]    
Assets    
Cash and due from banks 1,694,637 1,972,175
Federal funds sold 221 292
Held to maturity securities 10,456,886 10,757,464
Loans held for sale 9,764 10,690
Loans held for investment, net of allowance 20,560,812 20,705,811
Loans held for investment 1,057,893 1,080,903
Other real estate owned 8,012 5,701
Liabilities    
Noninterest-bearing 9,675,915 9,798,438
Interest-bearing 18,350,884 18,582,900
Other borrowings 2,700,000 3,200,000
Securities sold under repurchase agreements 216,086 221,913
Estimated Fair Value [Member]    
Assets    
Cash and due from banks 1,694,637 1,972,175
Federal funds sold 221 292
Held to maturity securities 9,302,604 9,382,479
Loans held for sale 9,764 10,690
Loans held for investment, net of allowance 19,286,068 19,379,556
Loans held for investment 1,057,893 1,080,903
Other real estate owned 8,012 5,701
Liabilities    
Noninterest-bearing 9,675,915 9,798,438
Interest-bearing 18,328,195 18,559,227
Other borrowings 2,700,000 3,200,000
Securities sold under repurchase agreements 216,082 221,902
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Cash and due from banks 1,694,637 1,972,175
Federal funds sold 221 292
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Held to maturity securities 9,302,604 9,382,479
Loans held for sale 9,764 10,690
Loans held for investment 1,057,893 1,080,903
Other real estate owned 8,012 5,701
Liabilities    
Noninterest-bearing 9,675,915 9,798,438
Interest-bearing 18,328,195 18,559,227
Other borrowings 2,700,000 3,200,000
Securities sold under repurchase agreements 216,082 221,902
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Loans held for investment, net of allowance $ 19,286,068 $ 19,379,556