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Fair Value - Summary of Carrying and Fair Value Information of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Assets    
Cash and due from banks $ 1,766,115 $ 1,972,175
Federal funds sold 210 292
Held to maturity securities 8,981,672 9,382,479
Loans held for sale 11,297 10,690
Loans held for investment 20,738,294 21,057,616
Other real estate owned 13,750 5,701
Liabilities    
Noninterest-bearing 9,522,028 9,798,438
Interest-bearing 18,260,066 18,582,900
Other borrowings 2,400,000 3,200,000
Securities sold under repurchase agreements 185,797 221,913
Carrying Amount [Member]    
Assets    
Cash and due from banks 1,766,115 1,972,175
Federal funds sold 210 292
Held to maturity securities 9,900,093 10,757,464
Loans held for sale 11,297 10,690
Loans held for investment, net of allowance 20,398,668 20,705,811
Loans held for investment 1,278,178 1,080,903
Other real estate owned 13,750 5,701
Liabilities    
Noninterest-bearing 9,522,028 9,798,438
Interest-bearing 18,260,066 18,582,900
Other borrowings 2,400,000 3,200,000
Securities sold under repurchase agreements 185,797 221,913
Estimated Fair Value [Member]    
Assets    
Cash and due from banks 1,766,115 1,972,175
Federal funds sold 210 292
Held to maturity securities 8,981,672 9,382,479
Loans held for sale 11,297 10,690
Loans held for investment, net of allowance 19,388,969 19,379,556
Loans held for investment 1,278,178 1,080,903
Other real estate owned 13,750 5,701
Liabilities    
Noninterest-bearing 9,522,028 9,798,438
Interest-bearing 18,243,056 18,559,227
Other borrowings 2,400,000 3,200,000
Securities sold under repurchase agreements 185,796 221,902
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Cash and due from banks 1,766,115 1,972,175
Federal funds sold 210 292
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Held to maturity securities 8,981,672 9,382,479
Loans held for sale 11,297 10,690
Loans held for investment 1,278,178 1,080,903
Other real estate owned 13,750 5,701
Liabilities    
Noninterest-bearing 9,522,028 9,798,438
Interest-bearing 18,243,056 18,559,227
Other borrowings 2,400,000 3,200,000
Securities sold under repurchase agreements 185,796 221,902
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Loans held for investment, net of allowance $ 19,388,969 $ 19,379,556