v3.26.1
Fair Value - Summary of Carrying and Fair Value Information of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Assets    
Cash and due from banks $ 1,683,062 $ 1,747,511
Federal funds sold 194 217
Held to maturity securities 11,101,302 9,433,365
Loans held for sale 18,656 14,155
Loans held for investment 23,719,186 20,486,415
Other real estate owned 11,296 13,296
Liabilities    
Noninterest-bearing 10,739,937 9,467,911
Interest-bearing 21,859,750 19,014,573
Other borrowings 2,400,000 1,950,000
Securities sold under repurchase agreements 199,576 201,216
Subordinated notes 70,000  
Carrying Amount [Member]    
Assets    
Cash and due from banks 1,683,062 1,747,511
Federal funds sold 194 217
Held to maturity securities 11,993,057 10,275,228
Loans held for sale 18,656 14,155
Loans held for investment, net of allowance 23,336,345 20,152,673
Loans held for investment 1,290,156 1,304,798
Other real estate owned 11,296 13,296
Liabilities    
Noninterest-bearing 10,739,937 9,467,911
Interest-bearing 21,859,750 19,014,573
Other borrowings 2,400,000 1,950,000
Securities sold under repurchase agreements 199,576 201,216
Subordinated notes 70,000  
Estimated Fair Value [Member]    
Assets    
Cash and due from banks 1,683,062 1,747,511
Federal funds sold 194 217
Held to maturity securities 11,101,302 9,433,365
Loans held for sale 18,656 14,155
Loans held for investment, net of allowance 22,722,420 19,342,602
Loans held for investment 1,290,156 1,304,798
Other real estate owned 11,296 13,296
Liabilities    
Noninterest-bearing 10,739,937 9,467,911
Interest-bearing 21,841,062 19,001,946
Other borrowings 2,400,000 1,950,000
Securities sold under repurchase agreements 199,576 201,216
Subordinated notes 70,000  
Estimated Fair Value [Member] | Level 1 [Member]    
Assets    
Cash and due from banks 1,683,062 1,747,511
Federal funds sold 194 217
Estimated Fair Value [Member] | Level 2 [Member]    
Assets    
Held to maturity securities 11,101,302 9,433,365
Loans held for sale 18,656 14,155
Loans held for investment 1,290,156 1,304,798
Other real estate owned 11,296 13,296
Liabilities    
Noninterest-bearing 10,739,937 9,467,911
Interest-bearing 21,841,062 19,001,946
Other borrowings 2,400,000 1,950,000
Securities sold under repurchase agreements 199,576 201,216
Subordinated notes 70,000  
Estimated Fair Value [Member] | Level 3 [Member]    
Assets    
Loans held for investment, net of allowance $ 22,722,420 $ 19,342,602