v3.26.1
LHFI and ACL, LHFI - Loan Portfolio Held for Investment (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Loan Portfolio [Abstract]        
Total LHFI $ 13,877,971 $ 13,674,233    
Less ACL, LHFI 160,431 157,071 $ 167,010 $ 160,270
Net LHFI 13,717,540 13,517,162    
Construction, Land Development and Other Land [Member] | Loans Secured by Real Estate [Member]        
Loan Portfolio [Abstract]        
Total LHFI 560,143 549,353    
Other Secured by 1-4 Family Residential Properties [Member] | Loans Secured by Real Estate [Member]        
Loan Portfolio [Abstract]        
Total LHFI 712,532 704,514    
Secured by 1-4 Family Residential Properties [Member] | Other Loans Secured by Real Estate [Member]        
Loan Portfolio [Abstract]        
Total LHFI 2,347,195 2,351,675    
Other Real Estate Secured [Member] | Loans Secured by Real Estate [Member]        
Loan Portfolio [Abstract]        
Total LHFI 2,079,222 2,124,272    
Other Construction [Member] | Other Loans Secured by Real Estate [Member]        
Loan Portfolio [Abstract]        
Total LHFI 645,555 595,238    
Secured by Nonfarm, Nonresidential Properties [Member] | Loans Secured by Real Estate [Member]        
Loan Portfolio [Abstract]        
Total LHFI 3,289,115 3,304,523    
Less ACL, LHFI 31,093 35,183 39,973 37,896
Commercial and Industrial Loans [Member]        
Loan Portfolio [Abstract]        
Total LHFI 2,166,425 1,999,464    
Less ACL, LHFI 24,800 20,569 25,396 27,020
Consumer Loans [Member]        
Loan Portfolio [Abstract]        
Total LHFI 159,443 163,754    
Less ACL, LHFI 6,137 5,843 5,238 5,141
State and Other Political Subdivision Loans [Member]        
Loan Portfolio [Abstract]        
Total LHFI 1,059,624 1,061,584    
Less ACL, LHFI 773 865 1,605 1,250
Other Commercial Loans and Leases [Member]        
Loan Portfolio [Abstract]        
Total LHFI 858,717 819,856    
Less ACL, LHFI $ 9,063 $ 8,009 $ 6,530 $ 6,247