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LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period $ 160,270 $ 139,367 $ 120,214
Loans charged-off (26,748) (26,316) (17,515)
Loans charged-off (26,748) (34,949)  
Recoveries 9,238 9,932 9,306
Net (charge-offs) recoveries (17,510) (25,017) (8,209)
PCL, LHFI 14,311 45,920  
Balance at end of period 157,071 160,270 139,367
Loans Held for Investment [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
PCL, LHFI 14,311 37,287 27,362
1-4 Family Mortgage Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Loans charged-off 0 (8,633) 0
PCL, LHFI 0 8,633 0
Commercial and Industrial Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 27,020 26,638  
Loans charged-off (13,013) (9,048)  
Recoveries 1,715 963  
PCL, LHFI 4,847 8,467  
Balance at end of period 20,569 27,020 26,638
Consumer Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 5,141 5,794  
Loans charged-off (8,438) (9,817)  
Recoveries 6,077 6,187  
PCL, LHFI 3,063 2,977  
Balance at end of period 5,843 5,141 5,794
State and Other Political Subdivision Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 1,250 646  
Loans charged-off 0 0  
Recoveries 0 0  
PCL, LHFI (385) 604  
Balance at end of period 865 1,250 646
Other Commercial Loans and Leases [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 6,247 7,072  
Loans charged-off (220) (95)  
Recoveries 113 65  
PCL, LHFI 1,869 (795)  
Balance at end of period 8,009 6,247 7,072
Loans Secured by Real Estate [Member] | Construction, Land Development and Other Land [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 6,452 17,192  
Loans charged-off 0 (32)  
Recoveries 225 1,024  
PCL, LHFI (45) (11,732)  
Balance at end of period 6,632 6,452 17,192
Loans Secured by Real Estate [Member] | Other Secured by 1-4 Family Residential Properties [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 11,347 12,942  
Loans charged-off (936) (512)  
Recoveries 325 672  
PCL, LHFI 2,848 (1,755)  
Balance at end of period 13,584 11,347 12,942
Loans Secured by Real Estate [Member] | Secured by Nonfarm, Nonresidential Properties [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 37,896 24,043  
Loans charged-off (2,026) (2,545)  
Recoveries 159 154  
PCL, LHFI (846) 16,244  
Balance at end of period 35,183 37,896 24,043
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 19,491 4,488  
Loans charged-off (4) (89)  
Recoveries 78 1  
PCL, LHFI 845 15,091  
Balance at end of period 20,410 19,491 4,488
Other Loans Secured by Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 32,129 34,794  
Loans charged-off (2,111) (10,304)  
Recoveries 511 152  
PCL, LHFI 10,558 7,487  
Balance at end of period 41,087 32,129 34,794
Other Loans Secured by Real Estate [Member] | Other Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Balance at beginning of period 13,297 5,758  
Loans charged-off 0 (2,507)  
Recoveries 35 714  
PCL, LHFI (8,443) 9,332  
Balance at end of period $ 4,889 $ 13,297 $ 5,758