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LHFI and ACL, LHFI - Change in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period $ 168,237 $ 154,685 $ 160,270 $ 139,367
Loans charged-off (6,775) (7,142) (16,856) (18,586)
Loans charged-off (6,775) (7,142) (16,856) (27,219)
Recoveries 2,390 2,463 6,967 6,821
Net (charge-offs) recoveries (4,385) (4,679) (9,889) (20,398)
PCL, LHFI 1,390 7,923 14,861 38,960
Balance at end of period 165,242 157,929 165,242 157,929
Loans Held for Investment [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
PCL, LHFI 1,390 7,923 14,861 30,327
1-4 Family Mortgage Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Loans charged-off       (8,633)
PCL, LHFI 0 0 0 8,633
Commercial and Industrial Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 28,465 28,735 27,020 26,638
Loans charged-off (3,819) (3,611) (6,249) (4,386)
Recoveries 746 193 1,245 663
PCL, LHFI (293) 7,228 3,083 9,630
Balance at end of period 25,099 32,545 25,099 32,545
Consumer Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 5,111 5,645 5,141 5,794
Loans charged-off (1,968) (2,690) (6,293) (7,622)
Recoveries 1,436 1,496 4,482 4,448
PCL, LHFI 749 1,248 1,998 3,079
Balance at end of period 5,328 5,699 5,328 5,699
State and Other Political Subdivision Loans [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 1,547 625 1,250 646
Loans charged-off 0 0 0 0
Recoveries 0 0 0 0
PCL, LHFI (688) 541 (391) 520
Balance at end of period 859 1,166 859 1,166
Other Commercial Loans and Leases [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 7,451 6,489 6,247 7,072
Loans charged-off (19) 0 (103) (53)
Recoveries 6 0 99 52
PCL, LHFI 922 239 2,117 (343)
Balance at end of period 8,360 6,728 8,360 6,728
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 7,349 5,101 6,452 17,192
Loans charged-off 0 (8) 0 (32)
Recoveries 9 614 205 622
PCL, LHFI (231) 414 470 (11,661)
Balance at end of period 7,127 6,121 7,127 6,121
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 12,665 10,373 11,347 12,942
Loans charged-off (371) (201) (678) (381)
Recoveries 37 55 259 568
PCL, LHFI 812 502 2,215 (2,400)
Balance at end of period 13,143 10,729 13,143 10,729
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 35,017 41,136 37,896 24,043
Loans charged-off (21) 0 (2,026) (2,428)
Recoveries 124 20 124 46
PCL, LHFI (982) (4,869) (1,856) 14,626
Balance at end of period 34,138 36,287 34,138 36,287
Loans Secured by Real Estate [Member] | Other Real Estate Secured [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 23,505 12,037 19,491 4,488
Loans charged-off 0 0 0 0
Recoveries 1 0 78 0
PCL, LHFI 403 1,034 4,340 8,583
Balance at end of period 23,909 13,071 23,909 13,071
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 38,985 30,647 32,129 34,794
Loans charged-off (577) (632) (1,507) (9,823)
Recoveries 29 16 470 81
PCL, LHFI 3,861 1,711 11,206 6,690
Balance at end of period 42,298 31,742 42,298 31,742
Other Loans Secured by Real Estate [Member] | Other Construction [Member]        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 8,142 13,897 13,297 5,758
Loans charged-off 0 0 0 (2,494)
Recoveries 2 69 5 341
PCL, LHFI (3,163) (125) (8,321) 10,236
Balance at end of period $ 4,981 $ 13,841 $ 4,981 $ 13,841