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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance $ 118,906 $ 117,718 $ 102,906
Ending Balance 125,768 118,906 117,718
Financing receivable, before allowance for credit loss 9,508,039 8,983,754  
Financing Receivable, Allowance for Credit Loss, Writeoff (38,366) (35,428) (33,267)
Recoveries 8,991 4,248 3,115
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 32,677 32,368 17,759
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 3,560   27,205
Time and demand loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,226,054 1,133,595  
Financing Receivable, Allowance for Credit Loss, Writeoff (16,182) (11,131)  
Recoveries 4,223 435  
Commercial credit cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 11,408 11,718  
Financing Receivable, Allowance for Credit Loss, Writeoff (302) (251)  
Recoveries 35 6  
Senior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,631,019 1,670,547  
Financing Receivable, Allowance for Credit Loss, Writeoff (501) (191)  
Recoveries 66 168  
Junior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 729,266 671,156  
Financing Receivable, Allowance for Credit Loss, Writeoff (244) (292)  
Recoveries 168 202  
Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 594,790 597,145  
Financing Receivable, Allowance for Credit Loss, Writeoff (766) 0  
Recoveries 0 0  
Nonowner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,834,016 1,804,950  
Financing Receivable, Allowance for Credit Loss, Writeoff (4,770) (7,138)  
Recoveries 148 59  
Owner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 753,303 722,609  
Financing Receivable, Allowance for Credit Loss, Writeoff (1,652) (1,540)  
Recoveries 69 118  
Consumer Credit Cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 9,496 9,865  
Financing Receivable, Allowance for Credit Loss, Writeoff (346) (428)  
Recoveries 79 96  
Other consumer loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 61,179 65,464  
Financing Receivable, Allowance for Credit Loss, Writeoff (1,516) (1,624)  
Recoveries 351 376  
Equipment Finance      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 693,265 427,320  
Financing Receivable, Allowance for Credit Loss, Writeoff (2,288) (2,020)  
Recoveries 626 174  
Time and Demand Loans Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 114,262 105,356  
Financing Receivable, Allowance for Credit Loss, Writeoff (1,480) (2,110)  
Recoveries 234 198  
Construction Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 415,536 475,367  
Financing Receivable, Allowance for Credit Loss, Writeoff (732) (1,092)  
Recoveries 0 6  
Construction Residential      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 47,250 8,017  
Financing Receivable, Allowance for Credit Loss, Writeoff (562) 0  
Recoveries 0 0  
Automobile Loan      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,387,195 1,280,645  
Financing Receivable, Allowance for Credit Loss, Writeoff (7,025) (7,611)  
Recoveries 2,992 2,410  
Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 29,131 27,996 22,650
Ending Balance 38,149 29,131 27,996
Financing Receivable, Allowance for Credit Loss, Writeoff (20,252) (15,512) (19,199)
Recoveries 5,118 813 498
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 22,536 15,834 4,630
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1,616   19,417
Commercial, financial, agricultural and other [Member] | Time and demand loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 19,433 22,819  
Ending Balance 22,223 19,433 22,819
Financing Receivable, Allowance for Credit Loss, Writeoff (16,182) (11,131)  
Recoveries 4,223 435  
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 13,133 7,310  
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1,616   19,417
Commercial, financial, agricultural and other [Member] | Commercial credit cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 182 278 335
Ending Balance 177 182 278
Financing Receivable, Allowance for Credit Loss, Writeoff (302) (251) (105)
Recoveries 35 6 13
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 262 149 35
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 0   0
Commercial, financial, agricultural and other [Member] | Equipment Finance      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 7,844 3,399 1,086
Ending Balance 14,138 7,844 3,399
Financing Receivable, Allowance for Credit Loss, Writeoff (2,288) (2,020)  
Recoveries 626 174 0
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 7,956 6,291 2,850
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 0   0
Commercial, financial, agricultural and other [Member] | Time and Demand Loans Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 1,672 1,500 1,189
Ending Balance 1,611 1,672 1,500
Financing Receivable, Allowance for Credit Loss, Writeoff (1,480) (2,110)  
Recoveries 234 198 225
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 1,185 2,084 2,496
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 0   0
Commercial, financial, agricultural and other [Member] | Time and demand loans Predisagreggation      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   22,819 20,040
Ending Balance     22,819
Financing Receivable, Allowance for Credit Loss, Writeoff     (16,147)
Recoveries     260
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease)     (751)
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Equipment Finance      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Writeoff     (537)
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Time and Demand Loans Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Writeoff     (2,410)
Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 6,030 7,418 8,822
Ending Balance 7,808 6,030 7,418
Financing Receivable, Allowance for Credit Loss, Writeoff (1,294) (1,092)  
Recoveries 0 6 0
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 2,262 (302) (1,691)
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 810   287
Real Estate Construction [Member] | Construction Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 5,916 6,448 6,360
Ending Balance 7,118 5,916 6,448
Financing Receivable, Allowance for Credit Loss, Writeoff (732) (1,092)  
Recoveries 0 6 0
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 1,752 554 (139)
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 182   227
Real Estate Construction [Member] | Construction Residential      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 114 970 2,462
Ending Balance 690 114 970
Financing Receivable, Allowance for Credit Loss, Writeoff (562) 0  
Recoveries 0 0 0
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 510 (856) (1,552)
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 628   60
Real Estate Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Writeoff     0
Real Estate Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment | Construction Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Writeoff     0
Real Estate Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment | Construction Residential      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Allowance for Credit Loss, Writeoff     0
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 40,232 37,071 28,804
Ending Balance 40,271 40,232 37,071
Financing Receivable, Allowance for Credit Loss, Writeoff (7,188) (8,678) (6,277)
Recoveries 217 177 151
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 5,923 11,662 7,422
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1,087   6,971
Commercial real estate [Member] | Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 5,431 5,233 4,726
Ending Balance 5,528 5,431 5,233
Financing Receivable, Allowance for Credit Loss, Writeoff (766) 0 0
Recoveries 0 0 0
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 743 198 273
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 120   234
Commercial real estate [Member] | Nonowner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 23,332 19,995 16,426
Ending Balance 24,865 23,332 19,995
Financing Receivable, Allowance for Credit Loss, Writeoff (4,770) (7,138) (4,705)
Recoveries 148 59 127
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 5,212 10,416 5,408
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 943   2,739
Commercial real estate [Member] | Owner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 11,469 11,843 7,652
Ending Balance 9,878 11,469 11,843
Financing Receivable, Allowance for Credit Loss, Writeoff (1,652) (1,540) (1,572)
Recoveries 69 118 24
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) (32) 1,048 1,741
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 24   3,998
Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 21,117 21,332 21,218
Ending Balance 17,911 21,117 21,332
Financing Receivable, Allowance for Credit Loss, Writeoff (8,887) (9,663) (7,230)
Recoveries 3,422 2,882 2,219
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 2,257 6,566 5,122
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 2   3
Loans To Individuals [Member] | Automobiles      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1   3
Loans To Individuals [Member] | Consumer Credit Cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 341 372 412
Ending Balance 473 341 372
Financing Receivable, Allowance for Credit Loss, Writeoff (346) (428) (290)
Recoveries 79 96 87
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 399 301 163
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 0   0
Loans To Individuals [Member] | Other consumer loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 2,083 1,818 1,987
Ending Balance 2,476 2,083 1,818
Financing Receivable, Allowance for Credit Loss, Writeoff (1,516) (1,624) (1,353)
Recoveries 351 376 300
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 1,557 1,513 884
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1   0
Loans To Individuals [Member] | Automobile Loan      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 18,693 19,142 18,819
Ending Balance 14,962 18,693 19,142
Financing Receivable, Allowance for Credit Loss, Writeoff (7,025) (7,611) (5,587)
Recoveries 2,992 2,410 1,832
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 301 4,752 4,075
Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 22,396 23,901 21,412
Ending Balance 21,629 22,396 23,901
Financing Receivable, Allowance for Credit Loss, Writeoff (745) (483) (561)
Recoveries 234 370 247
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) (301) (1,392) 2,276
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 45   527
Residential Real Estate [Member] | Senior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 15,758 16,975 14,822
Ending Balance 15,056 15,758 16,975
Financing Receivable, Allowance for Credit Loss, Writeoff (501) (191) (246)
Recoveries 66 168 177
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) (305) (1,194) 2,025
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 38   197
Residential Real Estate [Member] | Junior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 6,638 6,926 6,590
Ending Balance 6,573 6,638 6,926
Financing Receivable, Allowance for Credit Loss, Writeoff (244) (292) (315)
Recoveries 168 202 70
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) 4 $ (198) 251
Financing Receivable, Excluding Accrued Interest, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date $ 7   $ 330