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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance $ 123,654 $ 133,546 $ 117,718 $ 102,906 $ 102,906
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   27,205  
Charge-offs (9,789) (4,598) (20,821) (15,824) (33,267)
Recoveries 1,004 622 3,332 2,010 3,115
Provision for credit losses 11,243 4,767 25,883 18,040  
Ending Balance 126,112 134,337 126,112 134,337 117,718
Time and Demand Loans          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (8,161)   (16,147)
Recoveries     405   260
Commercial Credit Cards          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (183)   (105)
Recoveries     5   13
Senior Lien          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (137)   (246)
Recoveries     150   177
Junior Lien          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (224)   (315)
Recoveries     71   70
Multifamily          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     0   0
Recoveries     0   0
Nonowner Occupied Commercial Real Estate          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (507)   (4,705)
Recoveries     53   127
Owner Occupied Commercial Real Estate          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (1,540)   (1,572)
Recoveries     113   24
Automobiles          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (5,552)   (5,587)
Recoveries     1,937   1,832
Consumer Credit Cards          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (348)   (290)
Recoveries     78   87
Other Consumer Loans          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (1,248)   (1,353)
Recoveries     291   300
Construction Residential          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     0   0
Recoveries     0   0
Construction Other          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (35)   0
Recoveries     6   0
Time and Demand Loans Other          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (1,651)   (2,410)
Recoveries     151   225
Equipment Finance          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Charge-offs     (1,235)   (537)
Recoveries     72   0
Commercial, financial, agricultural and other [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 30,608 41,714 27,996 22,650 22,650
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   19,417  
Charge-offs (5,980) (1,762) (11,230) (9,102)  
Recoveries 110 98 633 352  
Provision for credit losses 5,965 (2,645) 13,304 4,088  
Ending Balance 30,703 37,405 30,703 37,405 27,996
Commercial, financial, agricultural and other [Member] | Time and Demand Loans          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 23,589 37,873 22,819 20,040 20,040
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   19,417  
Charge-offs (4,784) (954) (8,161) (7,424)  
Recoveries 11 46 405 214  
Provision for credit losses 3,730 (3,914) 7,483 804  
Ending Balance 22,546 33,051 22,546 33,051 22,819
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 244 320 278 335 335
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   0  
Charge-offs (81) (28) (183) (63)  
Recoveries 5 6 5 13  
Provision for credit losses 69 9 137 22  
Ending Balance 237 307 237 307 278
Commercial, financial, agricultural and other [Member] | Time and Demand Loans Other          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 1,483 1,447 1,500 1,189 1,189
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   0  
Charge-offs (594) (780) (1,651) (1,570)  
Recoveries 58 46 151 125  
Provision for credit losses 443 707 1,390 1,676  
Ending Balance 1,390 1,420 1,390 1,420 1,500
Commercial, financial, agricultural and other [Member] | Equipment Finance          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 5,292 2,074 3,399 1,086 1,086
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   0  
Charge-offs (521) 0 (1,235) (45)  
Recoveries 36 0 72 0  
Provision for credit losses 1,723 553 4,294 1,586  
Ending Balance 6,530 2,627 6,530 2,627 3,399
Residential real estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 22,173 23,740 23,901 21,412 21,412
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   527  
Charge-offs (106) (304) (361) (384)  
Recoveries 51 57 221 128  
Provision for credit losses 521 447 (1,122) 2,257  
Ending Balance 22,639 23,940 22,639 23,940 23,901
Residential real estate [Member] | Senior Lien          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 15,745 16,563 16,975 14,822 14,822
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   197  
Charge-offs (28) (107) (137) (124)  
Recoveries 37 22 150 65  
Provision for credit losses 249 553 (985) 2,071  
Ending Balance 16,003 17,031 16,003 17,031 16,975
Residential real estate [Member] | Junior Lien          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 6,428 7,177 6,926 6,590 6,590
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   330  
Charge-offs (78) (197) (224) (260)  
Recoveries 14 35 71 63  
Provision for credit losses 272 (106) (137) 186  
Ending Balance 6,636 6,909 6,636 6,909 6,926
Commercial Real Estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 42,544 38,927 37,071 28,804 28,804
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   6,971  
Charge-offs (1,423) (172) (2,047) (1,689)  
Recoveries 42 6 166 142  
Provision for credit losses 3,519 4,338 9,492 8,871  
Ending Balance 44,682 43,099 44,682 43,099 37,071
Commercial Real Estate [Member] | Multifamily          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 5,206 5,775 5,233 4,726 4,726
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   234  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision for credit losses (151) 46 (178) 861  
Ending Balance 5,055 5,821 5,055 5,821 5,233
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 25,036 21,710 19,995 16,426 16,426
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   2,739  
Charge-offs (37) (172) (507) (172)  
Recoveries 5 2 53 126  
Provision for credit losses 2,942 3,952 8,405 6,373  
Ending Balance 27,946 25,492 27,946 25,492 19,995
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 12,302 11,442 11,843 7,652 7,652
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   3,998  
Charge-offs (1,386) 0 (1,540) (1,517)  
Recoveries 37 4 113 16  
Provision for credit losses 728 340 1,265 1,637  
Ending Balance 11,681 11,786 11,681 11,786 11,843
Loans to individuals [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 21,940 21,437 21,332 21,218 21,218
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   3  
Charge-offs (2,280) (2,360) (7,148) (4,649)  
Recoveries 801 461 2,306 1,388  
Provision for credit losses 1,447 1,851 5,418 3,429  
Ending Balance 21,908 21,389 21,908 21,389 21,332
Loans to individuals [Member] | Automobiles          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 19,676 19,258 19,142 18,819 18,819
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   3  
Charge-offs (1,827) (1,883) (5,552) (3,469)  
Recoveries 676 412 1,937 1,114  
Provision for credit losses 1,067 1,503 4,065 2,823  
Ending Balance 19,592 19,290 19,592 19,290 19,142
Loans to individuals [Member] | Consumer Credit Cards          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 346 375 372 412 412
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   0  
Charge-offs (120) (59) (348) (205)  
Recoveries 33 16 78 63  
Provision for credit losses 81 38 238 100  
Ending Balance 340 370 340 370 372
Loans to individuals [Member] | Other Consumer Loans          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 1,918 1,804 1,818 1,987 1,987
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   0  
Charge-offs (333) (418) (1,248) (975)  
Recoveries 92 33 291 211  
Provision for credit losses 299 310 1,115 506  
Ending Balance 1,976 1,729 1,976 1,729 1,818
Real estate construction [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 6,389 7,728 7,418 8,822 8,822
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   287  
Charge-offs 0 0 (35) 0  
Recoveries 0 0 6 0  
Provision for credit losses (209) 776 (1,209) (605)  
Ending Balance 6,180 8,504 6,180 8,504 7,418
Real estate construction [Member] | Construction Residential          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 372 1,583 970 2,462 2,462
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   60  
Charge-offs 0 0 0 0  
Recoveries 0 0 0 0  
Provision for credit losses (84) (431) (682) (1,370)  
Ending Balance 288 1,152 288 1,152 970
Real estate construction [Member] | Construction Other          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 6,017 6,145 6,448 6,360 6,360
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date   0   227  
Charge-offs 0 0 (35) 0  
Recoveries 0 0 6 0  
Provision for credit losses (125) 1,207 (527) 765  
Ending Balance $ 5,892 $ 7,352 $ 5,892 $ 7,352 $ 6,448