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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance $ 91,188 $ 96,763 $ 92,522 $ 101,309  
Charge-offs (2,106) (4,839) (3,729) (8,604)  
Recoveries 578 912 1,067 1,407  
Provision for credit losses 3,943 4,202 3,743 2,926  
Ending Balance 93,603 97,038 93,603 97,038 $ 92,522
Ending balance: individually evaluated for impaired 360 2,946 360 2,946  
Ending balance: collectively evaluated for impaired 93,243 94,092 93,243 94,092  
Loans and Leases Receivable, Net of Deferred Income (7,119,754) (6,740,535) (7,119,754) (6,740,535) (6,839,230)
Ending balance: individually evaluated for impaired 24,795 41,328 24,795 41,328  
Ending balance: collectively evaluated for impaired 7,094,959 6,699,207 7,094,959 6,699,207  
Provision for credit losses 4,099 5,413 6,063 1,023  
Commercial, financial, agricultural and other [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 20,721 21,801 18,093 17,187  
Charge-offs (509) (3,887) (984) (4,456)  
Recoveries 79 103 159 193  
Provision for credit losses 1,698 3,449 4,721 8,542  
Ending Balance 21,989 21,466 21,989 21,466 18,093
Ending balance: individually evaluated for impaired 0 2,358 0 2,358  
Ending balance: collectively evaluated for impaired 21,989 19,108 21,989 19,108  
Loans and Leases Receivable, Net of Deferred Income (1,170,583) (1,374,177) (1,170,583) (1,374,177) (1,173,452)
Ending balance: individually evaluated for impaired 2,582 13,688 2,582 13,688  
Ending balance: collectively evaluated for impaired 1,168,001 1,360,489 1,168,001 1,360,489  
Commercial, financial, agricultural and other [Member] | Time and Demand Loans          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 18,907 21,427 15,283 16,838  
Charge-offs (139) (3,878) (283) (4,338)  
Recoveries 25 99 78 188  
Provision for credit losses 1,128 3,450 4,843 8,410  
Ending Balance 19,921 21,098 19,921 21,098 15,283
Ending balance: individually evaluated for impaired 0 2,358 0 2,358  
Ending balance: collectively evaluated for impaired 19,921 18,740 19,921 18,740  
Loans and Leases Receivable, Net of Deferred Income (1,031,930) (1,360,065) (1,031,930) (1,360,065) (1,159,524)
Ending balance: individually evaluated for impaired 2,582 13,688 2,582 13,688  
Ending balance: collectively evaluated for impaired 1,029,348 1,346,377 1,029,348 1,346,377  
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 342 374 247 349  
Charge-offs (58) (9) (77) (118)  
Recoveries 25 4 26 5  
Provision for credit losses 78 (1) 191 132  
Ending Balance 387 368 387 368 247
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 387 368 387 368  
Loans and Leases Receivable, Net of Deferred Income (16,329) (14,112) (16,329) (14,112) (13,928)
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 16,329 14,112 16,329 14,112  
Commercial, financial, agricultural and other [Member] | Time and Demand Loans Other          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 1,441   2,563    
Charge-offs (312)   (624)    
Recoveries 29   55    
Provision for credit losses 251   (585)    
Ending Balance 1,409   1,409   2,563
Ending balance: individually evaluated for impaired 0   0    
Ending balance: collectively evaluated for impaired 1,409   1,409    
Loans and Leases Receivable, Net of Deferred Income (101,262)   (101,262)    
Ending balance: individually evaluated for impaired 0   0    
Ending balance: collectively evaluated for impaired 101,262   101,262    
Commercial, financial, agricultural and other [Member] | Equipment Finance          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 31   0    
Charge-offs 0   0    
Recoveries 0   0    
Provision for credit losses 241   272    
Ending Balance 272   272   0
Ending balance: individually evaluated for impaired 0   0    
Ending balance: collectively evaluated for impaired 272   272    
Loans and Leases Receivable, Net of Deferred Income (21,062)   (21,062)    
Ending balance: individually evaluated for impaired 0   0    
Ending balance: collectively evaluated for impaired 21,062   21,062    
Residential real estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 16,728 12,829 12,625 14,358  
Charge-offs (5) (14) (144) (119)  
Recoveries 31 174 60 211  
Provision for credit losses 993 (56) 5,206 (1,517)  
Ending Balance 17,747 12,933 17,747 12,933 12,625
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 17,747 12,933 17,747 12,933  
Loans and Leases Receivable, Net of Deferred Income (2,100,201) (1,828,783) (2,100,201) (1,828,783) (1,920,250)
Ending balance: individually evaluated for impaired 253 541 253 541  
Ending balance: collectively evaluated for impaired 2,099,948 1,828,242 2,099,948 1,828,242  
Residential real estate [Member] | Senior Lien          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 11,125 7,227 7,459 7,919  
Charge-offs (5) (13) (45) (36)  
Recoveries 22 159 45 182  
Provision for credit losses 718 21 4,401 (671)  
Ending Balance 11,860 7,394 11,860 7,394 7,459
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 11,860 7,394 11,860 7,394  
Loans and Leases Receivable, Net of Deferred Income (1,459,861) (1,218,300) (1,459,861) (1,218,300) (1,299,534)
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 1,459,861 1,218,300 1,459,861 1,218,300  
Residential real estate [Member] | Junior Lien          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 5,603 5,602 5,166 6,439  
Charge-offs 0 (1) (99) (83)  
Recoveries 9 15 15 29  
Provision for credit losses 275 (77) 805 (846)  
Ending Balance 5,887 5,539 5,887 5,539 5,166
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 5,887 5,539 5,887 5,539  
Loans and Leases Receivable, Net of Deferred Income (640,340) (610,483) (640,340) (610,483) (620,716)
Ending balance: individually evaluated for impaired 253 541 253 541  
Ending balance: collectively evaluated for impaired 640,087 609,942 640,087 609,942  
Commercial Real Estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 33,704 37,668 33,376 41,953  
Charge-offs (552) (7) (552) (1,557)  
Recoveries 5 1 19 40  
Provision for credit losses (1,770) (1,867) (1,456) (4,641)  
Ending Balance 31,387 35,795 31,387 35,795 33,376
Ending balance: individually evaluated for impaired 360 588 360 588  
Ending balance: collectively evaluated for impaired 31,027 35,207 31,027 35,207  
Loans and Leases Receivable, Net of Deferred Income (2,319,094) (2,205,758) (2,319,094) (2,205,758) (2,251,097)
Ending balance: individually evaluated for impaired 21,960 27,099 21,960 27,099  
Ending balance: collectively evaluated for impaired 2,297,134 2,178,659 2,297,134 2,178,659  
Commercial Real Estate [Member] | Multifamily          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 3,610 4,251 3,561 6,240  
Charge-offs (411) 0 (411) (1)  
Recoveries 0 0 0 0  
Provision for credit losses 356 128 405 (1,860)  
Ending Balance 3,555 4,379 3,555 4,379 3,561
Ending balance: individually evaluated for impaired 0 113 0 113  
Ending balance: collectively evaluated for impaired 3,555 4,266 3,555 4,266  
Loans and Leases Receivable, Net of Deferred Income (360,335) (385,905) (360,335) (385,905) (385,432)
Ending balance: individually evaluated for impaired 0 445 0 445  
Ending balance: collectively evaluated for impaired 360,335 385,460 360,335 385,460  
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 23,267 27,889 24,838 28,414  
Charge-offs (141) (7) (141) (1,556)  
Recoveries 5 1 10 40  
Provision for credit losses (2,178) (972) (3,754) 13  
Ending Balance 20,953 26,911 20,953 26,911 24,838
Ending balance: individually evaluated for impaired 360 475 360 475  
Ending balance: collectively evaluated for impaired 20,593 26,436 20,593 26,436  
Loans and Leases Receivable, Net of Deferred Income (1,510,804) (1,429,192) (1,510,804) (1,429,192) (1,465,247)
Ending balance: individually evaluated for impaired 21,044 24,624 21,044 24,624  
Ending balance: collectively evaluated for impaired 1,489,760 1,404,568 1,489,760 1,404,568  
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 6,827 5,528 4,977 7,299  
Charge-offs 0 0 0 0  
Recoveries 0 0 9 0  
Provision for credit losses 52 (1,023) 1,893 (2,794)  
Ending Balance 6,879 4,505 6,879 4,505 4,977
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 6,879 4,505 6,879 4,505  
Loans and Leases Receivable, Net of Deferred Income (447,955) (390,661) (447,955) (390,661) (400,418)
Ending balance: individually evaluated for impaired 916 2,030 916 2,030  
Ending balance: collectively evaluated for impaired 447,039 388,631 447,039 388,631  
Loans to individuals [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 15,105 20,444 24,208 19,845  
Charge-offs (1,040) (931) (2,049) (2,472)  
Recoveries 463 499 829 828  
Provision for credit losses 2,423 2,547 (6,037) 4,358  
Ending Balance 16,951 22,559 16,951 22,559 24,208
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 16,951 22,559 16,951 22,559  
Loans and Leases Receivable, Net of Deferred Income (1,136,884) (917,001) (1,136,884) (917,001) (999,975)
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 1,136,884 917,001 1,136,884 917,001  
Loans to individuals [Member] | Automobiles          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 12,635 16,888 21,392 16,133  
Charge-offs (425) (388) (977) (1,068)  
Recoveries 288 394 543 575  
Provision for credit losses 2,065 2,404 (6,395) 3,658  
Ending Balance 14,563 19,298 14,563 19,298 21,392
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 14,563 19,298 14,563 19,298  
Loans and Leases Receivable, Net of Deferred Income (1,047,104) (829,150) (1,047,104) (829,150) (901,280)
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 1,047,104 829,150 1,047,104 829,150  
Loans to individuals [Member] | Consumer Credit Cards          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 382 689 496 635  
Charge-offs (124) (79) (233) (247)  
Recoveries 14 25 38 42  
Provision for credit losses 40 (107) 11 98  
Ending Balance 312 528 312 528 496
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 312 528 312 528  
Loans and Leases Receivable, Net of Deferred Income (8,717) (10,834) (8,717) (10,834) (11,151)
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 8,717 10,834 8,717 10,834  
Loans to individuals [Member] | Other Consumer Loans          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 2,088 2,867 2,320 3,077  
Charge-offs (491) (464) (839) (1,157)  
Recoveries 161 80 248 211  
Provision for credit losses 318 250 347 602  
Ending Balance 2,076 2,733 2,076 2,733 2,320
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 2,076 2,733 2,076 2,733  
Loans and Leases Receivable, Net of Deferred Income (81,063) (77,017) (81,063) (77,017) (87,544)
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 81,063 77,017 81,063 77,017  
Real estate construction [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 4,930 4,021 4,220 7,966  
Charge-offs 0 0 0 0  
Recoveries 0 135 0 135  
Provision for credit losses 599 129 1,309 (3,816)  
Ending Balance 5,529 4,285 5,529 4,285 4,220
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 5,529 4,285 5,529 4,285  
Loans and Leases Receivable, Net of Deferred Income (392,992) (414,816) (392,992) (414,816) (494,456)
Ending balance: individually evaluated for impaired 0 0 0 0  
Ending balance: collectively evaluated for impaired 392,992 $ 414,816 392,992 $ 414,816  
Real estate construction [Member] | Construction Residential          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 1,755   942    
Charge-offs 0   0    
Recoveries 0   0    
Provision for credit losses 174   987    
Ending Balance 1,929   1,929   942
Ending balance: individually evaluated for impaired 0   0    
Ending balance: collectively evaluated for impaired 1,929   1,929    
Loans and Leases Receivable, Net of Deferred Income (100,592)   (100,592)    
Ending balance: individually evaluated for impaired 0   0    
Ending balance: collectively evaluated for impaired 100,592   100,592    
Real estate construction [Member] | Construction Other          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 3,175   3,278    
Charge-offs 0   0    
Recoveries 0   0    
Provision for credit losses 425   322    
Ending Balance 3,600   3,600   $ 3,278
Ending balance: individually evaluated for impaired 0   0    
Ending balance: collectively evaluated for impaired 3,600   3,600    
Loans and Leases Receivable, Net of Deferred Income (292,400)   (292,400)    
Ending balance: individually evaluated for impaired 0   0    
Ending balance: collectively evaluated for impaired $ 292,400   $ 292,400