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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance $ 92,522 $ 101,309 $ 51,637
Ending Balance 102,906 92,522 101,309
Ending balance: individually evaluated for impaired 711 395 4,906
Ending balance: collectively evaluated for impaired 102,195 92,127 96,403
Financing receivable, before allowance for credit loss 7,642,143 6,839,230  
Financing Receivable, Allowance for Credit Loss, Writeoff (9,845) (13,058) (19,250)
Recoveries 2,708 4,648 2,057
Provision for credit losses 17,521 (377) 53,472
Loans 7,642,143 6,839,230  
Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 24,214 43,531 41,463
Ending balance: collectively evaluated for impaired 7,617,929 6,795,699 6,719,720
Financing receivable, before allowance for credit loss 7,642,143 6,839,230 6,761,183
Time and demand loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,023,824 1,159,524  
Commercial credit cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 13,920 13,928  
Senior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,547,192 1,299,534  
Junior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 647,477 620,716  
Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 431,151 385,432  
Nonowner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 1,510,347 1,465,247  
Owner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 483,514 400,418  
Consumer Credit Cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 10,657 11,151  
Other consumer loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 76,547 87,544  
Equipment Finance      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 79,674    
Time and Demand Loans Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 94,288    
Construction Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 395,439    
Construction Residential      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Financing receivable, before allowance for credit loss 117,662    
Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   13,393  
Ending Balance     13,393
Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 18,093 17,187 20,234
Ending Balance 22,650 18,093 17,187
Ending balance: individually evaluated for impaired 711 307 1,268
Ending balance: collectively evaluated for impaired 21,939 17,786 15,919
Financing Receivable, Allowance for Credit Loss, Writeoff (2,361) (7,020) (6,318)
Recoveries 394 2,430 314
Provision for credit losses 6,524 5,496 1,479
Commercial, financial, agricultural and other [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 3,330 3,032 5,411
Ending balance: collectively evaluated for impaired 1,208,376 1,170,420 1,550,575
Financing receivable, before allowance for credit loss 1,211,706 1,173,452 1,555,986
Commercial, financial, agricultural and other [Member] | Time and demand loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 15,283 16,838 0
Ending Balance 20,040 15,283 16,838
Ending balance: individually evaluated for impaired 711 307 1,268
Ending balance: collectively evaluated for impaired 19,329 17,539 15,570
Financing Receivable, Allowance for Credit Loss, Writeoff (710) (6,845) (6,220)
Recoveries 202 2,412 301
Provision for credit losses 5,265 5,441 1,515
Commercial, financial, agricultural and other [Member] | Time and demand loans | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 3,330 3,032 5,411
Ending balance: collectively evaluated for impaired 1,020,494 1,156,492 1,535,971
Financing receivable, before allowance for credit loss 1,023,824 1,159,524 1,541,382
Commercial, financial, agricultural and other [Member] | Commercial credit cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 247 349 0
Ending Balance 335 247 349
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 335 247 349
Financing Receivable, Allowance for Credit Loss, Writeoff (217) (175) (98)
Recoveries 71 18 13
Provision for credit losses 234 55 (36)
Commercial, financial, agricultural and other [Member] | Commercial credit cards | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 13,920 13,928 14,604
Financing receivable, before allowance for credit loss 13,920 13,928 14,604
Commercial, financial, agricultural and other [Member] | Equipment Finance      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 0    
Ending Balance 1,086 0  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 1,086    
Financing Receivable, Allowance for Credit Loss, Writeoff 0    
Recoveries 0    
Provision for credit losses 1,086    
Commercial, financial, agricultural and other [Member] | Equipment Finance | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 79,674    
Financing receivable, before allowance for credit loss 79,674    
Commercial, financial, agricultural and other [Member] | Time and Demand Loans Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 2,563    
Ending Balance 1,189 2,563  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 1,189    
Financing Receivable, Allowance for Credit Loss, Writeoff (1,434)    
Recoveries 121    
Provision for credit losses (61)    
Commercial, financial, agricultural and other [Member] | Time and Demand Loans Other | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 94,288    
Financing receivable, before allowance for credit loss 94,288    
Commercial, financial, agricultural and other [Member] | Time and demand loans Predisagreggation      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 17,846    
Ending Balance   17,846  
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   1,478  
Ending Balance     1,478
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Time and demand loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   21,242  
Ending Balance     21,242
Commercial, financial, agricultural and other [Member] | Cumulative Effect, Period of Adoption, Adjustment | Commercial credit cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   470  
Ending Balance     470
Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 4,220 7,966 2,558
Ending Balance 8,822 4,220 7,966
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 8,822 4,220 7,966
Financing Receivable, Allowance for Credit Loss, Writeoff 0 (9) 0
Recoveries 9 155 26
Provision for credit losses 4,593 (3,892) 4,820
Real Estate Construction [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 513,101 494,456 427,221
Financing receivable, before allowance for credit loss 513,101 494,456 427,221
Real Estate Construction [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   562  
Ending Balance     562
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 33,376 41,953 19,768
Ending Balance 28,804 33,376 41,953
Ending balance: individually evaluated for impaired 0 88 3,638
Ending balance: collectively evaluated for impaired 28,804 33,288 38,315
Financing Receivable, Allowance for Credit Loss, Writeoff (2,487) (1,659) (4,939)
Recoveries 769 135 312
Provision for credit losses (2,854) (7,053) 27,019
Commercial real estate [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 20,583 40,246 34,947
Ending balance: collectively evaluated for impaired 2,404,429 2,210,851 2,176,622
Financing receivable, before allowance for credit loss 2,425,012 2,251,097 2,211,569
Commercial real estate [Member] | Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 3,561 6,240 0
Ending Balance 4,726 3,561 6,240
Ending balance: individually evaluated for impaired 0 88 116
Ending balance: collectively evaluated for impaired 4,726 3,473 6,124
Financing Receivable, Allowance for Credit Loss, Writeoff (411) (1) 0
Recoveries 411 0 0
Provision for credit losses 1,165 (2,678) 4,593
Commercial real estate [Member] | Multifamily | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0 15,097 459
Ending balance: collectively evaluated for impaired 431,151 370,335 370,780
Financing receivable, before allowance for credit loss 431,151 385,432 371,239
Commercial real estate [Member] | Nonowner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 24,838 28,414 0
Ending Balance 16,426 24,838 28,414
Ending balance: individually evaluated for impaired 0 0 3,508
Ending balance: collectively evaluated for impaired 16,426 24,838 24,906
Financing Receivable, Allowance for Credit Loss, Writeoff (1,836) (1,556) (4,678)
Recoveries 342 125 187
Provision for credit losses (6,918) (2,145) 20,588
Commercial real estate [Member] | Nonowner Occupied Commercial Real Estate | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 19,918 24,205 31,450
Ending balance: collectively evaluated for impaired 1,490,429 1,441,042 1,389,701
Financing receivable, before allowance for credit loss 1,510,347 1,465,247 1,421,151
Commercial real estate [Member] | Owner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 4,977 7,299 0
Ending Balance 7,652 4,977 7,299
Ending balance: individually evaluated for impaired 0 0 14
Ending balance: collectively evaluated for impaired 7,652 4,977 7,285
Financing Receivable, Allowance for Credit Loss, Writeoff (240) (102) (261)
Recoveries 16 10 125
Provision for credit losses 2,899 (2,230) 1,838
Commercial real estate [Member] | Owner Occupied Commercial Real Estate | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 665 944 3,038
Ending balance: collectively evaluated for impaired 482,849 399,474 416,141
Financing receivable, before allowance for credit loss 483,514 400,418 419,179
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   (207)  
Ending Balance     (207)
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Multifamily      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   1,647  
Ending Balance     1,647
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Nonowner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   12,317  
Ending Balance     12,317
Commercial real estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Owner Occupied Commercial Real Estate      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   5,597  
Ending Balance     5,597
Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 24,208 19,845 4,984
Ending Balance 21,218 24,208 19,845
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 21,218 24,208 19,845
Financing Receivable, Allowance for Credit Loss, Writeoff (4,658) (4,061) (6,953)
Recoveries 1,349 1,460 991
Provision for credit losses 319 6,964 16,539
Loans To Individuals [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 1,297,655 999,975 815,815
Financing receivable, before allowance for credit loss 1,297,655 999,975 815,815
Loans To Individuals [Member] | Automobiles      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 21,392 16,133 0
Ending Balance 18,819 21,392 16,133
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 18,819 21,392 16,133
Financing Receivable, Allowance for Credit Loss, Writeoff (2,639) (1,792) (3,954)
Recoveries 787 1,016 745
Provision for credit losses (721) 6,035 13,236
Loans To Individuals [Member] | Automobiles | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 1,210,451 901,280 712,800
Financing receivable, before allowance for credit loss 1,210,451 901,280 712,800
Loans To Individuals [Member] | Consumer Credit Cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 496 635 0
Ending Balance 412 496 635
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 412 496 635
Financing Receivable, Allowance for Credit Loss, Writeoff (486) (425) (595)
Recoveries 75 71 36
Provision for credit losses 327 215 973
Loans To Individuals [Member] | Consumer Credit Cards | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 10,657 11,151 12,360
Financing receivable, before allowance for credit loss 10,657 11,151 12,360
Loans To Individuals [Member] | Other consumer loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 2,320 3,077 0
Ending Balance 1,987 2,320 3,077
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 1,987 2,320 3,077
Financing Receivable, Allowance for Credit Loss, Writeoff (1,533) (1,844) (2,404)
Recoveries 487 373 210
Provision for credit losses 713 714 2,330
Loans To Individuals [Member] | Other consumer loans | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 76,547 87,544 90,655
Financing receivable, before allowance for credit loss 76,547 87,544 90,655
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   4,284  
Ending Balance     4,284
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment | Automobiles      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   6,106  
Ending Balance     6,106
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment | Consumer Credit Cards      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   221  
Ending Balance     221
Loans To Individuals [Member] | Cumulative Effect, Period of Adoption, Adjustment | Other consumer loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   2,941  
Ending Balance     2,941
Residential Real Estate [Member]      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 12,625 14,358 4,093
Ending Balance 21,412 12,625 14,358
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 21,412 12,625 14,358
Financing Receivable, Allowance for Credit Loss, Writeoff (339) (309) (1,040)
Recoveries 187 468 414
Provision for credit losses 8,939 (1,892) 3,615
Residential Real Estate [Member] | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 301 253 1,105
Ending balance: collectively evaluated for impaired 2,194,368 1,919,997 1,749,487
Financing receivable, before allowance for credit loss 2,194,669 1,920,250 1,750,592
Residential Real Estate [Member] | Senior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 7,459 7,919 0
Ending Balance 14,822 7,459 7,919
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 14,822 7,459 7,919
Financing Receivable, Allowance for Credit Loss, Writeoff (163) (60) (550)
Recoveries 130 337 296
Provision for credit losses 7,396 (737) 847
Residential Real Estate [Member] | Senior Lien | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 301 0 528
Ending balance: collectively evaluated for impaired 1,546,891 1,299,534 1,143,795
Financing receivable, before allowance for credit loss 1,547,192 1,299,534 1,144,323
Residential Real Estate [Member] | Junior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 5,166 6,439 0
Ending Balance 6,590 5,166 6,439
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 6,590 5,166 6,439
Financing Receivable, Allowance for Credit Loss, Writeoff (176) (249) (490)
Recoveries 57 131 118
Provision for credit losses 1,543 (1,155) 2,768
Residential Real Estate [Member] | Junior Lien | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0 253 577
Ending balance: collectively evaluated for impaired 647,477 620,463 605,692
Financing receivable, before allowance for credit loss 647,477 620,716 606,269
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   7,276  
Ending Balance     7,276
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Senior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   7,326  
Ending Balance     7,326
Residential Real Estate [Member] | Cumulative Effect, Period of Adoption, Adjustment | Junior Lien      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance   4,043  
Ending Balance     $ 4,043
Construction | Construction Other      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 3,278    
Ending Balance 6,360 3,278  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 6,360    
Financing Receivable, Allowance for Credit Loss, Writeoff 0    
Recoveries 9    
Provision for credit losses 3,073    
Construction | Construction Other | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 395,439    
Financing receivable, before allowance for credit loss 395,439    
Construction | Construction Residential      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning Balance 942    
Ending Balance 2,462 $ 942  
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 2,462    
Financing Receivable, Allowance for Credit Loss, Writeoff 0    
Recoveries 0    
Provision for credit losses 1,520    
Construction | Construction Residential | Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Ending balance: individually evaluated for impaired 0    
Ending balance: collectively evaluated for impaired 117,662    
Financing receivable, before allowance for credit loss $ 117,662