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Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans $ 36,400,643   $ 36,400,643   $ 32,991,927
2024 1,441 $ 593 1,570 $ 603  
2023 9,546 5,360 13,605 9,140  
2022 1,616 12,829 13,317 26,689  
2021 947 1,868 5,279 3,034  
2020 1,105 280 1,593 7,937  
Prior 3,167 736 11,449 4,463  
Revolving 1,143 1,084 3,213 3,395  
Total 18,965 22,750 50,026 55,261  
Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 36,400,643   36,400,643   32,991,927
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 10,408,095   10,408,095   9,512,230
Total 11,512 16,705 25,098 37,459  
Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 1,603,172   1,603,172   1,873,630
Originated one year before current year 1,657,936   1,657,936   1,719,159
Originated two years before current year 1,412,873   1,412,873   1,039,832
Originated three years before current year 790,476   790,476   600,282
Originated four years before current year 513,069   513,069   489,693
Originated more than five years before current fiscal year 678,651   678,651   583,939
Revolving 2,792,701   2,792,701   2,214,453
Revolving to Term 734,485   734,485   758,478
Total loans 10,183,363   10,183,363   9,279,466
2024 1,234 0 1,234 0  
2023 8,031 4,154 10,389 6,254  
2022 633 12,271 10,263 23,432  
2021 297 0 719 120  
2020 840 0 891 6,789  
Prior 55 63 625 302  
Revolving 422 217 977 562  
Total 11,512 16,705 25,098 37,459  
Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 16,356,216   16,356,216   14,140,629
Total 2,799 2,291 12,541 5,938  
Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 1,766,633   1,766,633   2,279,487
Originated one year before current year 2,663,562   2,663,562   3,664,419
Originated two years before current year 4,241,021   4,241,021   2,695,350
Originated three years before current year 2,512,924   2,512,924   1,636,367
Originated four years before current year 1,524,517   1,524,517   1,163,055
Originated more than five years before current fiscal year 2,209,865   2,209,865   1,350,392
Revolving 148,824   148,824   107,225
Revolving to Term 1,113,242   1,113,242   1,075,276
Total loans 16,180,588   16,180,588   13,971,571
2024 0 0 0 0  
2023 140 0 140 54  
2022 61 0 84 735  
2021 44 1,744 2,688 2,144  
2020 0 0 0 0  
Prior 2,554 547 9,629 3,005  
Revolving 0 0 0 0  
Total 2,799 2,291 12,541 5,938  
BBCC          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 676 1,049 1,687 1,171  
BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 60,655   60,655   81,840
Originated one year before current year 87,413   87,413   65,503
Originated two years before current year 60,956   60,956   46,152
Originated three years before current year 38,342   38,342   39,072
Originated four years before current year 32,467   32,467   28,622
Originated more than five years before current fiscal year 32,540   32,540   21,170
Revolving 66,444   66,444   70,966
Revolving to Term 21,543   21,543   48,497
Total loans 400,360   400,360   401,822
2024 0 499 0 499  
2023 481 501 1,086 548  
2022 164 49 393 77  
2021 21 0 56 47  
2020 0 0 112 0  
Prior 10 0 40 0  
Revolving 0 0 0 0  
Total 676 1,049 1,687 1,171  
Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 371,456   371,456   453,859
Originated one year before current year 492,735   492,735   1,513,234
Originated two years before current year 1,480,495   1,480,495   1,840,082
Originated three years before current year 1,701,895   1,701,895   1,708,506
Originated four years before current year 1,610,184   1,610,184   434,861
Originated more than five years before current fiscal year 1,100,794   1,100,794   748,622
Revolving 60   60   0
Revolving to Term 277   277   279
Total loans 6,757,896   6,757,896   6,699,443
2024 0 0 0 0  
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
2020 0 0 0 0  
Prior 0 15 0 256  
Revolving 0 0 0 0  
Total 0 15 0 256  
Residential real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 6,757,896   6,757,896   6,699,443
Residential real estate | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 371,299   371,299   453,743
Originated one year before current year 488,590   488,590   1,508,671
Originated two years before current year 1,469,840   1,469,840   1,836,078
Originated three years before current year 1,696,514   1,696,514   1,705,131
Originated four years before current year 1,605,901   1,605,901   430,783
Originated more than five years before current fiscal year 1,067,863   1,067,863   722,987
Revolving 60   60   0
Revolving to Term 277   277   279
Total loans 6,700,344   6,700,344   6,657,672
Residential real estate | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 157   157   116
Originated one year before current year 4,145   4,145   4,563
Originated two years before current year 10,655   10,655   4,004
Originated three years before current year 5,381   5,381   3,375
Originated four years before current year 4,283   4,283   4,078
Originated more than five years before current fiscal year 32,931   32,931   25,635
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 57,552   57,552   41,771
Indirect          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 348,669   348,669   393,741
Originated one year before current year 310,701   310,701   357,294
Originated two years before current year 258,639   258,639   163,942
Originated three years before current year 109,172   109,172   83,418
Originated four years before current year 47,965   47,965   38,285
Originated more than five years before current fiscal year 21,088   21,088   14,106
Revolving 0   0   0
Revolving to Term 0   0   196
Total loans 1,096,234   1,096,234   1,050,982
2024 199 75 253 85  
2023 797 276 1,698 954  
2022 360 86 1,209 640  
2021 110 12 431 153  
2020 41 10 80 137  
Prior 208 31 266 120  
Revolving 0 0 0 0  
Total 1,715 490 3,937 2,089  
Indirect | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,096,234   1,096,234   1,050,982
Indirect | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 348,367   348,367   393,369
Originated one year before current year 309,592   309,592   355,822
Originated two years before current year 257,064   257,064   162,735
Originated three years before current year 107,785   107,785   82,871
Originated four years before current year 47,552   47,552   37,967
Originated more than five years before current fiscal year 20,760   20,760   13,815
Revolving 0   0   0
Revolving to Term 0   0   196
Total loans 1,091,120   1,091,120   1,046,775
Indirect | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 302   302   372
Originated one year before current year 1,109   1,109   1,472
Originated two years before current year 1,575   1,575   1,207
Originated three years before current year 1,387   1,387   547
Originated four years before current year 413   413   318
Originated more than five years before current fiscal year 328   328   291
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 5,114   5,114   4,207
Direct          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 56,368   56,368   109,439
Originated one year before current year 68,410   68,410   90,841
Originated two years before current year 59,468   59,468   93,008
Originated three years before current year 53,983   53,983   48,947
Originated four years before current year 22,464   22,464   29,869
Originated more than five years before current fiscal year 58,559   58,559   71,001
Revolving 97,354   97,354   75,204
Revolving to Term 2,595   2,595   4,863
Total loans 419,201   419,201   523,172
2024 8 19 83 19  
2023 97 429 292 1,330  
2022 398 423 1,368 1,805  
2021 475 112 1,351 570  
2020 224 270 510 1,011  
Prior 214 60 609 450  
Revolving 721 867 2,236 2,833  
Total 2,137 2,180 6,449 8,018  
Direct | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 419,201   419,201   523,172
Direct | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 56,302   56,302   109,372
Originated one year before current year 68,103   68,103   90,310
Originated two years before current year 58,794   58,794   92,491
Originated three years before current year 53,593   53,593   48,387
Originated four years before current year 21,871   21,871   29,659
Originated more than five years before current fiscal year 56,853   56,853   67,129
Revolving 97,352   97,352   75,080
Revolving to Term 2,509   2,509   4,852
Total loans 415,377   415,377   517,280
Direct | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 66   66   67
Originated one year before current year 307   307   531
Originated two years before current year 674   674   517
Originated three years before current year 390   390   560
Originated four years before current year 593   593   210
Originated more than five years before current fiscal year 1,706   1,706   3,872
Revolving 2   2   124
Revolving to Term 86   86   11
Total loans 3,824   3,824   5,892
Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   290
Originated one year before current year 0   0   474
Originated two years before current year 1,573   1,573   488
Originated three years before current year 349   349   544
Originated four years before current year 1,379   1,379   1,420
Originated more than five years before current fiscal year 17,142   17,142   8,810
Revolving 1,303,478   1,303,478   1,022,233
Revolving to Term 39,080   39,080   31,212
Total loans 1,363,001   1,363,001   1,065,471
2024 0 0 0 0  
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 34 0  
2020 0 0 0 0  
Prior 126 20 280 330  
Revolving 0 0 0 0  
Total 126 $ 20 314 $ 330  
Home equity | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,363,001   1,363,001   1,065,471
Home equity | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   290
Originated one year before current year 0   0   164
Originated two years before current year 262   262   160
Originated three years before current year 203   203   140
Originated four years before current year 1,135   1,135   679
Originated more than five years before current fiscal year 11,759   11,759   4,483
Revolving 1,300,266   1,300,266   1,019,389
Revolving to Term 28,857   28,857   23,918
Total loans 1,342,482   1,342,482   1,049,223
Home equity | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   0
Originated one year before current year 0   0   310
Originated two years before current year 1,311   1,311   328
Originated three years before current year 146   146   404
Originated four years before current year 244   244   741
Originated more than five years before current fiscal year 5,383   5,383   4,327
Revolving 3,212   3,212   2,844
Revolving to Term 10,223   10,223   7,294
Total loans 20,519   20,519   16,248
Pass | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 1,555,665   1,555,665   1,826,289
Originated one year before current year 1,519,627   1,519,627   1,573,669
Originated two years before current year 1,243,415   1,243,415   985,964
Originated three years before current year 734,457   734,457   520,883
Originated four years before current year 467,036   467,036   450,911
Originated more than five years before current fiscal year 636,137   636,137   495,979
Revolving 2,560,086   2,560,086   2,051,985
Revolving to Term 657,716   657,716   651,953
Total loans 9,374,139   9,374,139   8,557,633
Pass | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 1,649,355   1,649,355   2,177,841
Originated one year before current year 2,584,786   2,584,786   3,515,702
Originated two years before current year 3,882,068   3,882,068   2,563,638
Originated three years before current year 2,267,541   2,267,541   1,576,044
Originated four years before current year 1,407,050   1,407,050   1,010,351
Originated more than five years before current fiscal year 1,877,393   1,877,393   1,161,119
Revolving 143,314   143,314   103,332
Revolving to Term 929,671   929,671   960,386
Total loans 14,741,178   14,741,178   13,068,413
Pass | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 60,158   60,158   81,102
Originated one year before current year 83,681   83,681   64,583
Originated two years before current year 58,701   58,701   44,307
Originated three years before current year 36,774   36,774   38,086
Originated four years before current year 31,632   31,632   27,557
Originated more than five years before current fiscal year 30,934   30,934   19,028
Revolving 61,932   61,932   68,807
Revolving to Term 16,809   16,809   33,361
Total loans 380,621   380,621   376,831
Special Mention | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 34,491   34,491   20,038
Originated one year before current year 62,344   62,344   90,031
Originated two years before current year 43,253   43,253   19,953
Originated three years before current year 14,913   14,913   36,906
Originated four years before current year 18,003   18,003   25,756
Originated more than five years before current fiscal year 12,073   12,073   47,357
Revolving 120,436   120,436   89,765
Revolving to Term 25,235   25,235   44,348
Total loans 330,748   330,748   374,154
Special Mention | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 47,435   47,435   69,648
Originated one year before current year 35,196   35,196   69,946
Originated two years before current year 105,531   105,531   68,708
Originated three years before current year 126,457   126,457   27,059
Originated four years before current year 49,338   49,338   52,107
Originated more than five years before current fiscal year 68,825   68,825   95,896
Revolving 4,492   4,492   3,893
Revolving to Term 56,651   56,651   64,730
Total loans 493,925   493,925   451,987
Special Mention | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 392   392   0
Originated one year before current year 2,740   2,740   0
Originated two years before current year 1,034   1,034   857
Originated three years before current year 720   720   700
Originated four years before current year 723   723   1,001
Originated more than five years before current fiscal year 369   369   349
Revolving 3,818   3,818   2,144
Revolving to Term 3,074   3,074   12,728
Total loans 12,870   12,870   17,779
Substandard | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 11,204   11,204   27,271
Originated one year before current year 63,668   63,668   41,164
Originated two years before current year 97,872   97,872   27,990
Originated three years before current year 32,674   32,674   37,618
Originated four years before current year 21,667   21,667   10,461
Originated more than five years before current fiscal year 26,861   26,861   29,981
Revolving 89,643   89,643   72,703
Revolving to Term 29,742   29,742   56,716
Total loans 373,331   373,331   303,904
Substandard | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 62,087   62,087   26,638
Originated one year before current year 37,197   37,197   56,423
Originated two years before current year 244,297   244,297   21,401
Originated three years before current year 62,366   62,366   28,983
Originated four years before current year 39,810   39,810   61,186
Originated more than five years before current fiscal year 172,429   172,429   49,558
Revolving 1,018   1,018   0
Revolving to Term 79,285   79,285   48,760
Total loans 698,489   698,489   292,949
Substandard | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 105   105   436
Originated one year before current year 499   499   193
Originated two years before current year 145   145   252
Originated three years before current year 200   200   0
Originated four years before current year 30   30   0
Originated more than five years before current fiscal year 226   226   604
Revolving 694   694   15
Revolving to Term 523   523   1,006
Total loans 2,422   2,422   2,506
Nonaccrual | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 352   352   32
Originated one year before current year 812   812   7,034
Originated two years before current year 2,723   2,723   0
Originated three years before current year 792   792   0
Originated four years before current year 637   637   823
Originated more than five years before current fiscal year 2,354   2,354   3,411
Revolving 242   242   0
Revolving to Term 4,813   4,813   5,461
Total loans 12,725   12,725   16,761
Nonaccrual | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 421   421   0
Originated one year before current year 708   708   21,919
Originated two years before current year 4,267   4,267   10,706
Originated three years before current year 2,881   2,881   1,975
Originated four years before current year 2,763   2,763   1,634
Originated more than five years before current fiscal year 15,942   15,942   8,632
Revolving 0   0   0
Revolving to Term 361   361   1,400
Total loans 27,343   27,343   46,266
Nonaccrual | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   0
Originated one year before current year 262   262   0
Originated two years before current year 434   434   482
Originated three years before current year 347   347   0
Originated four years before current year 67   67   4
Originated more than five years before current fiscal year 1,010   1,010   1,105
Revolving 0   0   0
Revolving to Term 642   642   1,402
Total loans 2,762   2,762   2,993
Doubtful | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 1,460   1,460   0
Originated one year before current year 11,485   11,485   7,261
Originated two years before current year 25,610   25,610   5,925
Originated three years before current year 7,640   7,640   4,875
Originated four years before current year 5,726   5,726   1,742
Originated more than five years before current fiscal year 1,226   1,226   7,211
Revolving 22,294   22,294   0
Revolving to Term 16,979   16,979   0
Total loans 92,420   92,420   27,014
Doubtful | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 7,335   7,335   5,360
Originated one year before current year 5,675   5,675   429
Originated two years before current year 4,858   4,858   30,897
Originated three years before current year 53,679   53,679   2,306
Originated four years before current year 25,556   25,556   37,777
Originated more than five years before current fiscal year 75,276   75,276   35,187
Revolving 0   0   0
Revolving to Term 47,274   47,274   0
Total loans 219,653   219,653   111,956
Doubtful | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   302
Originated one year before current year 231   231   727
Originated two years before current year 642   642   254
Originated three years before current year 301   301   286
Originated four years before current year 15   15   60
Originated more than five years before current fiscal year 1   1   84
Revolving 0   0   0
Revolving to Term 495   495   0
Total loans $ 1,685   $ 1,685   $ 1,713