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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans $ 32,577,834   $ 32,577,834   $ 31,123,641
2023 593   603    
2022 5,360   9,140    
2021 12,829   26,689    
2020 1,868   3,034    
2019 280   7,937    
Prior 736   4,463    
Revolving 1,084   3,395    
Total 22,750 $ 11,440 55,261 $ 20,200  
Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 32,577,834   32,577,834   31,123,641
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 9,333,448   9,333,448   9,508,904
Total 16,705 2,696 37,459 5,919  
Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,662,694   1,662,694   2,473,145
2022 1,866,341   1,866,341   1,851,604
2021 1,156,660   1,156,660   880,723
2020 640,366   640,366   802,628
2019 516,231   516,231   382,993
Prior 587,915   587,915   423,484
Revolving 2,174,229   2,174,229   2,118,835
Revolving to Term 502,659   502,659   365,212
Total loans 9,107,095   9,107,095   9,298,624
2023 0   0    
2022 4,154   6,254    
2021 12,271   23,432    
2020 0   120    
2019 0   6,789    
Prior 63   302    
Revolving 217   562    
Total 16,705   37,459    
Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 13,916,221   13,916,221   12,457,070
Total 2,291 4,772 5,938 5,596  
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,885,506   1,885,506   3,193,582
2022 3,583,898   3,583,898   2,928,035
2021 2,826,313   2,826,313   2,050,913
2020 1,785,467   1,785,467   1,384,735
2019 1,262,289   1,262,289   823,735
Prior 1,454,925   1,454,925   1,139,730
Revolving 83,549   83,549   57,818
Revolving to Term 868,681   868,681   720,200
Total loans 13,750,628   13,750,628   12,298,748
2023 0   0    
2022 0   54    
2021 0   735    
2020 1,744   2,144    
2019 0   0    
Prior 547   3,005    
Revolving 0   0    
Total 2,291   5,938    
BBCC          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 1,049 0 1,171 48  
BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 77,267   77,267   92,738
2022 80,799   80,799   64,973
2021 51,998   51,998   53,229
2020 43,470   43,470   38,138
2019 31,663   31,663   24,464
Prior 15,859   15,859   11,690
Revolving 69,328   69,328   61,565
Revolving to Term 21,562   21,562   21,805
Total loans 391,946   391,946   368,602
2023 499   499    
2022 501   548    
2021 49   77    
2020 0   47    
2019 0   0    
Prior 0   0    
Revolving 0   0    
Total 1,049   1,171    
Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 362,518   362,518   1,327,227
2022 1,508,462   1,508,462   1,946,321
2021 1,864,634   1,864,634   1,826,623
2020 1,736,577   1,736,577   479,402
2019 447,754   447,754   138,086
Prior 776,064   776,064   742,687
Revolving 0   0   7
Revolving to Term 279   279   88
Total loans 6,696,288   6,696,288   6,460,441
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 15   256    
Revolving 0   0    
Total 15 20 256 344  
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 6,696,288   6,696,288   6,460,441
Residential real estate | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 362,518   362,518   1,327,168
2022 1,504,933   1,504,933   1,945,792
2021 1,861,729   1,861,729   1,825,762
2020 1,732,039   1,732,039   478,529
2019 444,411   444,411   136,260
Prior 750,037   750,037   712,175
Revolving 0   0   7
Revolving to Term 279   279   88
Total loans 6,655,946   6,655,946   6,425,781
Residential real estate | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   59
2022 3,529   3,529   529
2021 2,905   2,905   861
2020 4,538   4,538   873
2019 3,343   3,343   1,826
Prior 26,027   26,027   30,512
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 40,342   40,342   34,660
Indirect          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 309,340   309,340   504,758
2022 391,282   391,282   250,481
2021 182,410   182,410   144,910
2020 96,752   96,752   82,835
2019 47,238   47,238   31,788
Prior 20,006   20,006   19,423
Revolving 0   0   0
Revolving to Term 196   196   62
Total loans 1,047,224   1,047,224   1,034,257
2023 75   85    
2022 276   954    
2021 86   640    
2020 12   153    
2019 10   137    
Prior 31   120    
Revolving 0   0    
Total 490 624 2,089 1,636  
Indirect | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,047,224   1,047,224   1,034,257
Indirect | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 309,220   309,220   504,410
2022 390,012   390,012   249,407
2021 181,235   181,235   144,265
2020 96,148   96,148   82,304
2019 46,877   46,877   31,484
Prior 19,666   19,666   19,095
Revolving 0   0   0
Revolving to Term 196   196   62
Total loans 1,043,354   1,043,354   1,031,027
Indirect | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 120   120   348
2022 1,270   1,270   1,074
2021 1,175   1,175   645
2020 604   604   531
2019 361   361   304
Prior 340   340   328
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 3,870   3,870   3,230
Direct          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 84,836   84,836   133,049
2022 100,111   100,111   164,977
2021 108,061   108,061   78,020
2020 54,473   54,473   58,124
2019 35,381   35,381   45,626
Prior 91,081   91,081   60,738
Revolving 63,883   63,883   87,627
Revolving to Term 4,863   4,863   1,025
Total loans 542,689   542,689   629,186
2023 19   19    
2022 429   1,330    
2021 423   1,805    
2020 112   570    
2019 270   1,011    
Prior 60   450    
Revolving 867   2,833    
Total 2,180 3,299 8,018 6,550  
Direct | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 542,689   542,689   629,186
Direct | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 84,749   84,749   132,934
2022 99,625   99,625   164,126
2021 107,539   107,539   77,406
2020 54,070   54,070   57,919
2019 35,065   35,065   45,299
Prior 87,207   87,207   59,212
Revolving 63,877   63,877   87,622
Revolving to Term 4,852   4,852   671
Total loans 536,984   536,984   625,189
Direct | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 87   87   115
2022 486   486   851
2021 522   522   614
2020 403   403   205
2019 316   316   327
Prior 3,874   3,874   1,526
Revolving 6   6   5
Revolving to Term 11   11   354
Total loans 5,705   5,705   3,997
Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1   1   1,085
2022 716   716   1,056
2021 606   606   2,015
2020 893   893   1,943
2019 1,501   1,501   1,777
Prior 10,546   10,546   15,954
Revolving 996,489   996,489   991,699
Revolving to Term 31,212   31,212   18,254
Total loans 1,041,964   1,041,964   1,033,783
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 20   330    
Revolving 0   0    
Total 20 $ 29 330 $ 107  
Home equity | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,041,964   1,041,964   1,033,783
Home equity | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1   1   919
2022 692   692   896
2021 387   387   1,849
2020 690   690   1,497
2019 743   743   983
Prior 5,736   5,736   11,646
Revolving 994,797   994,797   990,001
Revolving to Term 23,918   23,918   14,792
Total loans 1,026,964   1,026,964   1,022,583
Home equity | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   166
2022 24   24   160
2021 219   219   166
2020 203   203   446
2019 758   758   794
Prior 4,810   4,810   4,308
Revolving 1,692   1,692   1,698
Revolving to Term 7,294   7,294   3,462
Total loans 15,000   15,000   11,200
Pass | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,615,716   1,615,716   2,388,618
2022 1,690,168   1,690,168   1,754,364
2021 1,095,758   1,095,758   796,340
2020 553,187   553,187   738,208
2019 479,907   479,907   362,986
Prior 501,610   501,610   388,617
Revolving 2,000,147   2,000,147   1,988,763
Revolving to Term 454,995   454,995   329,119
Total loans 8,391,488   8,391,488   8,747,015
Pass | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,805,852   1,805,852   3,066,960
2022 3,432,536   3,432,536   2,828,758
2021 2,715,562   2,715,562   1,989,000
2020 1,734,359   1,734,359   1,219,025
2019 1,117,895   1,117,895   675,572
Prior 1,273,742   1,273,742   1,018,719
Revolving 73,590   73,590   57,818
Revolving to Term 796,442   796,442   689,553
Total loans 12,949,978   12,949,978   11,545,405
Pass | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 74,658   74,658   90,341
2022 76,281   76,281   64,161
2021 49,463   49,463   52,304
2020 42,980   42,980   36,868
2019 30,085   30,085   23,618
Prior 14,488   14,488   11,333
Revolving 66,281   66,281   60,016
Revolving to Term 18,582   18,582   18,881
Total loans 372,818   372,818   357,522
Criticized | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 27,469   27,469   40,856
2022 110,893   110,893   30,661
2021 21,107   21,107   63,557
2020 46,241   46,241   33,490
2019 22,674   22,674   9,195
Prior 54,738   54,738   5,312
Revolving 107,105   107,105   61,036
Revolving to Term 32,247   32,247   4,327
Total loans 422,474   422,474   248,434
Criticized | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 58,440   58,440   75,306
2022 62,461   62,461   34,422
2021 42,128   42,128   22,569
2020 28,716   28,716   82,637
2019 27,978   27,978   86,504
Prior 90,549   90,549   56,864
Revolving 9,959   9,959   0
Revolving to Term 21,023   21,023   23,282
Total loans 341,254   341,254   381,584
Criticized | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 2,295   2,295   1,504
2022 2,469   2,469   525
2021 1,114   1,114   368
2020 76   76   692
2019 1,110   1,110   353
Prior 0   0   0
Revolving 2,470   2,470   1,006
Revolving to Term 2,264   2,264   1,603
Total loans 11,798   11,798   6,051
Substandard | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 19,509   19,509   37,223
2022 40,694   40,694   47,522
2021 32,135   32,135   16,540
2020 38,892   38,892   22,925
2019 9,970   9,970   4,844
Prior 20,431   20,431   21,204
Revolving 66,977   66,977   67,402
Revolving to Term 15,417   15,417   25,143
Total loans 244,025   244,025   242,803
Substandard | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 21,214   21,214   46,231
2022 84,269   84,269   16,928
2021 23,589   23,589   24,319
2020 16,822   16,822   78,468
2019 78,165   78,165   57,824
Prior 41,313   41,313   21,591
Revolving 0   0   0
Revolving to Term 50,424   50,424   4,108
Total loans 315,796   315,796   249,469
Substandard | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 98   98   811
2022 733   733   143
2021 619   619   0
2020 24   24   421
2019 401   401   0
Prior 1,196   1,196   0
Revolving 100   100   543
Revolving to Term 438   438   682
Total loans 3,609   3,609   2,600
Nonaccrual | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   3,627
2022 5,748   5,748   1,453
2021 2,034   2,034   566
2020 284   284   0
2019 2,718   2,718   0
Prior 0   0   0
Revolving 0   0   1,634
Revolving to Term 0   0   6,623
Total loans 10,784   10,784   13,903
Nonaccrual | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   3,151
2022 2,983   2,983   9,541
2021 11,470   11,470   5,014
2020 1,428   1,428   0
2019 52   52   2,312
Prior 11,385   11,385   22,155
Revolving 0   0   0
Revolving to Term 792   792   3,257
Total loans 28,110   28,110   45,430
Nonaccrual | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 216   216   42
2022 451   451   37
2021 310   310   118
2020 340   340   0
2019 0   0   429
Prior 87   87   284
Revolving 477   477   0
Revolving to Term 278   278   639
Total loans 2,159   2,159   1,549
Doubtful | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   2,821
2022 18,838   18,838   17,604
2021 5,626   5,626   3,720
2020 1,762   1,762   8,005
2019 962   962   5,968
Prior 11,136   11,136   8,351
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 38,324   38,324   46,469
Doubtful | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   1,934
2022 1,649   1,649   38,386
2021 33,564   33,564   10,011
2020 4,142   4,142   4,605
2019 38,199   38,199   1,523
Prior 37,936   37,936   20,401
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 115,490   115,490   76,860
Doubtful | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   40
2022 865   865   107
2021 492   492   439
2020 50   50   157
2019 67   67   64
Prior 88   88   73
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans $ 1,562   $ 1,562   $ 880