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Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans $ 32,432,473   $ 32,432,473   $ 31,123,641
2023 10   10    
2022 2,741   3,780    
2021 6,643   13,860    
2020 387   1,166    
2019 430   7,657    
Prior 3,139   3,727    
Revolving 981   2,311    
Total 14,331 $ 4,096 32,511 $ 8,760  
Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 32,432,473   32,432,473   31,123,641
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 9,698,241   9,698,241   9,508,904
Total 8,331 1,344 20,754 3,223  
Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,154,520   1,154,520   2,473,145
2022 1,984,931   1,984,931   1,851,604
2021 1,372,242   1,372,242   880,723
2020 734,060   734,060   802,628
2019 640,725   640,725   382,993
Prior 739,650   739,650   423,484
Revolving 2,313,834   2,313,834   2,118,835
Revolving to Term 530,865   530,865   365,212
Total loans 9,470,827   9,470,827   9,298,624
2023 0   0    
2022 2,100   2,100    
2021 5,931   11,161    
2020 120   120    
2019 0   6,789    
Prior 0   239    
Revolving 180   345    
Total 8,331   20,754    
Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 13,450,209   13,450,209   12,457,070
Total 2,458 318 3,647 824  
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,231,891   1,231,891   3,193,582
2022 3,441,886   3,441,886   2,928,035
2021 2,890,052   2,890,052   2,050,913
2020 1,914,989   1,914,989   1,384,735
2019 1,257,962   1,257,962   823,735
Prior 1,708,599   1,708,599   1,139,730
Revolving 88,467   88,467   57,818
Revolving to Term 753,522   753,522   720,200
Total loans 13,287,368   13,287,368   12,298,748
2023 0   0    
2022 0   54    
2021 0   735    
2020 0   400    
2019 0   0    
Prior 2,458   2,458    
Revolving 0   0    
Total 2,458   3,647    
BBCC          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 94 20 122 48  
BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 53,654   53,654   92,738
2022 80,494   80,494   64,973
2021 55,320   55,320   53,229
2020 44,970   44,970   38,138
2019 33,761   33,761   24,464
Prior 30,366   30,366   11,690
Revolving 71,927   71,927   61,565
Revolving to Term 19,763   19,763   21,805
Total loans 390,255   390,255   368,602
2023 0   0    
2022 47   47    
2021 0   28    
2020 47   47    
2019 0   0    
Prior 0   0    
Revolving 0   0    
Total 94   122    
Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 261,285   261,285   1,327,227
2022 1,482,818   1,482,818   1,946,321
2021 1,951,232   1,951,232   1,826,623
2020 1,714,093   1,714,093   479,402
2019 462,629   462,629   138,086
Prior 812,280   812,280   742,687
Revolving 0   0   7
Revolving to Term 143   143   88
Total loans 6,684,480   6,684,480   6,460,441
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 218   241    
Revolving 0   0    
Total 218 137 241 324  
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 6,684,480   6,684,480   6,460,441
Residential real estate | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 261,285   261,285   1,327,168
2022 1,480,926   1,480,926   1,945,792
2021 1,948,505   1,948,505   1,825,762
2020 1,709,893   1,709,893   478,529
2019 459,251   459,251   136,260
Prior 785,089   785,089   712,175
Revolving 0   0   7
Revolving to Term 143   143   88
Total loans 6,645,092   6,645,092   6,425,781
Residential real estate | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   59
2022 1,892   1,892   529
2021 2,727   2,727   861
2020 4,200   4,200   873
2019 3,378   3,378   1,826
Prior 27,191   27,191   30,512
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 39,388   39,388   34,660
Indirect          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 187,709   187,709   504,758
2022 426,929   426,929   250,481
2021 203,028   203,028   144,910
2020 99,824   99,824   82,835
2019 57,851   57,851   31,788
Prior 27,863   27,863   19,423
Revolving 0   0   0
Revolving to Term 83   83   62
Total loans 1,003,287   1,003,287   1,034,257
2023 10   10    
2022 164   678    
2021 124   554    
2020 48   141    
2019 16   127    
Prior 40   89    
Revolving 0   0    
Total 402 528 1,599 1,012  
Indirect | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,003,287   1,003,287   1,034,257
Indirect | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 187,644   187,644   504,410
2022 425,822   425,822   249,407
2021 202,230   202,230   144,265
2020 98,742   98,742   82,304
2019 57,413   57,413   31,484
Prior 27,397   27,397   19,095
Revolving 0   0   0
Revolving to Term 83   83   62
Total loans 999,331   999,331   1,031,027
Indirect | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 65   65   348
2022 1,107   1,107   1,074
2021 798   798   645
2020 1,082   1,082   531
2019 438   438   304
Prior 466   466   328
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 3,956   3,956   3,230
Direct          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 53,799   53,799   133,049
2022 110,382   110,382   164,977
2021 121,630   121,630   78,020
2020 77,731   77,731   58,124
2019 41,972   41,972   45,626
Prior 84,125   84,125   60,738
Revolving 74,953   74,953   87,627
Revolving to Term 1,358   1,358   1,025
Total loans 565,950   565,950   629,186
2023 0   0    
2022 430   901    
2021 588   1,382    
2020 172   458    
2019 414   741    
Prior 195   390    
Revolving 801   1,966    
Total 2,600 1,722 5,838 3,251  
Direct | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 565,950   565,950   629,186
Direct | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 53,778   53,778   132,934
2022 110,107   110,107   164,126
2021 121,141   121,141   77,406
2020 77,169   77,169   57,919
2019 41,509   41,509   45,299
Prior 80,155   80,155   59,212
Revolving 74,945   74,945   87,622
Revolving to Term 1,348   1,348   671
Total loans 560,152   560,152   625,189
Direct | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 21   21   115
2022 275   275   851
2021 489   489   614
2020 562   562   205
2019 463   463   327
Prior 3,970   3,970   1,526
Revolving 8   8   5
Revolving to Term 10   10   354
Total loans 5,798   5,798   3,997
Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   1,085
2022 1,379   1,379   1,056
2021 973   973   2,015
2020 941   941   1,943
2019 2,000   2,000   1,777
Prior 11,349   11,349   15,954
Revolving 990,630   990,630   991,699
Revolving to Term 23,034   23,034   18,254
Total loans 1,030,306   1,030,306   1,033,783
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 228   310    
Revolving 0   0    
Total 228 $ 27 310 $ 78  
Home equity | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,030,306   1,030,306   1,033,783
Home equity | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   919
2022 1,328   1,328   896
2021 843   843   1,849
2020 859   859   1,497
2019 943   943   983
Prior 6,573   6,573   11,646
Revolving 988,669   988,669   990,001
Revolving to Term 16,859   16,859   14,792
Total loans 1,016,074   1,016,074   1,022,583
Home equity | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   166
2022 51   51   160
2021 130   130   166
2020 82   82   446
2019 1,057   1,057   794
Prior 4,776   4,776   4,308
Revolving 1,961   1,961   1,698
Revolving to Term 6,175   6,175   3,462
Total loans 14,232   14,232   11,200
Pass | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,108,984   1,108,984   2,388,618
2022 1,860,049   1,860,049   1,754,364
2021 1,307,700   1,307,700   796,340
2020 671,792   671,792   738,208
2019 604,875   604,875   362,986
Prior 673,184   673,184   388,617
Revolving 2,185,539   2,185,539   1,988,763
Revolving to Term 465,649   465,649   329,119
Total loans 8,877,772   8,877,772   8,747,015
Pass | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 1,188,882   1,188,882   3,066,960
2022 3,335,715   3,335,715   2,828,758
2021 2,791,366   2,791,366   1,989,000
2020 1,852,690   1,852,690   1,219,025
2019 1,083,211   1,083,211   675,572
Prior 1,511,576   1,511,576   1,018,719
Revolving 84,574   84,574   57,818
Revolving to Term 677,072   677,072   689,553
Total loans 12,525,086   12,525,086   11,545,405
Pass | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 52,620   52,620   90,341
2022 77,831   77,831   64,161
2021 53,068   53,068   52,304
2020 44,433   44,433   36,868
2019 32,200   32,200   23,618
Prior 28,305   28,305   11,333
Revolving 69,107   69,107   60,016
Revolving to Term 16,637   16,637   18,881
Total loans 374,201   374,201   357,522
Criticized | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 28,284   28,284   40,856
2022 84,240   84,240   30,661
2021 15,092   15,092   63,557
2020 23,548   23,548   33,490
2019 29,772   29,772   9,195
Prior 32,376   32,376   5,312
Revolving 74,437   74,437   61,036
Revolving to Term 25,524   25,524   4,327
Total loans 313,273   313,273   248,434
Criticized | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 28,324   28,324   75,306
2022 30,372   30,372   34,422
2021 31,377   31,377   22,569
2020 32,238   32,238   82,637
2019 54,738   54,738   86,504
Prior 88,116   88,116   56,864
Revolving 3,893   3,893   0
Revolving to Term 23,353   23,353   23,282
Total loans 292,411   292,411   381,584
Criticized | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 987   987   1,504
2022 1,445   1,445   525
2021 1,081   1,081   368
2020 360   360   692
2019 1,045   1,045   353
Prior 483   483   0
Revolving 1,836   1,836   1,006
Revolving to Term 1,626   1,626   1,603
Total loans 8,863   8,863   6,051
Substandard | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 17,252   17,252   37,223
2022 16,246   16,246   47,522
2021 36,914   36,914   16,540
2020 36,303   36,303   22,925
2019 4,671   4,671   4,844
Prior 22,508   22,508   21,204
Revolving 52,794   52,794   67,402
Revolving to Term 37,482   37,482   25,143
Total loans 224,170   224,170   242,803
Substandard | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 14,685   14,685   46,231
2022 71,131   71,131   16,928
2021 17,505   17,505   24,319
2020 19,748   19,748   78,468
2019 79,998   79,998   57,824
Prior 44,060   44,060   21,591
Revolving 0   0   0
Revolving to Term 49,825   49,825   4,108
Total loans 296,952   296,952   249,469
Substandard | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 10   10   811
2022 497   497   143
2021 629   629   0
2020 49   49   421
2019 226   226   0
Prior 836   836   0
Revolving 484   484   543
Revolving to Term 856   856   682
Total loans 3,587   3,587   2,600
Nonaccrual | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   3,627
2022 349   349   1,453
2021 0   0   566
2020 585   585   0
2019 824   824   0
Prior 6,681   6,681   0
Revolving 1,064   1,064   1,634
Revolving to Term 2,210   2,210   6,623
Total loans 11,713   11,713   13,903
Nonaccrual | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   3,151
2022 866   866   9,541
2021 18,463   18,463   5,014
2020 1,064   1,064   0
2019 456   456   2,312
Prior 16,081   16,081   22,155
Revolving 0   0   0
Revolving to Term 3,272   3,272   3,257
Total loans 40,202   40,202   45,430
Nonaccrual | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 37   37   42
2022 313   313   37
2021 323   323   118
2020 128   128   0
2019 235   235   429
Prior 668   668   284
Revolving 0   0   0
Revolving to Term 644   644   639
Total loans 2,348   2,348   1,549
Doubtful | Commercial | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   2,821
2022 24,047   24,047   17,604
2021 12,536   12,536   3,720
2020 1,832   1,832   8,005
2019 583   583   5,968
Prior 4,901   4,901   8,351
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 43,899   43,899   46,469
Doubtful | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   1,934
2022 3,802   3,802   38,386
2021 31,341   31,341   10,011
2020 9,249   9,249   4,605
2019 39,559   39,559   1,523
Prior 48,766   48,766   20,401
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 132,717   132,717   76,860
Doubtful | BBCC | Segment Portfolio Reclassification, Adjusted Balance          
Financing Receivable, Credit Quality Indicator [Line Items]          
2023 0   0   40
2022 408   408   107
2021 219   219   439
2020 0   0   157
2019 55   55   64
Prior 74   74   73
Revolving 500   500   0
Revolving to Term 0   0   0
Total loans $ 1,256   $ 1,256   $ 880