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Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans $ 33,623,319   $ 32,991,927
2024 0 $ 0  
2023 486 1,039  
2022 4,605 7,217  
2021 2,997 779  
2020 154 7,227  
Prior 4,774 588  
Revolving 1,004 1,330  
Total 14,020 18,180  
Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 33,623,319   32,991,927
Commercial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 9,648,269   9,512,230
Total 3,659 12,423  
Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 417,968   1,873,630
Originated one year before current year 1,803,036   1,719,159
Originated two years before current year 1,506,225   1,039,832
Originated three years before current year 930,518   600,282
Originated four years before current year 553,494   489,693
Originated more than five years before current fiscal year 881,103   583,939
Revolving 2,346,644   2,214,453
Revolving to Term 977,236   758,478
Total loans 9,416,224   9,279,466
2024 0 0  
2023 0 0  
2022 3,481 5,230  
2021 33 0  
2020 8 6,789  
Prior 4 239  
Revolving 133 165  
Total 3,659 12,423  
Commercial real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 14,653,958   14,140,629
Total 6,641 1,189  
Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 469,176   2,279,487
Originated one year before current year 2,341,851   3,664,419
Originated two years before current year 3,835,941   2,695,350
Originated three years before current year 2,645,245   1,636,367
Originated four years before current year 1,556,877   1,163,055
Originated more than five years before current fiscal year 2,397,627   1,350,392
Revolving 106,526   107,225
Revolving to Term 1,128,056   1,075,276
Total loans 14,481,299   13,971,571
2024 0 0  
2023 0 54  
2022 0 735  
2021 2,176 400  
2020 0 0  
Prior 4,465 0  
Revolving 0 0  
Total 6,641 1,189  
BBCC      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 76 28  
BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 20,400   81,840
Originated one year before current year 83,870   65,503
Originated two years before current year 64,887   46,152
Originated three years before current year 42,844   39,072
Originated four years before current year 36,870   28,622
Originated more than five years before current fiscal year 43,680   21,170
Revolving 67,599   70,966
Revolving to Term 44,554   48,497
Total loans 404,704   401,822
2024 0 0  
2023 0 0  
2022 76 28  
2021 0 0  
2020 0 0  
Prior 0 0  
Revolving 0 0  
Total 76 28  
Residential real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 52,693   453,859
Originated one year before current year 476,603   1,513,234
Originated two years before current year 1,501,054   1,840,082
Originated three years before current year 1,863,161   1,708,506
Originated four years before current year 1,618,914   434,861
Originated more than five years before current fiscal year 1,148,637   748,622
Revolving 74   0
Revolving to Term 243   279
Total loans 6,661,379   6,699,443
2024 0 0  
2023 0 0  
2022 0 0  
2021 0 0  
2020 0 0  
Prior 0 23  
Revolving 0 0  
Total 0 23  
Residential real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 6,661,379   6,699,443
Residential real estate | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 52,693   453,743
Originated one year before current year 475,237   1,508,671
Originated two years before current year 1,494,593   1,836,078
Originated three years before current year 1,857,010   1,705,131
Originated four years before current year 1,615,143   430,783
Originated more than five years before current fiscal year 1,119,364   722,987
Revolving 74   0
Revolving to Term 243   279
Total loans 6,614,357   6,657,672
Residential real estate | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   116
Originated one year before current year 1,366   4,563
Originated two years before current year 6,461   4,004
Originated three years before current year 6,151   3,375
Originated four years before current year 3,771   4,078
Originated more than five years before current fiscal year 29,273   25,635
Revolving 0   0
Revolving to Term 0   0
Total loans 47,022   41,771
Indirect      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 139,067   393,741
Originated one year before current year 374,428   357,294
Originated two years before current year 323,505   163,942
Originated three years before current year 144,958   83,418
Originated four years before current year 70,207   38,285
Originated more than five years before current fiscal year 39,618   14,106
Revolving 0   0
Revolving to Term 215   196
Total loans 1,091,998   1,050,982
2024 0 0  
2023 370 514  
2022 472 430  
2021 225 93  
2020 33 111  
Prior 38 49  
Revolving 0 0  
Total 1,138 1,197  
Indirect | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 1,091,998   1,050,982
Indirect | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 139,067   393,369
Originated one year before current year 373,733   355,822
Originated two years before current year 321,837   162,735
Originated three years before current year 143,848   82,871
Originated four years before current year 69,757   37,967
Originated more than five years before current fiscal year 39,133   13,815
Revolving 0   0
Revolving to Term 215   196
Total loans 1,087,590   1,046,775
Indirect | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   372
Originated one year before current year 695   1,472
Originated two years before current year 1,668   1,207
Originated three years before current year 1,110   547
Originated four years before current year 450   318
Originated more than five years before current fiscal year 485   291
Revolving 0   0
Revolving to Term 0   0
Total loans 4,408   4,207
Direct      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 19,941   109,439
Originated one year before current year 92,714   90,841
Originated two years before current year 123,861   93,008
Originated three years before current year 82,561   48,947
Originated four years before current year 29,906   29,869
Originated more than five years before current fiscal year 77,255   71,001
Revolving 79,446   75,204
Revolving to Term 621   4,863
Total loans 506,305   523,172
2024 0 0  
2023 116 471  
2022 576 794  
2021 529 286  
2020 113 327  
Prior 223 195  
Revolving 871 1,165  
Total 2,428 3,238  
Direct | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 506,305   523,172
Direct | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 19,941   109,372
Originated one year before current year 92,696   90,310
Originated two years before current year 123,339   92,491
Originated three years before current year 82,175   48,387
Originated four years before current year 29,248   29,659
Originated more than five years before current fiscal year 73,369   67,129
Revolving 79,443   75,080
Revolving to Term 611   4,852
Total loans 500,822   517,280
Direct | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   67
Originated one year before current year 18   531
Originated two years before current year 522   517
Originated three years before current year 386   560
Originated four years before current year 658   210
Originated more than five years before current fiscal year 3,886   3,872
Revolving 3   124
Revolving to Term 10   11
Total loans 5,483   5,892
Home equity      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   290
Originated one year before current year 3   474
Originated two years before current year 403   488
Originated three years before current year 430   544
Originated four years before current year 242   1,420
Originated more than five years before current fiscal year 9,599   8,810
Revolving 1,016,102   1,022,233
Revolving to Term 34,631   31,212
Total loans 1,061,410   1,065,471
2024 0 0  
2023 0 0  
2022 0 0  
2021 34 0  
2020 0 0  
Prior 44 82  
Revolving 0 0  
Total 78 $ 82  
Home equity | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 1,061,410   1,065,471
Home equity | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   290
Originated one year before current year 2   164
Originated two years before current year 396   160
Originated three years before current year 299   140
Originated four years before current year 0   679
Originated more than five years before current fiscal year 4,911   4,483
Revolving 1,012,484   1,019,389
Revolving to Term 25,360   23,918
Total loans 1,043,452   1,049,223
Home equity | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   0
Originated one year before current year 1   310
Originated two years before current year 7   328
Originated three years before current year 131   404
Originated four years before current year 242   741
Originated more than five years before current fiscal year 4,688   4,327
Revolving 3,618   2,844
Revolving to Term 9,271   7,294
Total loans 17,958   16,248
Pass | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 410,201   1,826,289
Originated one year before current year 1,750,748   1,573,669
Originated two years before current year 1,366,887   985,964
Originated three years before current year 874,692   520,883
Originated four years before current year 478,725   450,911
Originated more than five years before current fiscal year 799,327   495,979
Revolving 2,162,262   2,051,985
Revolving to Term 891,572   651,953
Total loans 8,734,414   8,557,633
Pass | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 461,150   2,177,841
Originated one year before current year 2,274,374   3,515,702
Originated two years before current year 3,680,370   2,563,638
Originated three years before current year 2,438,872   1,576,044
Originated four years before current year 1,479,830   1,010,351
Originated more than five years before current fiscal year 2,057,232   1,161,119
Revolving 98,657   103,332
Revolving to Term 988,203   960,386
Total loans 13,478,688   13,068,413
Pass | BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 20,205   81,102
Originated one year before current year 82,522   64,583
Originated two years before current year 63,561   44,307
Originated three years before current year 41,025   38,086
Originated four years before current year 35,964   27,557
Originated more than five years before current fiscal year 41,883   19,028
Revolving 65,020   68,807
Revolving to Term 31,595   33,361
Total loans 381,775   376,831
Criticized | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 1,087   20,038
Originated one year before current year 23,697   90,031
Originated two years before current year 66,438   19,953
Originated three years before current year 16,667   36,906
Originated four years before current year 36,943   25,756
Originated more than five years before current fiscal year 50,076   47,357
Revolving 123,117   89,765
Revolving to Term 15,698   44,348
Total loans 333,723   374,154
Criticized | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 7,746   69,648
Originated one year before current year 51,975   69,946
Originated two years before current year 48,071   68,708
Originated three years before current year 132,220   27,059
Originated four years before current year 38,258   52,107
Originated more than five years before current fiscal year 112,902   95,896
Revolving 7,869   3,893
Revolving to Term 80,231   64,730
Total loans 479,272   451,987
Criticized | BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 122   0
Originated one year before current year 0   0
Originated two years before current year 571   857
Originated three years before current year 872   700
Originated four years before current year 528   1,001
Originated more than five years before current fiscal year 324   349
Revolving 2,004   2,144
Revolving to Term 10,003   12,728
Total loans 14,424   17,779
Substandard | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 6,680   27,271
Originated one year before current year 8,148   41,164
Originated two years before current year 37,790   27,990
Originated three years before current year 32,816   37,618
Originated four years before current year 33,303   10,461
Originated more than five years before current fiscal year 27,990   29,981
Revolving 60,662   72,703
Revolving to Term 67,681   56,716
Total loans 275,070   303,904
Substandard | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 280   26,638
Originated one year before current year 10,079   56,423
Originated two years before current year 66,381   21,401
Originated three years before current year 37,954   28,983
Originated four years before current year 33,966   61,186
Originated more than five years before current fiscal year 142,537   49,558
Revolving 0   0
Revolving to Term 57,157   48,760
Total loans 348,354   292,949
Substandard | BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 73   436
Originated one year before current year 444   193
Originated two years before current year 191   252
Originated three years before current year 248   0
Originated four years before current year 126   0
Originated more than five years before current fiscal year 82   604
Revolving 575   15
Revolving to Term 994   1,006
Total loans 2,733   2,506
Nonaccrual | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   32
Originated one year before current year 8,206   7,034
Originated two years before current year 0   0
Originated three years before current year 0   0
Originated four years before current year 0   823
Originated more than five years before current fiscal year 1,623   3,411
Revolving 603   0
Revolving to Term 2,285   5,461
Total loans 12,717   16,761
Nonaccrual | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   0
Originated one year before current year 206   21,919
Originated two years before current year 19,344   10,706
Originated three years before current year 11,850   1,975
Originated four years before current year 2,599   1,634
Originated more than five years before current fiscal year 19,159   8,632
Revolving 0   0
Revolving to Term 2,465   1,400
Total loans 55,623   46,266
Nonaccrual | BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   0
Originated one year before current year 0   0
Originated two years before current year 0   482
Originated three years before current year 470   0
Originated four years before current year 0   4
Originated more than five years before current fiscal year 1,169   1,105
Revolving 0   0
Revolving to Term 1,962   1,402
Total loans 3,601   2,993
Doubtful | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   0
Originated one year before current year 12,237   7,261
Originated two years before current year 35,110   5,925
Originated three years before current year 6,343   4,875
Originated four years before current year 4,523   1,742
Originated more than five years before current fiscal year 2,087   7,211
Revolving 0   0
Revolving to Term 0   0
Total loans 60,300   27,014
Doubtful | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   5,360
Originated one year before current year 5,217   429
Originated two years before current year 21,775   30,897
Originated three years before current year 24,349   2,306
Originated four years before current year 2,224   37,777
Originated more than five years before current fiscal year 65,797   35,187
Revolving 0   0
Revolving to Term 0   0
Total loans 119,362   111,956
Doubtful | BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   302
Originated one year before current year 904   727
Originated two years before current year 564   254
Originated three years before current year 229   286
Originated four years before current year 252   60
Originated more than five years before current fiscal year 222   84
Revolving 0   0
Revolving to Term 0   0
Total loans $ 2,171   $ 1,713