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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans $ 36,150,513   $ 36,150,513   $ 32,991,927
2024 129 $ 10 129 $ 10  
2023 3,573 2,741 4,059 3,780  
2022 7,096 6,643 11,701 13,860  
2021 1,335 387 4,332 1,166  
2020 334 430 488 7,657  
Prior 3,508 3,139 8,282 3,727  
Revolving 1,066 981 2,070 2,311  
Total 17,041 14,331 31,061 32,511  
Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 36,150,513   36,150,513   32,991,927
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 10,332,631   10,332,631   9,512,230
Total 9,927 8,331 13,586 20,754  
Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 991,464   991,464   1,873,630
Originated one year before current year 1,844,730   1,844,730   1,719,159
Originated two years before current year 1,570,116   1,570,116   1,039,832
Originated three years before current year 920,119   920,119   600,282
Originated four years before current year 577,515   577,515   489,693
Originated more than five years before current fiscal year 791,569   791,569   583,939
Revolving 2,791,799   2,791,799   2,214,453
Revolving to Term 614,915   614,915   758,478
Total loans 10,102,227   10,102,227   9,279,466
2024 0 0 0 0  
2023 2,358 2,100 2,358 2,100  
2022 6,149 5,931 9,630 11,161  
2021 389 120 422 120  
2020 43 0 51 6,789  
Prior 566 0 570 239  
Revolving 422 180 555 345  
Total 9,927 8,331 13,586 20,754  
Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 16,016,958   16,016,958   14,140,629
Total 3,101 2,458 9,742 3,647  
Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 1,160,906   1,160,906   2,279,487
Originated one year before current year 2,531,251   2,531,251   3,664,419
Originated two years before current year 4,288,047   4,288,047   2,695,350
Originated three years before current year 2,615,051   2,615,051   1,636,367
Originated four years before current year 1,542,998   1,542,998   1,163,055
Originated more than five years before current fiscal year 2,523,686   2,523,686   1,350,392
Revolving 186,581   186,581   107,225
Revolving to Term 992,824   992,824   1,075,276
Total loans 15,841,344   15,841,344   13,971,571
2024 0 0 0 0  
2023 0 0 0 54  
2022 23 0 23 735  
2021 468 0 2,644 400  
2020 0 0 0 0  
Prior 2,610 2,458 7,075 2,458  
Revolving 0 0 0 0  
Total 3,101 2,458 9,742 3,647  
BBCC          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 935 94 1,011 122  
BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 44,240   44,240   81,840
Originated one year before current year 90,352   90,352   65,503
Originated two years before current year 64,841   64,841   46,152
Originated three years before current year 41,082   41,082   39,072
Originated four years before current year 35,112   35,112   28,622
Originated more than five years before current fiscal year 39,654   39,654   21,170
Revolving 68,533   68,533   70,966
Revolving to Term 22,204   22,204   48,497
Total loans 406,018   406,018   401,822
2024 0 0 0 0  
2023 605 47 605 47  
2022 153 0 229 28  
2021 35 47 35 47  
2020 112 0 112 0  
Prior 30 0 30 0  
Revolving 0 0 0 0  
Total 935 94 1,011 122  
Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 211,657   211,657   453,859
Originated one year before current year 498,339   498,339   1,513,234
Originated two years before current year 1,510,461   1,510,461   1,840,082
Originated three years before current year 1,884,983   1,884,983   1,708,506
Originated four years before current year 1,646,023   1,646,023   434,861
Originated more than five years before current fiscal year 1,143,145   1,143,145   748,622
Revolving 67   67   0
Revolving to Term 282   282   279
Total loans 6,894,957   6,894,957   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 0 218 0 241  
Revolving 0 0 0 0  
Total 0 218 0 241  
Residential real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 6,894,957   6,894,957   6,699,443
Residential real estate | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 211,657   211,657   453,743
Originated one year before current year 496,415   496,415   1,508,671
Originated two years before current year 1,502,442   1,502,442   1,836,078
Originated three years before current year 1,879,448   1,879,448   1,705,131
Originated four years before current year 1,642,226   1,642,226   430,783
Originated more than five years before current fiscal year 1,114,416   1,114,416   722,987
Revolving 67   67   0
Revolving to Term 282   282   279
Total loans 6,846,953   6,846,953   6,657,672
Residential real estate | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   116
Originated one year before current year 1,924   1,924   4,563
Originated two years before current year 8,019   8,019   4,004
Originated three years before current year 5,535   5,535   3,375
Originated four years before current year 3,797   3,797   4,078
Originated more than five years before current fiscal year 28,729   28,729   25,635
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 48,004   48,004   41,771
Indirect          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 252,830   252,830   393,741
Originated one year before current year 342,669   342,669   357,294
Originated two years before current year 291,126   291,126   163,942
Originated three years before current year 126,886   126,886   83,418
Originated four years before current year 58,775   58,775   38,285
Originated more than five years before current fiscal year 29,299   29,299   14,106
Revolving 0   0   0
Revolving to Term 0   0   196
Total loans 1,101,585   1,101,585   1,050,982
2024 54 10 54 10  
2023 531 164 901 678  
2022 377 124 849 554  
2021 96 48 321 141  
2020 6 16 39 127  
Prior 20 40 58 89  
Revolving 0 0 0 0  
Total 1,084 402 2,222 1,599  
Indirect | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,101,585   1,101,585   1,050,982
Indirect | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 252,797   252,797   393,369
Originated one year before current year 341,949   341,949   355,822
Originated two years before current year 289,675   289,675   162,735
Originated three years before current year 125,544   125,544   82,871
Originated four years before current year 58,368   58,368   37,967
Originated more than five years before current fiscal year 28,872   28,872   13,815
Revolving 0   0   0
Revolving to Term 0   0   196
Total loans 1,097,205   1,097,205   1,046,775
Indirect | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 33   33   372
Originated one year before current year 720   720   1,472
Originated two years before current year 1,451   1,451   1,207
Originated three years before current year 1,342   1,342   547
Originated four years before current year 407   407   318
Originated more than five years before current fiscal year 427   427   291
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 4,380   4,380   4,207
Direct          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 25,532   25,532   109,439
Originated one year before current year 84,281   84,281   90,841
Originated two years before current year 66,820   66,820   93,008
Originated three years before current year 64,422   64,422   48,947
Originated four years before current year 24,974   24,974   29,869
Originated more than five years before current fiscal year 65,015   65,015   71,001
Revolving 96,492   96,492   75,204
Revolving to Term 1,890   1,890   4,863
Total loans 429,426   429,426   523,172
2024 75 0 75 0  
2023 79 430 195 901  
2022 394 588 970 1,382  
2021 347 172 876 458  
2020 173 414 286 741  
Prior 172 195 395 390  
Revolving 644 801 1,515 1,966  
Total 1,884 2,600 4,312 5,838  
Direct | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 429,426   429,426   523,172
Direct | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 25,512   25,512   109,372
Originated one year before current year 84,213   84,213   90,310
Originated two years before current year 66,009   66,009   92,491
Originated three years before current year 62,213   62,213   48,387
Originated four years before current year 24,375   24,375   29,659
Originated more than five years before current fiscal year 63,076   63,076   67,129
Revolving 96,462   96,462   75,080
Revolving to Term 1,878   1,878   4,852
Total loans 423,738   423,738   517,280
Direct | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 20   20   67
Originated one year before current year 68   68   531
Originated two years before current year 811   811   517
Originated three years before current year 2,209   2,209   560
Originated four years before current year 599   599   210
Originated more than five years before current fiscal year 1,939   1,939   3,872
Revolving 30   30   124
Revolving to Term 12   12   11
Total loans 5,688   5,688   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 265   265   488
Originated three years before current year 395   395   544
Originated four years before current year 285   285   1,420
Originated more than five years before current fiscal year 11,626   11,626   8,810
Revolving 1,325,274   1,325,274   1,022,233
Revolving to Term 37,111   37,111   31,212
Total loans 1,374,956   1,374,956   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 110 228 154 310  
Revolving 0 0 0 0  
Total 110 $ 228 188 $ 310  
Home equity | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,374,956   1,374,956   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 265   265   160
Originated three years before current year 271   271   140
Originated four years before current year 36   36   679
Originated more than five years before current fiscal year 5,637   5,637   4,483
Revolving 1,323,339   1,323,339   1,019,389
Revolving to Term 27,623   27,623   23,918
Total loans 1,357,171   1,357,171   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 0   0   328
Originated three years before current year 124   124   404
Originated four years before current year 249   249   741
Originated more than five years before current fiscal year 5,989   5,989   4,327
Revolving 1,935   1,935   2,844
Revolving to Term 9,488   9,488   7,294
Total loans 17,785   17,785   16,248
Pass | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 961,949   961,949   1,826,289
Originated one year before current year 1,737,949   1,737,949   1,573,669
Originated two years before current year 1,427,702   1,427,702   985,964
Originated three years before current year 846,164   846,164   520,883
Originated four years before current year 498,959   498,959   450,911
Originated more than five years before current fiscal year 723,629   723,629   495,979
Revolving 2,575,617   2,575,617   2,051,985
Revolving to Term 535,146   535,146   651,953
Total loans 9,307,115   9,307,115   8,557,633
Pass | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 1,104,612   1,104,612   2,177,841
Originated one year before current year 2,470,220   2,470,220   3,515,702
Originated two years before current year 4,029,061   4,029,061   2,563,638
Originated three years before current year 2,380,569   2,380,569   1,576,044
Originated four years before current year 1,428,952   1,428,952   1,010,351
Originated more than five years before current fiscal year 2,201,489   2,201,489   1,161,119
Revolving 157,382   157,382   103,332
Revolving to Term 813,468   813,468   960,386
Total loans 14,585,753   14,585,753   13,068,413
Pass | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 43,798   43,798   81,102
Originated one year before current year 85,992   85,992   64,583
Originated two years before current year 60,883   60,883   44,307
Originated three years before current year 38,834   38,834   38,086
Originated four years before current year 34,221   34,221   27,557
Originated more than five years before current fiscal year 36,947   36,947   19,028
Revolving 65,745   65,745   68,807
Revolving to Term 17,236   17,236   33,361
Total loans 383,656   383,656   376,831
Special Mention | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 29,482   29,482   20,038
Originated one year before current year 48,989   48,989   90,031
Originated two years before current year 63,401   63,401   19,953
Originated three years before current year 14,828   14,828   36,906
Originated four years before current year 31,286   31,286   25,756
Originated more than five years before current fiscal year 37,827   37,827   47,357
Revolving 123,628   123,628   89,765
Revolving to Term 26,188   26,188   44,348
Total loans 375,629   375,629   374,154
Special Mention | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 43,020   43,020   69,648
Originated one year before current year 37,176   37,176   69,946
Originated two years before current year 126,490   126,490   68,708
Originated three years before current year 121,150   121,150   27,059
Originated four years before current year 32,022   32,022   52,107
Originated more than five years before current fiscal year 85,827   85,827   95,896
Revolving 29,199   29,199   3,893
Revolving to Term 102,141   102,141   64,730
Total loans 577,025   577,025   451,987
Special Mention | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 332   332   0
Originated one year before current year 3,357   3,357   0
Originated two years before current year 2,675   2,675   857
Originated three years before current year 1,127   1,127   700
Originated four years before current year 733   733   1,001
Originated more than five years before current fiscal year 845   845   349
Revolving 2,473   2,473   2,144
Revolving to Term 3,459   3,459   12,728
Total loans 15,001   15,001   17,779
Substandard | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 33   33   27,271
Originated one year before current year 42,972   42,972   41,164
Originated two years before current year 61,074   61,074   27,990
Originated three years before current year 51,522   51,522   37,618
Originated four years before current year 44,581   44,581   10,461
Originated more than five years before current fiscal year 25,824   25,824   29,981
Revolving 77,158   77,158   72,703
Revolving to Term 37,828   37,828   56,716
Total loans 340,992   340,992   303,904
Substandard | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 13,274   13,274   26,638
Originated one year before current year 17,657   17,657   56,423
Originated two years before current year 128,097   128,097   21,401
Originated three years before current year 71,232   71,232   28,983
Originated four years before current year 52,180   52,180   61,186
Originated more than five years before current fiscal year 161,256   161,256   49,558
Revolving 0   0   0
Revolving to Term 53,886   53,886   48,760
Total loans 497,582   497,582   292,949
Substandard | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 110   110   436
Originated one year before current year 481   481   193
Originated two years before current year 295   295   252
Originated three years before current year 473   473   0
Originated four years before current year 35   35   0
Originated more than five years before current fiscal year 657   657   604
Revolving 315   315   15
Revolving to Term 146   146   1,006
Total loans 2,512   2,512   2,506
Nonaccrual | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   32
Originated one year before current year 746   746   7,034
Originated two years before current year 5,390   5,390   0
Originated three years before current year 2,211   2,211   0
Originated four years before current year 2,068   2,068   823
Originated more than five years before current fiscal year 3,724   3,724   3,411
Revolving 1,717   1,717   0
Revolving to Term 6,229   6,229   5,461
Total loans 22,085   22,085   16,761
Nonaccrual | Commercial real estate | 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 833   833   21,919
Originated two years before current year 3,685   3,685   10,706
Originated three years before current year 6,627   6,627   1,975
Originated four years before current year 4,353   4,353   1,634
Originated more than five years before current fiscal year 33,077   33,077   8,632
Revolving 0   0   0
Revolving to Term 1,063   1,063   1,400
Total loans 49,638   49,638   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 85   85   0
Originated two years before current year 726   726   482
Originated three years before current year 454   454   0
Originated four years before current year 108   108   4
Originated more than five years before current fiscal year 983   983   1,105
Revolving 0   0   0
Revolving to Term 825   825   1,402
Total loans 3,181   3,181   2,993
Doubtful | Commercial | 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 14,074   14,074   7,261
Originated two years before current year 12,549   12,549   5,925
Originated three years before current year 5,394   5,394   4,875
Originated four years before current year 621   621   1,742
Originated more than five years before current fiscal year 565   565   7,211
Revolving 13,679   13,679   0
Revolving to Term 9,524   9,524   0
Total loans 56,406   56,406   27,014
Doubtful | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   5,360
Originated one year before current year 5,365   5,365   429
Originated two years before current year 714   714   30,897
Originated three years before current year 35,473   35,473   2,306
Originated four years before current year 25,491   25,491   37,777
Originated more than five years before current fiscal year 42,037   42,037   35,187
Revolving 0   0   0
Revolving to Term 22,266   22,266   0
Total loans 131,346   131,346   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 437   437   727
Originated two years before current year 262   262   254
Originated three years before current year 194   194   286
Originated four years before current year 15   15   60
Originated more than five years before current fiscal year 222   222   84
Revolving 0   0   0
Revolving to Term 538   538   0
Total loans $ 1,668   $ 1,668   $ 1,713