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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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans $ 47,967,915   $ 47,967,915   $ 36,285,887
2025 910 $ 1,441 1,136 $ 1,570  
2024 6,703 9,546 15,249 13,605  
2023 3,889 1,616 10,566 13,317  
2022 8,819 947 23,310 5,279  
2021 5,275 1,105 19,008 1,593  
Prior 9,117 3,167 19,912 11,449  
Revolving 689 1,143 715 3,213  
Total 35,402 18,965 89,896 50,026  
Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 47,967,915   47,967,915   36,285,887
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 14,506,375   14,506,375   10,288,560
Total 22,068 11,512 48,185 25,098  
Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 1,999,310   1,999,310   1,931,760
Originated one year before current year 2,272,787   2,272,787   1,440,650
Originated two years before current year 1,581,582   1,581,582   1,286,788
Originated three years before current year 1,319,590   1,319,590   777,990
Originated four years before current year 909,861   909,861   497,232
Originated more than five years before current fiscal year 2,272,496   2,272,496   673,411
Revolving 3,086,750   3,086,750   2,752,900
Revolving to Term 844,411   844,411   695,528
Total loans 14,286,787   14,286,787   10,056,259
2025 684 1,234 684 1,234  
2024 6,106 8,031 12,987 10,389  
2023 2,235 633 7,030 10,263  
2022 7,155 297 18,212 719  
2021 2,229 840 2,818 891  
Prior 3,659 55 6,454 625  
Revolving 0 422 0 977  
Total 22,068 11,512 48,185 25,098  
Commercial real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 22,083,734   22,083,734   16,307,486
Total 8,016 2,799 29,114 12,541  
Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 2,486,595   2,486,595   2,326,885
Originated one year before current year 2,442,810   2,442,810   2,652,462
Originated two years before current year 3,004,731   3,004,731   4,252,908
Originated three years before current year 4,254,775   4,254,775   2,269,851
Originated four years before current year 2,470,909   2,470,909   1,464,609
Originated more than five years before current fiscal year 5,997,802   5,997,802   1,911,188
Revolving 191,531   191,531   123,704
Revolving to Term 1,061,649   1,061,649   1,131,441
Total loans 21,910,802   21,910,802   16,133,048
2025 0 0 0 0  
2024 0 140 0 140  
2023 603 61 906 84  
2022 1,024 44 2,980 2,688  
2021 2,787 0 14,783 0  
Prior 3,602 2,554 10,445 9,629  
Revolving 0 0 0 0  
Total 8,016 2,799 29,114 12,541  
BBCC          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total 419 676 476 1,687  
BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 42,788   42,788   81,807
Originated one year before current year 56,510   56,510   80,974
Originated two years before current year 56,661   56,661   57,703
Originated three years before current year 38,931   38,931   35,437
Originated four years before current year 22,904   22,904   30,912
Originated more than five years before current fiscal year 83,290   83,290   24,293
Revolving 65,830   65,830   72,005
Revolving to Term 25,606   25,606   23,608
Total loans 392,520   392,520   406,739
2025 0 0 0 0  
2024 0 481 0 1,086  
2023 303 164 316 393  
2022 94 21 125 56  
2021 10 0 23 112  
Prior 12 10 12 40  
Revolving 0 0 0 0  
Total 419 676 476 1,687  
Residential real estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 497,009   497,009   510,184
Originated one year before current year 582,643   582,643   481,758
Originated two years before current year 615,235   615,235   1,466,295
Originated three years before current year 1,641,245   1,641,245   1,668,493
Originated four years before current year 2,040,124   2,040,124   1,580,169
Originated more than five years before current fiscal year 2,813,619   2,813,619   1,090,373
Revolving 0   0   43
Revolving to Term 252   252   271
Total loans 8,190,127   8,190,127   6,797,586
2025 0 0 0 0  
2024 0 0 0 0  
2023 0 0 0 0  
2022 0 0 0 0  
2021 0 0 0 0  
Prior 25 0 302 0  
Revolving 0 0 0 0  
Total 25 0 302 0  
Residential real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 8,190,127   8,190,127   6,797,586
Residential real estate | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 496,387   496,387   509,704
Originated one year before current year 579,883   579,883   476,698
Originated two years before current year 607,232   607,232   1,455,085
Originated three years before current year 1,624,263   1,624,263   1,662,195
Originated four years before current year 2,035,084   2,035,084   1,574,961
Originated more than five years before current fiscal year 2,783,580   2,783,580   1,058,175
Revolving 0   0   43
Revolving to Term 252   252   271
Total loans 8,126,681   8,126,681   6,737,132
Residential real estate | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 622   622   480
Originated one year before current year 2,760   2,760   5,060
Originated two years before current year 8,003   8,003   11,210
Originated three years before current year 16,982   16,982   6,298
Originated four years before current year 5,040   5,040   5,208
Originated more than five years before current fiscal year 30,039   30,039   32,198
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 63,446   63,446   60,454
Indirect          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 306,650   306,650   439,549
Originated one year before current year 333,615   333,615   281,057
Originated two years before current year 196,295   196,295   229,189
Originated three years before current year 147,685   147,685   93,601
Originated four years before current year 53,537   53,537   38,310
Originated more than five years before current fiscal year 20,791   20,791   15,072
Revolving 161   161   0
Revolving to Term 0   0   0
Total loans 1,058,734   1,058,734   1,096,778
2025 213 199 225 253  
2024 504 797 1,834 1,698  
2023 634 360 1,867 1,209  
2022 291 110 995 431  
2021 146 41 439 80  
Prior 75 208 202 266  
Revolving 0 0 0 0  
Total 1,863 1,715 5,562 3,937  
Indirect | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,058,734   1,058,734   1,096,778
Indirect | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 306,534   306,534   438,835
Originated one year before current year 332,395   332,395   279,910
Originated two years before current year 194,890   194,890   227,691
Originated three years before current year 146,486   146,486   92,223
Originated four years before current year 52,820   52,820   37,937
Originated more than five years before current fiscal year 20,525   20,525   14,810
Revolving 161   161   0
Revolving to Term 0   0   0
Total loans 1,053,811   1,053,811   1,091,406
Indirect | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 116   116   714
Originated one year before current year 1,220   1,220   1,147
Originated two years before current year 1,405   1,405   1,498
Originated three years before current year 1,199   1,199   1,378
Originated four years before current year 717   717   373
Originated more than five years before current fiscal year 266   266   262
Revolving 0   0   0
Revolving to Term 0   0   0
Total loans 4,923   4,923   5,372
Direct          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 68,688   68,688   83,869
Originated one year before current year 73,326   73,326   73,151
Originated two years before current year 61,277   61,277   66,928
Originated three years before current year 62,603   62,603   61,669
Originated four years before current year 50,303   50,303   34,627
Originated more than five years before current fiscal year 93,976   93,976   81,918
Revolving 171,686   171,686   108,573
Revolving to Term 7,274   7,274   3,409
Total loans 589,133   589,133   514,144
2025 13 8 227 83  
2024 93 97 428 292  
2023 114 398 447 1,368  
2022 154 475 897 1,351  
2021 103 224 945 510  
Prior 1,741 214 2,329 609  
Revolving 689 721 715 2,236  
Total 2,907 2,137 5,988 6,449  
Direct | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 589,133   589,133   514,144
Direct | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 68,671   68,671   83,773
Originated one year before current year 73,076   73,076   72,838
Originated two years before current year 60,987   60,987   66,563
Originated three years before current year 62,339   62,339   61,317
Originated four years before current year 49,941   49,941   34,159
Originated more than five years before current fiscal year 90,699   90,699   80,188
Revolving 171,685   171,685   108,572
Revolving to Term 7,262   7,262   3,327
Total loans 584,660   584,660   510,737
Direct | Nonperforming          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 17   17   96
Originated one year before current year 250   250   313
Originated two years before current year 290   290   365
Originated three years before current year 264   264   352
Originated four years before current year 362   362   468
Originated more than five years before current fiscal year 3,277   3,277   1,730
Revolving 1   1   1
Revolving to Term 12   12   82
Total loans 4,473   4,473   3,407
Home equity          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 22,914   22,914   0
Originated one year before current year 29,855   29,855   0
Originated two years before current year 23,233   23,233   1,537
Originated three years before current year 26,257   26,257   301
Originated four years before current year 19,778   19,778   1,344
Originated more than five years before current fiscal year 54,987   54,987   15,925
Revolving 1,299,816   1,299,816   1,218,820
Revolving to Term 62,972   62,972   43,406
Total loans 1,539,812   1,539,812   1,281,333
2025 0 0 0 0  
2024 0 0 0 0  
2023 0 0 0 0  
2022 101 0 101 34  
2021 0 0 0 0  
Prior 3 126 168 280  
Revolving 0 0 0 0  
Total 104 $ 126 269 $ 314  
Home equity | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Total loans 1,539,812   1,539,812   1,281,333
Home equity | Performing          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 22,914   22,914   0
Originated one year before current year 29,855   29,855   0
Originated two years before current year 23,233   23,233   259
Originated three years before current year 25,485   25,485   210
Originated four years before current year 19,736   19,736   1,135
Originated more than five years before current fiscal year 52,061   52,061   11,005
Revolving 1,298,408   1,298,408   1,216,226
Revolving to Term 49,959   49,959   31,787
Total loans 1,521,651   1,521,651   1,260,622
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   0
Originated two years before current year 0   0   1,278
Originated three years before current year 772   772   91
Originated four years before current year 42   42   209
Originated more than five years before current fiscal year 2,926   2,926   4,920
Revolving 1,408   1,408   2,594
Revolving to Term 13,013   13,013   11,619
Total loans 18,161   18,161   20,711
Pass | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 1,963,538   1,963,538   1,852,046
Originated one year before current year 2,114,040   2,114,040   1,267,721
Originated two years before current year 1,304,549   1,304,549   1,145,488
Originated three years before current year 1,175,774   1,175,774   699,429
Originated four years before current year 801,522   801,522   450,332
Originated more than five years before current fiscal year 2,040,836   2,040,836   624,522
Revolving 2,904,090   2,904,090   2,577,941
Revolving to Term 723,505   723,505   593,232
Total loans 13,027,854   13,027,854   9,210,711
Pass | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 2,471,748   2,471,748   2,196,306
Originated one year before current year 2,398,463   2,398,463   2,555,236
Originated two years before current year 2,789,857   2,789,857   3,825,305
Originated three years before current year 3,763,365   3,763,365   2,065,037
Originated four years before current year 2,087,653   2,087,653   1,362,703
Originated more than five years before current fiscal year 5,368,342   5,368,342   1,641,611
Revolving 143,852   143,852   122,708
Revolving to Term 888,846   888,846   891,682
Total loans 19,912,126   19,912,126   14,660,588
Pass | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 42,648   42,648   79,760
Originated one year before current year 55,346   55,346   78,420
Originated two years before current year 54,848   54,848   55,687
Originated three years before current year 37,661   37,661   33,857
Originated four years before current year 22,209   22,209   30,215
Originated more than five years before current fiscal year 80,716   80,716   22,797
Revolving 63,839   63,839   67,668
Revolving to Term 18,642   18,642   16,265
Total loans 375,909   375,909   384,669
Special Mention | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 18,546   18,546   46,935
Originated one year before current year 52,736   52,736   102,372
Originated two years before current year 91,278   91,278   32,250
Originated three years before current year 29,264   29,264   40,221
Originated four years before current year 4,598   4,598   21,538
Originated more than five years before current fiscal year 83,563   83,563   20,535
Revolving 56,994   56,994   80,625
Revolving to Term 9,964   9,964   28,978
Total loans 346,943   346,943   373,454
Special Mention | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 4,098   4,098   72,020
Originated one year before current year 19,355   19,355   31,203
Originated two years before current year 63,971   63,971   158,254
Originated three years before current year 141,199   141,199   48,524
Originated four years before current year 124,938   124,938   37,693
Originated more than five years before current fiscal year 141,045   141,045   64,357
Revolving 16,314   16,314   0
Revolving to Term 27,468   27,468   111,900
Total loans 538,388   538,388   523,951
Special Mention | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 50   50   1,579
Originated one year before current year 767   767   1,067
Originated two years before current year 559   559   807
Originated three years before current year 575   575   917
Originated four years before current year 268   268   21
Originated more than five years before current fiscal year 1,319   1,319   224
Revolving 1,924   1,924   3,582
Revolving to Term 2,316   2,316   3,028
Total loans 7,778   7,778   11,225
Substandard | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 17,189   17,189   27,139
Originated one year before current year 95,173   95,173   49,340
Originated two years before current year 148,897   148,897   77,835
Originated three years before current year 70,993   70,993   35,036
Originated four years before current year 99,347   99,347   19,307
Originated more than five years before current fiscal year 131,139   131,139   25,503
Revolving 115,613   115,613   78,210
Revolving to Term 56,399   56,399   40,217
Total loans 734,750   734,750   352,587
Substandard | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 10,749   10,749   47,079
Originated one year before current year 17,920   17,920   55,923
Originated two years before current year 126,618   126,618   249,269
Originated three years before current year 296,904   296,904   102,913
Originated four years before current year 204,007   204,007   39,466
Originated more than five years before current fiscal year 363,437   363,437   142,110
Revolving 31,365   31,365   996
Revolving to Term 90,219   90,219   76,897
Total loans 1,141,219   1,141,219   714,653
Substandard | BBCC | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 90   90   468
Originated one year before current year 397   397   976
Originated two years before current year 980   980   56
Originated three years before current year 486   486   136
Originated four years before current year 44   44   598
Originated more than five years before current fiscal year 464   464   308
Revolving 37   37   755
Revolving to Term 2,827   2,827   2,876
Total loans 5,325   5,325   6,173
Nonaccrual | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 37   37   2,221
Originated one year before current year 2,113   2,113   1,072
Originated two years before current year 14,644   14,644   4,199
Originated three years before current year 15,754   15,754   1,530
Originated four years before current year 2,576   2,576   604
Originated more than five years before current fiscal year 9,151   9,151   1,357
Revolving 3,039   3,039   719
Revolving to Term 1,696   1,696   829
Total loans 49,010   49,010   12,531
Nonaccrual | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   3,693
Originated one year before current year 7,072   7,072   411
Originated two years before current year 5,087   5,087   3,579
Originated three years before current year 40,963   40,963   15,922
Originated four years before current year 26,067   26,067   1,930
Originated more than five years before current fiscal year 38,297   38,297   3,231
Revolving 0   0   0
Revolving to Term 27,618   27,618   118
Total loans 145,104   145,104   28,884
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 0   0   114
Originated two years before current year 14   14   312
Originated three years before current year 50   50   177
Originated four years before current year 15   15   63
Originated more than five years before current fiscal year 321   321   119
Revolving 30   30   0
Revolving to Term 407   407   551
Total loans 837   837   1,336
Doubtful | Commercial | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   3,419
Originated one year before current year 8,725   8,725   20,145
Originated two years before current year 22,214   22,214   27,016
Originated three years before current year 27,805   27,805   1,774
Originated four years before current year 1,818   1,818   5,451
Originated more than five years before current fiscal year 7,807   7,807   1,494
Revolving 7,014   7,014   15,405
Revolving to Term 52,847   52,847   32,272
Total loans 128,230   128,230   106,976
Doubtful | Commercial real estate | Portfolio Segment After Reclassifications          
Financing Receivable, Credit Quality Indicator [Line Items]          
Originated in current fiscal year 0   0   7,787
Originated one year before current year 0   0   9,689
Originated two years before current year 19,198   19,198   16,501
Originated three years before current year 12,344   12,344   37,455
Originated four years before current year 28,244   28,244   22,817
Originated more than five years before current fiscal year 86,681   86,681   59,879
Revolving 0   0   0
Revolving to Term 27,498   27,498   50,844
Total loans 173,965   173,965   204,972
Doubtful | 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 0   0   397
Originated two years before current year 260   260   841
Originated three years before current year 159   159   350
Originated four years before current year 368   368   15
Originated more than five years before current fiscal year 470   470   845
Revolving 0   0   0
Revolving to Term 1,414   1,414   888
Total loans $ 2,671   $ 2,671   $ 3,336