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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, 2025
Mar. 31, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans $ 36,413,944   $ 36,285,887
2025 43 $ 0  
2024 1,251 486  
2023 5,209 4,605  
2022 5,667 2,997  
2021 8,644 154  
Prior 3,726 4,774  
Revolving 0 1,004  
Total 24,540 14,020  
Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 36,413,944   36,285,887
Commercial      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 10,650,615   10,288,560
Total 9,311 3,659  
Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 537,086   1,931,760
Originated one year before current year 1,885,299   1,440,650
Originated two years before current year 1,381,292   1,286,788
Originated three years before current year 1,210,738   777,990
Originated four years before current year 738,306   497,232
Originated more than five years before current fiscal year 929,502   673,411
Revolving 2,969,748   2,752,900
Revolving to Term 778,495   695,528
Total loans 10,430,466   10,056,259
2025 0 0  
2024 422 0  
2023 4,119 3,481  
2022 4,086 33  
2021 6 8  
Prior 678 4  
Revolving 0 133  
Total 9,311 3,659  
Commercial real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 16,135,327   16,307,486
Total 11,660 6,641  
Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 607,560   2,326,885
Originated one year before current year 2,197,706   2,652,462
Originated two years before current year 2,604,151   4,252,908
Originated three years before current year 4,018,984   2,269,851
Originated four years before current year 2,179,701   1,464,609
Originated more than five years before current fiscal year 3,151,843   1,911,188
Revolving 126,039   123,704
Revolving to Term 1,075,382   1,131,441
Total loans 15,961,366   16,133,048
2025 0 0  
2024 0 0  
2023 303 0  
2022 751 2,176  
2021 7,996 0  
Prior 2,610 4,465  
Revolving 0 0  
Total 11,660 6,641  
BBCC      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total 4 76  
BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 15,567   81,807
Originated one year before current year 78,521   80,974
Originated two years before current year 76,751   57,703
Originated three years before current year 54,043   35,437
Originated four years before current year 32,788   30,912
Originated more than five years before current fiscal year 45,857   24,293
Revolving 66,509   72,005
Revolving to Term 24,074   23,608
Total loans 394,110   406,739
2025 0 0  
2024 0 0  
2023 0 76  
2022 0 0  
2021 4 0  
Prior 0 0  
Revolving 0 0  
Total 4 76  
Residential real estate      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 92,558   510,184
Originated one year before current year 502,406   481,758
Originated two years before current year 472,943   1,466,295
Originated three years before current year 1,360,070   1,668,493
Originated four years before current year 1,720,253   1,580,169
Originated more than five years before current fiscal year 2,623,199   1,090,373
Revolving 0   43
Revolving to Term 265   271
Total loans 6,771,694   6,797,586
2025 0 0  
2024 0 0  
2023 0 0  
2022 0 0  
2021 0 0  
Prior 30 0  
Revolving 0 0  
Total 30 0  
Residential real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 6,771,694   6,797,586
Residential real estate | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 92,558   509,704
Originated one year before current year 501,441   476,698
Originated two years before current year 466,689   1,455,085
Originated three years before current year 1,345,556   1,662,195
Originated four years before current year 1,713,080   1,574,961
Originated more than five years before current fiscal year 2,582,469   1,058,175
Revolving 0   43
Revolving to Term 265   271
Total loans 6,702,058   6,737,132
Residential real estate | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   480
Originated one year before current year 965   5,060
Originated two years before current year 6,254   11,210
Originated three years before current year 14,514   6,298
Originated four years before current year 7,173   5,208
Originated more than five years before current fiscal year 40,730   32,198
Revolving 0   0
Revolving to Term 0   0
Total loans 69,636   60,454
Indirect      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 91,743   439,549
Originated one year before current year 407,033   281,057
Originated two years before current year 251,836   229,189
Originated three years before current year 200,948   93,601
Originated four years before current year 79,261   38,310
Originated more than five years before current fiscal year 39,715   15,072
Revolving 0   0
Revolving to Term 0   0
Total loans 1,070,536   1,096,778
2025 0 0  
2024 699 370  
2023 677 472  
2022 387 225  
2021 100 33  
Prior 71 38  
Revolving 0 0  
Total 1,934 1,138  
Indirect | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 1,070,536   1,096,778
Indirect | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 91,713   438,835
Originated one year before current year 406,102   279,910
Originated two years before current year 250,497   227,691
Originated three years before current year 199,570   92,223
Originated four years before current year 77,992   37,937
Originated more than five years before current fiscal year 39,215   14,810
Revolving 0   0
Revolving to Term 0   0
Total loans 1,065,089   1,091,406
Indirect | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 30   714
Originated one year before current year 931   1,147
Originated two years before current year 1,339   1,498
Originated three years before current year 1,378   1,378
Originated four years before current year 1,269   373
Originated more than five years before current fiscal year 500   262
Revolving 0   0
Revolving to Term 0   0
Total loans 5,447   5,372
Direct      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 15,131   83,869
Originated one year before current year 75,654   73,151
Originated two years before current year 63,061   66,928
Originated three years before current year 59,404   61,669
Originated four years before current year 54,240   34,627
Originated more than five years before current fiscal year 106,631   81,918
Revolving 132,659   108,573
Revolving to Term 4,675   3,409
Total loans 511,455   514,144
2025 43 0  
2024 130 116  
2023 110 576  
2022 443 529  
2021 538 113  
Prior 337 223  
Revolving 0 871  
Total 1,601 2,428  
Direct | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 511,455   514,144
Direct | Performing      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 15,131   83,773
Originated one year before current year 75,388   72,838
Originated two years before current year 62,401   66,563
Originated three years before current year 59,040   61,317
Originated four years before current year 53,930   34,159
Originated more than five years before current fiscal year 104,687   80,188
Revolving 132,659   108,572
Revolving to Term 4,594   3,327
Total loans 507,830   510,737
Direct | Nonperforming      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   96
Originated one year before current year 266   313
Originated two years before current year 660   365
Originated three years before current year 364   352
Originated four years before current year 310   468
Originated more than five years before current fiscal year 1,944   1,730
Revolving 0   1
Revolving to Term 81   82
Total loans 3,625   3,407
Home equity      
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   1,537
Originated three years before current year 1,478   301
Originated four years before current year 281   1,344
Originated more than five years before current fiscal year 12,530   15,925
Revolving 1,211,518   1,218,820
Revolving to Term 48,510   43,406
Total loans 1,274,317   1,281,333
2025 0 0  
2024 0 0  
2023 0 0  
2022 0 34  
2021 0 0  
Prior 0 44  
Revolving 0 0  
Total 0 $ 78  
Home equity | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Total loans 1,274,317   1,281,333
Home equity | Performing      
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   259
Originated three years before current year 233   210
Originated four years before current year 208   1,135
Originated more than five years before current fiscal year 7,994   11,005
Revolving 1,209,284   1,216,226
Revolving to Term 35,500   31,787
Total loans 1,253,219   1,260,622
Home equity | Nonperforming      
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   1,278
Originated three years before current year 1,245   91
Originated four years before current year 73   209
Originated more than five years before current fiscal year 4,536   4,920
Revolving 2,234   2,594
Revolving to Term 13,010   11,619
Total loans 21,098   20,711
Pass | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 526,158   1,852,046
Originated one year before current year 1,800,312   1,267,721
Originated two years before current year 1,206,395   1,145,488
Originated three years before current year 1,056,867   699,429
Originated four years before current year 662,292   450,332
Originated more than five years before current fiscal year 831,140   624,522
Revolving 2,769,402   2,577,941
Revolving to Term 633,871   593,232
Total loans 9,486,437   9,210,711
Pass | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 596,570   2,196,306
Originated one year before current year 2,116,861   2,555,236
Originated two years before current year 2,436,300   3,825,305
Originated three years before current year 3,391,971   2,065,037
Originated four years before current year 1,948,240   1,362,703
Originated more than five years before current fiscal year 2,817,618   1,641,611
Revolving 104,380   122,708
Revolving to Term 836,483   891,682
Total loans 14,248,423   14,660,588
Pass | BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 15,468   79,760
Originated one year before current year 76,655   78,420
Originated two years before current year 74,105   55,687
Originated three years before current year 52,259   33,857
Originated four years before current year 31,389   30,215
Originated more than five years before current fiscal year 43,774   22,797
Revolving 64,409   67,668
Revolving to Term 15,673   16,265
Total loans 373,732   384,669
Special Mention | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 240   46,935
Originated one year before current year 29,973   102,372
Originated two years before current year 76,049   32,250
Originated three years before current year 53,437   40,221
Originated four years before current year 14,567   21,538
Originated more than five years before current fiscal year 41,565   20,535
Revolving 65,298   80,625
Revolving to Term 30,738   28,978
Total loans 311,867   373,454
Special Mention | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 2,049   72,020
Originated one year before current year 44,474   31,203
Originated two years before current year 54,953   158,254
Originated three years before current year 145,170   48,524
Originated four years before current year 59,239   37,693
Originated more than five years before current fiscal year 76,730   64,357
Revolving 21,281   0
Revolving to Term 102,703   111,900
Total loans 506,599   523,951
Special Mention | BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   1,579
Originated one year before current year 1,424   1,067
Originated two years before current year 1,040   807
Originated three years before current year 618   917
Originated four years before current year 847   21
Originated more than five years before current fiscal year 390   224
Revolving 1,601   3,582
Revolving to Term 3,928   3,028
Total loans 9,848   11,225
Substandard | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 814   27,139
Originated one year before current year 46,978   49,340
Originated two years before current year 77,024   77,835
Originated three years before current year 69,548   35,036
Originated four years before current year 57,452   19,307
Originated more than five years before current fiscal year 43,957   25,503
Revolving 117,613   78,210
Revolving to Term 81,646   40,217
Total loans 495,032   352,587
Substandard | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 8,941   47,079
Originated one year before current year 21,634   55,923
Originated two years before current year 101,972   249,269
Originated three years before current year 453,906   102,913
Originated four years before current year 139,673   39,466
Originated more than five years before current fiscal year 167,046   142,110
Revolving 378   996
Revolving to Term 85,481   76,897
Total loans 979,031   714,653
Substandard | BBCC | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 99   468
Originated one year before current year 381   976
Originated two years before current year 1,111   56
Originated three years before current year 53   136
Originated four years before current year 60   598
Originated more than five years before current fiscal year 330   308
Revolving 499   755
Revolving to Term 3,035   2,876
Total loans 5,568   6,173
Nonaccrual | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 5   2,221
Originated one year before current year 612   1,072
Originated two years before current year 1,570   4,199
Originated three years before current year 5,037   1,530
Originated four years before current year 2,369   604
Originated more than five years before current fiscal year 3,673   1,357
Revolving 1,323   719
Revolving to Term 2,561   829
Total loans 17,150   12,531
Nonaccrual | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   3,693
Originated one year before current year 4,181   411
Originated two years before current year 880   3,579
Originated three years before current year 4,548   15,922
Originated four years before current year 5,295   1,930
Originated more than five years before current fiscal year 20,300   3,231
Revolving 0   0
Revolving to Term 24,600   118
Total loans 59,804   28,884
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   114
Originated two years before current year 110   312
Originated three years before current year 716   177
Originated four years before current year 304   63
Originated more than five years before current fiscal year 673   119
Revolving 0   0
Revolving to Term 610   551
Total loans 2,413   1,336
Doubtful | Commercial | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 9,869   3,419
Originated one year before current year 7,424   20,145
Originated two years before current year 20,254   27,016
Originated three years before current year 25,849   1,774
Originated four years before current year 1,626   5,451
Originated more than five years before current fiscal year 9,167   1,494
Revolving 16,112   15,405
Revolving to Term 29,679   32,272
Total loans 119,980   106,976
Doubtful | Commercial real estate | Portfolio Segment After Reclassifications      
Financing Receivable, Credit Quality Indicator [Line Items]      
Originated in current fiscal year 0   7,787
Originated one year before current year 10,556   9,689
Originated two years before current year 10,046   16,501
Originated three years before current year 23,389   37,455
Originated four years before current year 27,254   22,817
Originated more than five years before current fiscal year 70,149   59,879
Revolving 0   0
Revolving to Term 26,115   50,844
Total loans 167,509   204,972
Doubtful | 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 61   397
Originated two years before current year 385   841
Originated three years before current year 397   350
Originated four years before current year 188   15
Originated more than five years before current fiscal year 690   845
Revolving 0   0
Revolving to Term 828   888
Total loans $ 2,549   $ 3,336