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Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | $ 13,584,828 | $ 13,786,479
Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 13,584,828 | 13,786,479
Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 3,505,183 | 3,956,422
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 917,422 | 1,709,047
Originated one year before current year | 667,949 | 440,462
Originated two years before current year | 333,239 | 202,025
Originated three years before current year | 140,186 | 256,753
Originated four years before current year | 184,266 | 130,543
Originated more than five years before current fiscal year | 257,501 | 281,337
Revolving | 623,826 | 576,278
Revolving to Term | 188,404 | 161,255
Total loans | 3,312,793 | 3,757,700
Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 6,290,632 | 5,946,512
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 1,091,880 | 1,556,959
Originated one year before current year | 1,579,590 | 1,099,162
Originated two years before current year | 965,700 | 794,524
Originated three years before current year | 624,542 | 779,186
Originated four years before current year | 622,631 | 539,960
Originated more than five years before current fiscal year | 770,832 | 571,651
Revolving | 25,555 | 28,122
Revolving to Term | 451,605 | 405,247
Total loans | 6,132,335 | 5,774,811
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 61,081 | 96,821
Originated one year before current year | 78,642 | 77,287
Originated two years before current year | 60,393 | 51,672
Originated three years before current year | 40,101 | 37,218
Originated four years before current year | 28,522 | 25,622
Originated more than five years before current fiscal year | 13,220 | 5,357
Revolving | 46,720 | 53,667
Revolving to Term | 22,008 | 22,779
Total loans | 350,687 | 370,423
Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 476,235 | 624,500
Originated one year before current year | 659,727 | 453,383
Originated two years before current year | 304,883 | 132,787
Originated three years before current year | 82,268 | 191,268
Originated four years before current year | 120,626 | 204,588
Originated more than five years before current fiscal year | 580,933 | 641,774
Revolving | 0 | 0
Revolving to Term | 110 | 122
Total loans | 2,224,782 | 2,248,422
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,224,782 | 2,248,422
Residential real estate | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 476,235 | 624,435
Originated one year before current year | 659,413 | 453,132
Originated two years before current year | 304,715 | 132,107
Originated three years before current year | 81,974 | 190,376
Originated four years before current year | 119,596 | 202,457
Originated more than five years before current fiscal year | 563,796 | 620,999
Revolving | 0 | 0
Revolving to Term | 110 | 122
Total loans | 2,205,839 | 2,223,628
Residential real estate | Nonperforming |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 0 | 65
Originated one year before current year | 314 | 251
Originated two years before current year | 168 | 680
Originated three years before current year | 294 | 892
Originated four years before current year | 1,030 | 2,131
Originated more than five years before current fiscal year | 17,137 | 20,775
Revolving | 0 | 0
Revolving to Term | 0 | 0
Total loans | 18,943 | 24,794
Indirect |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 266,010 | 353,011
Originated one year before current year | 261,119 | 253,957
Originated two years before current year | 169,561 | 135,670
Originated three years before current year | 82,293 | 97,253
Originated four years before current year | 52,517 | 52,654
Originated more than five years before current fiscal year | 29,263 | 21,280
Revolving | 0 | 0
Revolving to Term | 22 | 77
Total loans | 860,785 | 913,902
Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 860,785 | 913,902
Indirect | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 265,815 | 352,989
Originated one year before current year | 260,763 | 253,514
Originated two years before current year | 169,061 | 134,893
Originated three years before current year | 81,733 | 96,587
Originated four years before current year | 52,028 | 52,225
Originated more than five years before current fiscal year | 28,918 | 21,088
Revolving | 0 | 0
Revolving to Term | 22 | 77
Total loans | 858,340 | 911,373
Indirect | Nonperforming |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 195 | 22
Originated one year before current year | 356 | 443
Originated two years before current year | 500 | 777
Originated three years before current year | 560 | 666
Originated four years before current year | 489 | 429
Originated more than five years before current fiscal year | 345 | 192
Revolving | 0 | 0
Revolving to Term | 0 | 0
Total loans | 2,445 | 2,529
Direct |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 28,568 | 32,521
Originated one year before current year | 19,086 | 29,330
Originated two years before current year | 17,113 | 30,681
Originated three years before current year | 17,840 | 16,246
Originated four years before current year | 9,063 | 8,774
Originated more than five years before current fiscal year | 18,695 | 19,991
Revolving | 38,214 | 26,032
Revolving to Term | 545 | 1,232
Total loans | 149,124 | 164,807
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 149,124 | 164,807
Direct | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 28,564 | 32,499
Originated one year before current year | 19,025 | 29,189
Originated two years before current year | 16,984 | 30,510
Originated three years before current year | 17,674 | 16,182
Originated four years before current year | 8,926 | 8,527
Originated more than five years before current fiscal year | 18,004 | 19,465
Revolving | 38,211 | 26,028
Revolving to Term | 541 | 1,229
Total loans | 147,929 | 163,629
Direct | Nonperforming |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 4 | 22
Originated one year before current year | 61 | 141
Originated two years before current year | 129 | 171
Originated three years before current year | 166 | 64
Originated four years before current year | 137 | 247
Originated more than five years before current fiscal year | 691 | 526
Revolving | 3 | 4
Revolving to Term | 4 | 3
Total loans | 1,195 | 1,178
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 0 | 1
Originated one year before current year | 0 | 1,034
Originated two years before current year | 628 | 444
Originated three years before current year | 449 | 891
Originated four years before current year | 664 | 249
Originated more than five years before current fiscal year | 498 | 116
Revolving | 530,160 | 529,369
Revolving to Term | 21,923 | 24,310
Total loans | 554,322 | 556,414
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 554,322 | 556,414
Home equity | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 0 | 1
Originated one year before current year | 0 | 997
Originated two years before current year | 628 | 444
Originated three years before current year | 390 | 891
Originated four years before current year | 568 | 238
Originated more than five years before current fiscal year | 436 | 0
Revolving | 529,967 | 529,275
Revolving to Term | 18,695 | 20,314
Total loans | 550,684 | 552,160
Home equity | Nonperforming |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 0 | 0
Originated one year before current year | 0 | 37
Originated two years before current year | 0 | 0
Originated three years before current year | 59 | 0
Originated four years before current year | 96 | 11
Originated more than five years before current fiscal year | 62 | 116
Revolving | 193 | 94
Revolving to Term | 3,228 | 3,996
Total loans | 3,638 | 4,254
Pass | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 897,040 | 1,675,964
Originated one year before current year | 638,945 | 420,736
Originated two years before current year | 317,026 | 171,228
Originated three years before current year | 125,230 | 227,710
Originated four years before current year | 165,228 | 124,041
Originated more than five years before current fiscal year | 245,618 | 262,538
Revolving | 608,212 | 549,849
Revolving to Term | 164,020 | 148,508
Total loans | 3,161,319 | 3,580,574
Pass | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 1,058,090 | 1,537,226
Originated one year before current year | 1,561,584 | 1,041,305
Originated two years before current year | 902,806 | 749,102
Originated three years before current year | 580,718 | 677,119
Originated four years before current year | 558,072 | 496,086
Originated more than five years before current fiscal year | 711,425 | 513,658
Revolving | 22,791 | 28,122
Revolving to Term | 430,064 | 382,219
Total loans | 5,825,550 | 5,424,837
Pass | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 59,605 | 94,828
Originated one year before current year | 77,065 | 73,913
Originated two years before current year | 57,928 | 49,875
Originated three years before current year | 38,168 | 36,288
Originated four years before current year | 27,380 | 24,946
Originated more than five years before current fiscal year | 12,867 | 5,327
Revolving | 44,982 | 52,393
Revolving to Term | 18,622 | 19,353
Total loans | 336,617 | 356,923
Criticized | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 11,262 | 23,982
Originated one year before current year | 8,747 | 9,603
Originated two years before current year | 2,473 | 15,003
Originated three years before current year | 0 | 9,508
Originated four years before current year | 7,964 | 3,383
Originated more than five years before current fiscal year | 2,901 | 5,369
Revolving | 7,784 | 10,307
Revolving to Term | 11,533 | 2,685
Total loans | 52,664 | 79,840
Criticized | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 28,606 | 6,874
Originated one year before current year | 5,243 | 49,271
Originated two years before current year | 53,705 | 26,464
Originated three years before current year | 34,005 | 46,994
Originated four years before current year | 18,706 | 17,648
Originated more than five years before current fiscal year | 23,259 | 33,490
Revolving | 152 | 0
Revolving to Term | 17,012 | 19,804
Total loans | 180,688 | 200,545
Criticized | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 1,189 | 1,599
Originated one year before current year | 1,381 | 1,403
Originated two years before current year | 1,063 | 621
Originated three years before current year | 306 | 414
Originated four years before current year | 0 | 643
Originated more than five years before current fiscal year | 0 | 0
Revolving | 1,449 | 868
Revolving to Term | 1,475 | 1,259
Total loans | 6,863 | 6,807
Substandard | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 8,024 | 6,501
Originated one year before current year | 16,399 | 6,369
Originated two years before current year | 12,056 | 10,077
Originated three years before current year | 11,253 | 9,836
Originated four years before current year | 6,874 | 2,774
Originated more than five years before current fiscal year | 5,171 | 8,441
Revolving | 7,642 | 15,344
Revolving to Term | 4,857 | 3,049
Total loans | 72,276 | 62,391
Substandard | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 4,878 | 11,451
Originated one year before current year | 10,254 | 4,700
Originated two years before current year | 7,168 | 13,565
Originated three years before current year | 7,201 | 26,691
Originated four years before current year | 21,423 | 5,308
Originated more than five years before current fiscal year | 13,290 | 8,665
Revolving | 2,291 | 0
Revolving to Term | 4,382 | 2,911
Total loans | 70,887 | 73,291
Substandard | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 287 | 233
Originated one year before current year | 61 | 1,417
Originated two years before current year | 1,113 | 195
Originated three years before current year | 209 | 246
Originated four years before current year | 912 | 33
Originated more than five years before current fiscal year | 139 | 0
Revolving | 289 | 317
Revolving to Term | 576 | 701
Total loans | 3,586 | 3,142
Nonaccrual | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 1,096 | 2,600
Originated one year before current year | 3,710 | 3,754
Originated two years before current year | 1,031 | 4,701
Originated three years before current year | 2,407 | 6,951
Originated four years before current year | 4,019 | 49
Originated more than five years before current fiscal year | 0 | 4,379
Revolving | 188 | 778
Revolving to Term | 7,994 | 7,013
Total loans | 20,445 | 30,225
Nonaccrual | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 306 | 1,408
Originated one year before current year | 2,509 | 2,054
Originated two years before current year | 0 | 5,393
Originated three years before current year | 1,472 | 9,456
Originated four years before current year | 6,229 | 1,635
Originated more than five years before current fiscal year | 10,089 | 12,564
Revolving | 321 | 0
Revolving to Term | 147 | 313
Total loans | 21,073 | 32,823
Nonaccrual | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 0 | 161
Originated one year before current year | 135 | 551
Originated two years before current year | 0 | 134
Originated three years before current year | 0 | 200
Originated four years before current year | 230 | 0
Originated more than five years before current fiscal year | 0 | 0
Revolving | 0 | 89
Revolving to Term | 1,335 | 1,466
Total loans | 1,700 | 2,601
Doubtful | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 0 | 0
Originated one year before current year | 148 | 0
Originated two years before current year | 653 | 1,016
Originated three years before current year | 1,296 | 2,748
Originated four years before current year | 181 | 296
Originated more than five years before current fiscal year | 3,811 | 610
Revolving | 0 | 0
Revolving to Term | 0 | 0
Total loans | 6,089 | 4,670
Doubtful | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 0 | 0
Originated one year before current year | 0 | 1,832
Originated two years before current year | 2,021 | 0
Originated three years before current year | 1,146 | 18,926
Originated four years before current year | 18,201 | 19,283
Originated more than five years before current fiscal year | 12,769 | 3,274
Revolving | 0 | 0
Revolving to Term | 0 | 0
Total loans | 34,137 | 43,315
Doubtful | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated in current fiscal year | 0 | 0
Originated one year before current year | 0 | 3
Originated two years before current year | 289 | 847
Originated three years before current year | 1,418 | 70
Originated four years before current year | 0 | 0
Originated more than five years before current fiscal year | 214 | 30
Revolving | 0 | 0
Revolving to Term | 0 | 0
Total loans | $ 1,921 | $ 950

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