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Loans and Allowance for Credit Losses - Schedule of Risk Rating and Payment Performance (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | $ 13,925,261 | $ 13,786,479
Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 13,925,261 | 13,786,479
Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 96,482 | 101,194
Auto |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 3,300 | 3,292
Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 13,658 | 14,607
Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 4,068,896 | 3,956,422
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 372,685 | 281,337
Originated four years before current year | 242,788 | 130,543
Originated three years before current year | 170,134 | 256,753
Originated two years before current year | 393,203 | 202,025
Originated one year before current year | 1,231,765 | 440,462
Originated in current fiscal year | 769,172 | 1,709,047
Revolving Loans | 512,317 | 576,278
Revolving to Term Loans | 188,865 | 161,255
Total loans | 3,880,929 | 3,757,700
Commercial | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 7,470 | 8,976
Commercial | Auto |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 165 | 394
Commercial | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 446 | 893
Commercial real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 6,074,135 | 5,946,512
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 974,650 | 571,651
Originated four years before current year | 751,816 | 539,960
Originated three years before current year | 768,904 | 779,186
Originated two years before current year | 1,056,403 | 794,524
Originated one year before current year | 1,593,234 | 1,099,162
Originated in current fiscal year | 335,245 | 1,556,959
Revolving Loans | 28,995 | 28,122
Revolving to Term Loans | 396,605 | 405,247
Total loans | 5,905,852 | 5,774,811
Commercial real estate | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 60,773 | 60,844
Commercial real estate | Auto |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Commercial real estate | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 13,189 | 13,685
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 24,712 | 5,357
Originated four years before current year | 35,117 | 25,622
Originated three years before current year | 47,787 | 37,218
Originated two years before current year | 71,033 | 51,672
Originated one year before current year | 90,857 | 77,287
Originated in current fiscal year | 20,540 | 96,821
Revolving Loans | 43,371 | 53,667
Revolving to Term Loans | 22,833 | 22,779
Total loans | 356,250 | 370,423
BBCC | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,267 | 1,425
BBCC | Auto |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 122 | 134
BBCC | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 728,807 | 641,774
Originated four years before current year | 156,079 | 204,588
Originated three years before current year | 108,826 | 191,268
Originated two years before current year | 381,074 | 132,787
Originated one year before current year | 670,021 | 453,383
Originated in current fiscal year | 158,352 | 624,500
Revolving Loans | 0 | 0
Revolving to Term Loans | 118 | 122
Total loans | 2,203,277 | 2,248,422
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,203,277 | 2,248,422
Residential real estate | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 20,935 | 24,794
Residential real estate | Auto |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Residential real estate | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Residential real estate | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 709,771 | 620,999
Originated four years before current year | 155,099 | 202,457
Originated three years before current year | 108,229 | 190,376
Originated two years before current year | 380,852 | 132,107
Originated one year before current year | 669,921 | 453,132
Originated in current fiscal year | 158,352 | 624,435
Revolving Loans | 0 | 0
Revolving to Term Loans | 118 | 122
Total loans | 2,182,342 | 2,223,628
Residential real estate | Nonperforming |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 19,036 | 20,775
Originated four years before current year | 980 | 2,131
Originated three years before current year | 597 | 892
Originated two years before current year | 222 | 680
Originated one year before current year | 100 | 251
Originated in current fiscal year | 0 | 65
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total loans | 20,935 | 24,794
Indirect |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 54,903 | 21,280
Originated four years before current year | 80,403 | 52,654
Originated three years before current year | 116,136 | 97,253
Originated two years before current year | 224,584 | 135,670
Originated one year before current year | 329,531 | 253,957
Originated in current fiscal year | 81,709 | 353,011
Revolving Loans | 0 | 0
Revolving to Term Loans | 67 | 77
Total loans | 887,333 | 913,902
Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 887,333 | 913,902
Indirect | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Indirect | Auto |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 2,786 | 2,529
Indirect | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Indirect | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 54,370 | 21,088
Originated four years before current year | 79,764 | 52,225
Originated three years before current year | 115,341 | 96,587
Originated two years before current year | 224,114 | 134,893
Originated one year before current year | 329,182 | 253,514
Originated in current fiscal year | 81,709 | 352,989
Revolving Loans | 0 | 0
Revolving to Term Loans | 67 | 77
Total loans | 884,547 | 911,373
Indirect | Nonperforming |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 533 | 192
Originated four years before current year | 639 | 429
Originated three years before current year | 795 | 666
Originated two years before current year | 470 | 777
Originated one year before current year | 349 | 443
Originated in current fiscal year | 0 | 22
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total loans | 2,786 | 2,529
Direct |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 24,469 | 19,991
Originated four years before current year | 13,346 | 8,774
Originated three years before current year | 25,917 | 16,246
Originated two years before current year | 25,540 | 30,681
Originated one year before current year | 27,661 | 29,330
Originated in current fiscal year | 7,511 | 32,521
Revolving Loans | 25,019 | 26,032
Revolving to Term Loans | 1,008 | 1,232
Total loans | 150,471 | 164,807
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 150,471 | 164,807
Direct | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 980 | 901
Direct | Auto |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 227 | 235
Direct | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 23 | 29
Direct | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 23,706 | 19,465
Originated four years before current year | 13,194 | 8,527
Originated three years before current year | 25,754 | 16,182
Originated two years before current year | 25,427 | 30,510
Originated one year before current year | 27,595 | 29,189
Originated in current fiscal year | 7,511 | 32,499
Revolving Loans | 25,014 | 26,028
Revolving to Term Loans | 1,006 | 1,229
Total loans | 149,207 | 163,629
Direct | Nonperforming |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 763 | 526
Originated four years before current year | 152 | 247
Originated three years before current year | 163 | 64
Originated two years before current year | 113 | 171
Originated one year before current year | 66 | 141
Originated in current fiscal year | 0 | 22
Revolving Loans | 5 | 4
Revolving to Term Loans | 2 | 3
Total loans | 1,264 | 1,178
Home equity |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 0 | 116
Originated four years before current year | 642 | 249
Originated three years before current year | 545 | 891
Originated two years before current year | 1,078 | 444
Originated one year before current year | 0 | 1,034
Originated in current fiscal year | 0 | 1
Revolving Loans | 515,336 | 529,369
Revolving to Term Loans | 23,548 | 24,310
Total loans | 541,149 | 556,414
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 541,149 | 556,414
Home equity | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 5,057 | 4,254
Home equity | Auto |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Home equity | Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 0 | 0
Home equity | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 0 | 0
Originated four years before current year | 642 | 238
Originated three years before current year | 418 | 891
Originated two years before current year | 980 | 444
Originated one year before current year | 0 | 997
Originated in current fiscal year | 0 | 1
Revolving Loans | 515,235 | 529,275
Revolving to Term Loans | 18,817 | 20,314
Total loans | 536,092 | 552,160
Home equity | Nonperforming |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 0 | 116
Originated four years before current year | 0 | 11
Originated three years before current year | 127 | 0
Originated two years before current year | 98 | 0
Originated one year before current year | 0 | 37
Originated in current fiscal year | 0 | 0
Revolving Loans | 101 | 94
Revolving to Term Loans | 4,731 | 3,996
Total loans | 5,057 | 4,254
Consumer credit |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Total loans | 1,578,953 | 1,635,123
Pass | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 352,978 | 262,538
Originated four years before current year | 216,956 | 124,041
Originated three years before current year | 125,661 | 227,710
Originated two years before current year | 374,639 | 171,228
Originated one year before current year | 1,201,910 | 420,736
Originated in current fiscal year | 762,646 | 1,675,964
Revolving Loans | 502,589 | 549,849
Revolving to Term Loans | 175,782 | 148,508
Total loans | 3,713,161 | 3,580,574
Pass | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 882,164 | 513,658
Originated four years before current year | 657,154 | 496,086
Originated three years before current year | 737,708 | 677,119
Originated two years before current year | 1,012,914 | 749,102
Originated one year before current year | 1,572,509 | 1,041,305
Originated in current fiscal year | 332,598 | 1,537,226
Revolving Loans | 15,838 | 28,122
Revolving to Term Loans | 371,889 | 382,219
Total loans | 5,582,774 | 5,424,837
Pass | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 24,250 | 5,327
Originated four years before current year | 34,384 | 24,946
Originated three years before current year | 45,832 | 36,288
Originated two years before current year | 67,742 | 49,875
Originated one year before current year | 89,186 | 73,913
Originated in current fiscal year | 20,540 | 94,828
Revolving Loans | 42,521 | 52,393
Revolving to Term Loans | 19,818 | 19,353
Total loans | 344,273 | 356,923
Criticized | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 5,187 | 5,369
Originated four years before current year | 6,726 | 3,383
Originated three years before current year | 27,901 | 9,508
Originated two years before current year | 8,053 | 15,003
Originated one year before current year | 21,742 | 9,603
Originated in current fiscal year | 4,788 | 23,982
Revolving Loans | 4,924 | 10,307
Revolving to Term Loans | 3,226 | 2,685
Total loans | 82,547 | 79,840
Criticized | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 38,716 | 33,490
Originated four years before current year | 42,544 | 17,648
Originated three years before current year | 14,260 | 46,994
Originated two years before current year | 31,909 | 26,464
Originated one year before current year | 4,845 | 49,271
Originated in current fiscal year | 2,277 | 6,874
Revolving Loans | 0 | 0
Revolving to Term Loans | 23,851 | 19,804
Total loans | 158,402 | 200,545
Criticized | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 271 | 0
Originated four years before current year | 205 | 643
Originated three years before current year | 469 | 414
Originated two years before current year | 1,334 | 621
Originated one year before current year | 1,404 | 1,403
Originated in current fiscal year | 0 | 1,599
Revolving Loans | 530 | 868
Revolving to Term Loans | 1,203 | 1,259
Total loans | 5,416 | 6,807
Classified - Substandard | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 10,711 | 8,441
Originated four years before current year | 9,892 | 2,774
Originated three years before current year | 11,267 | 9,836
Originated two years before current year | 8,124 | 10,077
Originated one year before current year | 4,594 | 6,369
Originated in current fiscal year | 502 | 6,501
Revolving Loans | 3,926 | 15,344
Revolving to Term Loans | 2,691 | 3,049
Total loans | 51,707 | 62,391
Classified - Substandard | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 18,346 | 8,665
Originated four years before current year | 23,368 | 5,308
Originated three years before current year | 12,244 | 26,691
Originated two years before current year | 7,743 | 13,565
Originated one year before current year | 13,432 | 4,700
Originated in current fiscal year | 370 | 11,451
Revolving Loans | 13,157 | 0
Revolving to Term Loans | 585 | 2,911
Total loans | 89,245 | 73,291
Classified - Substandard | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 0 | 0
Originated four years before current year | 239 | 33
Originated three years before current year | 506 | 246
Originated two years before current year | 1,442 | 195
Originated one year before current year | 230 | 1,417
Originated in current fiscal year | 0 | 233
Revolving Loans | 320 | 317
Revolving to Term Loans | 673 | 701
Total loans | 3,410 | 3,142
Classified - Nonaccrual | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 1,243 | 4,379
Originated four years before current year | 6,674 | 49
Originated three years before current year | 3,600 | 6,951
Originated two years before current year | 1,695 | 4,701
Originated one year before current year | 3,519 | 3,754
Originated in current fiscal year | 1,236 | 2,600
Revolving Loans | 878 | 778
Revolving to Term Loans | 7,166 | 7,013
Total loans | 26,011 | 30,225
Classified - Nonaccrual | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 13,514 | 12,564
Originated four years before current year | 7,980 | 1,635
Originated three years before current year | 3,857 | 9,456
Originated two years before current year | 2,049 | 5,393
Originated one year before current year | 2,448 | 2,054
Originated in current fiscal year | 0 | 1,408
Revolving Loans | 0 | 0
Revolving to Term Loans | 280 | 313
Total loans | 30,128 | 32,823
Classified - Nonaccrual | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 0 | 0
Originated four years before current year | 245 | 0
Originated three years before current year | 489 | 200
Originated two years before current year | 490 | 134
Originated one year before current year | 37 | 551
Originated in current fiscal year | 0 | 161
Revolving Loans | 0 | 89
Revolving to Term Loans | 1,139 | 1,466
Total loans | 2,400 | 2,601
Classified - Doubtful | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 2,566 | 610
Originated four years before current year | 2,540 | 296
Originated three years before current year | 1,705 | 2,748
Originated two years before current year | 692 | 1,016
Originated one year before current year | 0 | 0
Originated in current fiscal year | 0 | 0
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total loans | 7,503 | 4,670
Classified - Doubtful | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 21,910 | 3,274
Originated four years before current year | 20,770 | 19,283
Originated three years before current year | 835 | 18,926
Originated two years before current year | 1,788 | 0
Originated one year before current year | 0 | 1,832
Originated in current fiscal year | 0 | 0
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total loans | 45,303 | 43,315
Classified - Doubtful | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Originated more than five years before current fiscal year | 191 | 30
Originated four years before current year | 44 | 0
Originated three years before current year | 491 | 70
Originated two years before current year | 25 | 847
Originated one year before current year | 0 | 3
Originated in current fiscal year | 0 | 0
Revolving Loans | 0 | 0
Revolving to Term Loans | 0 | 0
Total loans | $ 751 | $ 950

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