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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