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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | $ 13,925,261 | $ 13,786,479
Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 65,392 | 69,967
Current | 13,859,869 | 13,716,512
Total loans | 13,925,261 | 13,786,479
Commercial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 4,068,896 | 3,956,422
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 6,645 | 5,741
Current | 3,874,284 | 3,751,959
Total loans | 3,880,929 | 3,757,700
Commercial real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 6,074,135 | 5,946,512
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 35,700 | 28,287
Current | 5,870,152 | 5,746,524
Total loans | 5,905,852 | 5,774,811
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 273 | 1,837
Current | 355,977 | 368,586
Total loans | 356,250 | 370,423
Residential real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 2,203,277 | 2,248,422
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 16,008 | 22,601
Current | 2,187,269 | 2,225,821
Total loans | 2,203,277 | 2,248,422
Indirect |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 887,333 | 913,902
Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 3,068 | 6,674
Current | 884,265 | 907,228
Total loans | 887,333 | 913,902
Direct |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 150,471 | 164,807
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 1,087 | 1,712
Current | 149,384 | 163,095
Total loans | 150,471 | 164,807
Home equity |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total loans | 541,149 | 556,414
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 2,611 | 3,115
Current | 538,538 | 553,299
Total loans | 541,149 | 556,414
30-59 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 18,012 | 23,447
30-59 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 3,141 | 2,977
30-59 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 2,586 | 887
30-59 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 103 | 894
30-59 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 9,067 | 11,639
30-59 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 2,124 | 5,222
30-59 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 639 | 753
30-59 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 352 | 1,075
60-89 Days Past Due | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 1,416 | 6,840
60-89 Days Past Due | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 0 | 664
60-89 Days Past Due | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 159 | 128
60-89 Days Past Due | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 84 | 882
60-89 Days Past Due | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 217 | 3,296
60-89 Days Past Due | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 475 | 960
60-89 Days Past Due | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 134 | 533
60-89 Days Past Due | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 347 | 377
Past Due 90 Days or More | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 45,964 | 39,680
Past Due 90 Days or More | Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 3,504 | 2,100
Past Due 90 Days or More | Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 32,955 | 27,272
Past Due 90 Days or More | BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 86 | 61
Past Due 90 Days or More | Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 6,724 | 7,666
Past Due 90 Days or More | Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 469 | 492
Past Due 90 Days or More | Direct | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | 314 | 426
Past Due 90 Days or More | Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Past due | $ 1,912 | $ 1,663

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