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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | $ 157,240
Current |  |  |  | 11,960,284
Total loans | $ 13,786,479 |  |  | 12,117,524
Nonaccrual | 147,339 | $ 137,611 | $ 132,431 | 126,412
Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 69,967 |  |  |
Current | 13,716,512 |  |  |
Total loans | 13,786,479 |  | 12,122,002 |
Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 3,292 |  |  |
Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 14,607 |  |  |
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 41,023
Current |  |  |  | 2,849,273
Total loans | 3,956,422 |  |  | 2,890,296
Nonaccrual | 34,895 | 34,188 | 40,103 | 39,036
Commercial | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 5,741 |  |  |
Current | 3,751,959 |  |  |
Total loans | 3,757,700 |  | 2,817,833 |
Commercial | Commercial Real Estate - Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans |  |  |  | 713,092
Commercial | Commercial Real Estate - Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans |  |  |  | 4,453,700
Commercial | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 394 |  |  |
Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 893 |  |  |
Commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 5,946,512 |  |  | 5,166,792
Nonaccrual | 76,138 | 67,859 | 58,350 |
Commercial real estate | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 28,287 |  |  |
Current | 5,746,524 |  |  |
Total loans | 5,774,811 |  | 4,890,890 |
Commercial real estate | Commercial Real Estate - Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 13,116
Current |  |  |  | 699,976
Nonaccrual |  |  |  | 12,929
Commercial real estate | Commercial Real Estate - Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 48,107
Current |  |  |  | 4,405,593
Nonaccrual |  |  |  | 45,038
Commercial real estate | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 0 |  |  |
Commercial real estate | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 13,685 |  |  |
BBCC |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Nonaccrual | 3,551 | 3,601 | 4,530 |
BBCC | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 1,837 |  |  |
Current | 368,586 |  |  |
Total loans | 370,423 |  | 352,714 |
BBCC | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 134 |  |  |
BBCC | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 0 |  |  |
Residential real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 34,523
Current |  |  |  | 2,299,766
Total loans | 2,248,422 |  |  | 2,334,289
Nonaccrual | 24,794 | 23,914 | 20,970 | 21,023
Residential real estate | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 22,601 |  |  |
Current | 2,225,821 |  |  |
Total loans | 2,248,422 |  | 2,334,394 |
Residential real estate | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 0 |  |  |
Residential real estate | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 0 |  |  |
Indirect |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 913,902 |  |  |
Nonaccrual | 2,529 | 2,619 | 3,318 |
Indirect | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 6,674 |  |  |
Current | 907,228 |  |  |
Total loans | 913,902 |  | 935,594 |
Indirect | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 2,529 |  |  |
Indirect | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 0 |  |  |
Direct |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 164,807 |  |  |
Nonaccrual | 1,178 | 1,264 | 1,303 |
Direct | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 1,712 |  |  |
Current | 163,095 |  |  |
Total loans | 164,807 |  | 228,526 |
Direct | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 235 |  |  |
Direct | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 29 |  |  |
Home equity |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 556,414 |  |  |
Nonaccrual | 4,254 | $ 4,166 | 3,857 |
Home equity | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 3,115 |  |  |
Current | 553,299 |  |  |
Total loans | 556,414 |  | $ 562,051 |
Home equity | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 0 |  |  |
Home equity | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 0 |  |  |
Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Total loans | 1,635,123 |  |  | 1,726,147
Consumer | Home Equity Line of Credit |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 5,466
Current |  |  |  | 553,555
Total loans |  |  |  | 559,021
Nonaccrual |  |  |  | 3,785
Consumer | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 12,304
Current |  |  |  | 1,004,983
Total loans |  |  |  | 1,017,287
Nonaccrual |  |  |  | 3,527
Consumer | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 2,701
Current |  |  |  | 147,138
Total loans |  |  |  | 149,839
Nonaccrual |  |  |  | 1,074
30-59 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 25,049
30-59 Days Past Due | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 23,447 |  |  |
30-59 Days Past Due | Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 1,489
30-59 Days Past Due | Commercial | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 2,977 |  |  |
30-59 Days Past Due | Commercial real estate | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 887 |  |  |
30-59 Days Past Due | Commercial real estate | Commercial Real Estate - Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 187
30-59 Days Past Due | Commercial real estate | Commercial Real Estate - Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 2,223
30-59 Days Past Due | BBCC | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 894 |  |  |
30-59 Days Past Due | Residential real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 11,054
30-59 Days Past Due | Residential real estate | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 11,639 |  |  |
30-59 Days Past Due | Indirect | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 5,222 |  |  |
30-59 Days Past Due | Direct | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 753 |  |  |
30-59 Days Past Due | Home equity | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 1,075 |  |  |
30-59 Days Past Due | Consumer | Home Equity Line of Credit |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 1,020
30-59 Days Past Due | Consumer | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 7,704
30-59 Days Past Due | Consumer | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 1,372
60-89 Days Past Due |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 5,209
60-89 Days Past Due | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 6,840 |  |  |
60-89 Days Past Due | Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 498
60-89 Days Past Due | Commercial | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 664 |  |  |
60-89 Days Past Due | Commercial real estate | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 128 |  |  |
60-89 Days Past Due | Commercial real estate | Commercial Real Estate - Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 0
60-89 Days Past Due | Commercial real estate | Commercial Real Estate - Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 665
60-89 Days Past Due | BBCC | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 882 |  |  |
60-89 Days Past Due | Residential real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 2,426
60-89 Days Past Due | Residential real estate | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 3,296 |  |  |
60-89 Days Past Due | Indirect | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 960 |  |  |
60-89 Days Past Due | Direct | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 533 |  |  |
60-89 Days Past Due | Home equity | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 377 |  |  |
60-89 Days Past Due | Consumer | Home Equity Line of Credit |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 554
60-89 Days Past Due | Consumer | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 919
60-89 Days Past Due | Consumer | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 147
Past Due 90 Days or More |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 570
Past Due 90 Days or More | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 39,680 |  |  |
Past Due 90 Days or More | Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 0
Past Due 90 Days or More | Commercial | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 2,100 |  |  |
Past Due 90 Days or More | Commercial real estate | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 27,272 |  |  |
Past Due 90 Days or More | Commercial real estate | Commercial Real Estate - Construction |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 0
Past Due 90 Days or More | Commercial real estate | Commercial Real Estate - Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 181
Past Due 90 Days or More | BBCC | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 61 |  |  |
Past Due 90 Days or More | Residential real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 20
Past Due 90 Days or More | Residential real estate | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 7,666 |  |  |
Past Due 90 Days or More | Indirect | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 492 |  |  |
Past Due 90 Days or More | Direct | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | 426 |  |  |
Past Due 90 Days or More | Home equity | Adjusted Balance |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due | $ 1,663 |  |  |
Past Due 90 Days or More | Consumer | Home Equity Line of Credit |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 107
Past Due 90 Days or More | Consumer | Auto |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | 154
Past Due 90 Days or More | Consumer | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due |  |  |  | $ 108

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