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Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | $ 13,584,828 |  | $ 13,786,479 |  |  |
Allowance for credit losses | (107,868) | $ (109,444) | (131,388) | $ (131,388) | $ (128,394) | $ (54,619)
Net loans | 13,476,960 |  | 13,655,091 |  |  |
Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 0 |  |  |  |  |
Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 13,584,828 |  | 13,786,479 |  |  |
Allowance for credit losses | (107,868) |  | (131,388) |  |  |
Net loans | 13,476,960 |  | 13,655,091 |  |  |
Commercial |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 3,505,183 |  | 3,956,422 |  |  |
Allowance for credit losses | (26,160) | (25,731) | (30,567) | (28,393) | (29,618) | (21,359)
Commercial | PPP Loans |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 354,900 |  | 943,000 |  |  |
Commercial | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (192,390) |  |  |  |  |
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 3,312,793 |  | 3,757,700 |  |  |
Commercial real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 6,290,632 |  | 5,946,512 |  |  |
Allowance for credit losses | (65,097) | (65,469) | (75,810) | (75,912) | (71,069) | (20,535)
Commercial real estate | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (158,297) |  |  |  |  |
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 6,132,335 |  | 5,774,811 |  |  |
BBCC |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Allowance for credit losses | (2,562) | (2,798) | (6,120) | (6,337) | (6,332) | (2,279)
BBCC | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 350,687 |  |  |  |  |
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 350,687 |  | 370,423 |  |  |
Residential real estate |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 2,224,782 |  | 2,248,422 |  |  |
Allowance for credit losses | (9,526) | (10,419) | (12,608) | (13,924) | (14,244) | (2,299)
Residential real estate | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 0 |  |  |  |  |
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 2,224,782 |  | 2,248,422 |  |  |
Consumer credit |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 1,564,231 |  | 1,635,123 |  |  |
Consumer credit | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | (1,564,231) |  |  |  |  |
Indirect |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 860,785 |  | 913,902 |  |  |
Allowance for credit losses | (1,861) | (2,043) | (3,580) | (4,090) | (4,453) | (5,319)
Indirect | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 860,785 |  |  |  |  |
Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 860,785 |  | 913,902 |  |  |
Direct |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 149,124 |  | 164,807 |  |  |
Allowance for credit losses | (586) | (640) | (855) | (825) | (835) | (1,863)
Direct | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 149,124 |  |  |  |  |
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 149,124 |  | 164,807 |  |  |
Home equity |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 554,322 |  | 556,414 |  |  |
Allowance for credit losses | (2,076) | $ (2,344) | (1,848) | $ (1,907) | $ (1,843) | $ (965)
Home equity | Segment Portfolio Reclassification |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 554,322 |  |  |  |  |
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | 554,322 |  | 556,414 |  |  |
Direct Finance Leases |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |  |  |
Total loans | $ 26,000 |  | $ 32,300 |  |  |

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