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Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | $ 13,601,846 | $ 13,786,479 |
Allowance for credit losses | (107,341) | (131,388) | $ (54,619)
Net loans | 13,494,505 | 13,655,091 |
Segment Portfolio Reclassification |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 0 | 0 |
Segment Portfolio Reclassification, Adjusted Balance |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 13,601,846 | 13,786,479 |
Allowance for credit losses | (107,341) | (131,388) |
Net loans | 13,494,505 | 13,655,091 |
Commercial |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 3,391,769 | 3,956,422 |
Allowance for credit losses | (27,232) | (30,567) | (21,359)
Commercial | Segment Portfolio Reclassification |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | (191,557) | (198,722) |
Commercial | Segment Portfolio Reclassification, Adjusted Balance |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 3,200,212 | 3,757,700 |
Commercial | PPP Loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 169,000 | 943,000 |
Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 6,380,674 | 5,946,512 |
Allowance for credit losses | (64,004) | (75,810) | (20,535)
Commercial real estate | Segment Portfolio Reclassification |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | (159,190) | (171,701) |
Commercial real estate | Segment Portfolio Reclassification, Adjusted Balance |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 6,221,484 | 5,774,811 |
BBCC |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for credit losses | (2,458) | (6,120) | (2,279)
BBCC | Segment Portfolio Reclassification |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 350,747 | 370,423 |
BBCC | Segment Portfolio Reclassification, Adjusted Balance |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 350,747 | 370,423 |
Residential real estate |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 2,255,289 | 2,248,422 |
Allowance for credit losses | (9,347) | (12,608) | (2,299)
Residential real estate | Segment Portfolio Reclassification |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 0 | 0 |
Residential real estate | Segment Portfolio Reclassification, Adjusted Balance |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 2,255,289 | 2,248,422 |
Consumer |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 1,574,114 | 1,635,123 |
Consumer | Segment Portfolio Reclassification |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | (1,574,114) | (1,635,123) |
Indirect |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 873,139 | 913,902 |
Allowance for credit losses | (1,743) | (3,580) | (5,319)
Indirect | Segment Portfolio Reclassification |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 873,139 | 913,902 |
Indirect | Segment Portfolio Reclassification, Adjusted Balance |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 873,139 | 913,902 |
Direct |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 140,385 | 164,807 |
Allowance for credit losses | (528) | (855) | (1,863)
Direct | Segment Portfolio Reclassification |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 140,385 | 164,807 |
Direct | Segment Portfolio Reclassification, Adjusted Balance |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 140,385 | 164,807 |
Home equity |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 560,590 | 556,414 |
Allowance for credit losses | (2,029) | (1,848) | $ (965)
Home equity | Segment Portfolio Reclassification |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 560,590 | 556,414 |
Home equity | Segment Portfolio Reclassification, Adjusted Balance |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | 560,590 | 556,414 |
Direct Finance Leases |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Total loans, net of unearned income | $ 25,100 | $ 32,300 |

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