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Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | $ 32,991,927 | $ 31,123,641 |  |
Allowance for credit losses on loans | (307,610) | (303,671) | $ (107,341) | $ (131,388)
Net loans | 32,684,317 | 30,819,970 |  |
Taxable | 1,815,390 | 1,177,816 | 490,042 |
Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 0 | 0 |  |
Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 32,991,927 | 31,123,641 |  |
Allowance for credit losses on loans | (307,610) | (303,671) |  |
Net loans | 32,684,317 | 30,819,970 |  |
Taxable | 93,700 | 126,700 |  |
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 9,512,230 | 9,508,904 |  |
Allowance for credit losses on loans | (118,333) | (120,612) | (27,232) | (30,567)
Commercial | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | (232,764) | (210,280) |  |
Commercial | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 9,279,466 | 9,298,624 |  |
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 14,140,629 | 12,457,070 |  |
Allowance for credit losses on loans | (155,099) | (138,244) | (64,004) | (75,810)
Commercial real estate | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | (169,058) | (158,322) |  |
Commercial real estate | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 13,971,571 | 12,298,748 |  |
BBCC |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for credit losses on loans | (2,887) | (2,431) | (2,458) | (6,120)
BBCC | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 401,822 | 368,602 |  |
BBCC | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 401,822 | 368,602 |  |
Residential real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 6,699,443 | 6,460,441 |  |
Allowance for credit losses on loans | (20,837) | (21,916) | (9,347) | (12,608)
Residential real estate | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 0 | 0 |  |
Residential real estate | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 6,699,443 | 6,460,441 |  |
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 2,639,625 | 2,697,226 |  |
Consumer | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | (2,639,625) | (2,697,226) |  |
Indirect |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,050,982 | 1,034,257 |  |
Allowance for credit losses on loans | (1,236) | (1,532) | (1,743) | (3,580)
Indirect | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,050,982 | 1,034,257 |  |
Indirect | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,050,982 | 1,034,257 |  |
Direct |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 523,172 | 629,186 |  |
Allowance for credit losses on loans | (3,169) | (12,116) | (528) | (855)
Direct | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 523,172 | 629,186 |  |
Direct | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 523,172 | 629,186 |  |
Home equity |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,065,471 | 1,033,783 |  |
Allowance for credit losses on loans | (6,049) | (6,820) | $ (2,029) | $ (1,848)
Home equity | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,065,471 | 1,033,783 |  |
Home equity | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,065,471 | 1,033,783 |  |
Direct Finance Leases |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | $ 169,700 | $ 188,100 |  |

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