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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | $ 36,285,887 | $ 32,991,927 |  |
Allowance for credit losses on loans | (392,522) | (307,610) | $ (303,671) | $ (107,341)
Net loans | 35,893,365 | 32,684,317 |  |
Taxable | 2,139,437 | 1,815,390 | 1,177,816 |
Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 0 | 0 |  |
Net loans | 0 | 0 |  |
Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 36,285,887 | 32,991,927 |  |
Allowance for credit losses on loans | (392,522) | (307,610) |  |
Net loans | 35,893,365 | 32,684,317 |  |
Taxable | 163,300 | 93,700 |  |
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 10,288,560 | 9,512,230 |  |
Allowance for credit losses on loans | (148,722) | (118,333) | (120,612) | (27,232)
Commercial | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | (232,301) | (232,764) |  |
Commercial | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 10,056,259 | 9,279,466 |  |
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 16,307,486 | 14,140,629 |  |
Allowance for credit losses on loans | (200,309) | (155,099) | (138,244) | (64,004)
Commercial real estate | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | (174,438) | (169,058) |  |
Commercial real estate | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 16,133,048 | 13,971,571 |  |
BBCC |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for credit losses on loans | (2,813) | (2,887) | (2,431) | (2,458)
BBCC | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 406,739 | 401,822 |  |
BBCC | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 406,739 | 401,822 |  |
Residential real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 6,797,586 | 6,699,443 |  |
Allowance for credit losses on loans | (22,922) | (20,837) | (21,916) | (9,347)
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 | 6,797,586 | 6,699,443 |  |
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 2,892,255 | 2,639,625 |  |
Consumer | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | (2,892,255) | (2,639,625) |  |
Indirect |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,096,778 | 1,050,982 |  |
Allowance for credit losses on loans | (8,434) | (1,236) | (1,532) | (1,743)
Indirect | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,096,778 | 1,050,982 |  |
Indirect | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,096,778 | 1,050,982 |  |
Direct |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 514,144 | 523,172 |  |
Allowance for credit losses on loans | (2,304) | (3,169) | (12,116) | (528)
Direct | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 514,144 | 523,172 |  |
Direct | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 514,144 | 523,172 |  |
Home equity |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,281,333 | 1,065,471 |  |
Allowance for credit losses on loans | (7,018) | (6,049) | $ (6,820) | $ (2,029)
Home equity | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,281,333 | 1,065,471 |  |
Home equity | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,281,333 | 1,065,471 |  |
Direct Finance Leases |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | $ 120,600 | $ 169,700 |  |

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