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Loans and Allowance for Credit Losses - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | $ 36,413,944 |  | $ 36,285,887 |
Allowance for credit losses on loans | (401,932) | $ (319,713) | (392,522) | $ (307,610)
Net loans | 36,012,012 |  | 35,893,365 |
Taxable | 515,766 | 487,361 |  |
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 | 36,413,944 |  | 36,285,887 |
Allowance for credit losses on loans | (401,932) |  | (392,522) |
Net loans | 36,012,012 |  | 35,893,365 |
Taxable | 122,300 |  | 163,300 |
Commercial |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 10,650,615 |  | 10,288,560 |
Allowance for credit losses on loans | (157,587) | (123,437) | (148,722) | (118,333)
Commercial | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | (220,149) |  | (232,301) |
Commercial | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 10,430,466 |  | 10,056,259 |
Commercial real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 16,135,327 |  | 16,307,486 |
Allowance for credit losses on loans | (198,110) | (160,640) | (200,309) | (155,099)
Commercial real estate | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | (173,961) |  | (174,438) |
Commercial real estate | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 15,961,366 |  | 16,133,048 |
BBCC |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Allowance for credit losses on loans | (2,695) | (3,163) | (2,813) | (2,887)
BBCC | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 394,110 |  | 406,739 |
BBCC | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 394,110 |  | 406,739 |
Residential real estate |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 6,771,694 |  | 6,797,586 |
Allowance for credit losses on loans | (24,214) | (21,899) | (22,922) | (20,837)
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 | 6,771,694 |  | 6,797,586 |
Consumer |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 2,856,308 |  | 2,892,255 |
Consumer | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | (2,856,308) |  | (2,892,255) |
Indirect |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,070,536 |  | 1,096,778 |
Allowance for credit losses on loans | (9,063) | (1,218) | (8,434) | (1,236)
Indirect | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,070,536 |  | 1,096,778 |
Indirect | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,070,536 |  | 1,096,778 |
Direct |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 511,455 |  | 514,144 |
Allowance for credit losses on loans | (2,053) | (2,952) | (2,304) | (3,169)
Direct | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 511,455 |  | 514,144 |
Direct | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 511,455 |  | 514,144 |
Home equity |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,274,317 |  | 1,281,333 |
Allowance for credit losses on loans | (8,210) | $ (6,404) | (7,018) | $ (6,049)
Home equity | Portfolio Segment Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,274,317 |  | 1,281,333 |
Home equity | Portfolio Segment After Reclassifications |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | 1,274,317 |  | 1,281,333 |
Direct Finance Leases |  |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |  |
Total loans, net of unearned income | $ 107,500 |  | $ 120,600 |

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