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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | $ 36,413,944 | $ 36,285,887
Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 36,413,944 | 36,285,887
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 10,650,615 | 10,288,560
Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 10,430,466 | 10,056,259
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 16,135,327 | 16,307,486
Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 15,961,366 | 16,133,048
BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 394,110 | 406,739
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 6,771,694 | 6,797,586
Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 6,771,694 | 6,797,586
Indirect |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,070,536 | 1,096,778
Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,070,536 | 1,096,778
Direct |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 511,455 | 514,144
Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 511,455 | 514,144
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,274,317 | 1,281,333
Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,274,317 | 1,281,333
Total Past Due | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 259,114 | 283,006
Total Past Due | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 80,438 | 65,248
Total Past Due | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 86,907 | 92,113
Total Past Due | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 3,655 | 3,518
Total Past Due | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 60,518 | 88,114
Total Past Due | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 10,395 | 13,838
Total Past Due | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 3,912 | 4,444
Total Past Due | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 13,289 | 15,731
30-59 Days Past Due | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 90,683 | 92,237
30-59 Days Past Due | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 21,038 | 5,970
30-59 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 22,945 | 19,240
30-59 Days Past Due | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 987 | 1,227
30-59 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 31,566 | 49,331
30-59 Days Past Due | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 7,307 | 9,700
30-59 Days Past Due | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,264 | 2,004
30-59 Days Past Due | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 5,576 | 4,765
60-89 Days Past Due | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 15,946 | 44,739
60-89 Days Past Due | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 2,945 | 12,021
60-89 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,977 | 12,728
60-89 Days Past Due | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 707 | 861
60-89 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 6,104 | 12,085
60-89 Days Past Due | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,807 | 2,675
60-89 Days Past Due | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,019 | 970
60-89 Days Past Due | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,387 | 3,399
Past Due 90 Days or More | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 152,485 | 146,030
Past Due 90 Days or More | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 56,455 | 47,257
Past Due 90 Days or More | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 61,985 | 60,145
Past Due 90 Days or More | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,961 | 1,430
Past Due 90 Days or More | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 22,848 | 26,698
Past Due 90 Days or More | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,281 | 1,463
Past Due 90 Days or More | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,629 | 1,470
Past Due 90 Days or More | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 6,326 | 7,567
Current | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 36,154,830 | 36,002,881
Current | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 10,350,028 | 9,991,011
Current | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 15,874,459 | 16,040,935
Current | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 390,455 | 403,221
Current | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 6,711,176 | 6,709,472
Current | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,060,141 | 1,082,940
Current | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 507,543 | 509,700
Current | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | $ 1,261,028 | $ 1,265,602

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