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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | $ 47,967,915 | $ 36,285,887
Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 47,967,915 | 36,285,887
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 14,506,375 | 10,288,560
Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 14,286,787 | 10,056,259
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 22,083,734 | 16,307,486
Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 21,910,802 | 16,133,048
BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 392,520 | 406,739
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 8,190,127 | 6,797,586
Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 8,190,127 | 6,797,586
Indirect |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,058,734 | 1,096,778
Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,058,734 | 1,096,778
Direct |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 589,133 | 514,144
Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 589,133 | 514,144
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,539,812 | 1,281,333
Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,539,812 | 1,281,333
Total Past Due | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 411,451 | 283,006
Total Past Due | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 110,539 | 65,248
Total Past Due | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 177,287 | 92,113
Total Past Due | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 3,913 | 3,518
Total Past Due | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 85,597 | 88,114
Total Past Due | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 11,626 | 13,838
Total Past Due | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 4,409 | 4,444
Total Past Due | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 18,080 | 15,731
30-59 Days Past Due | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 71,057 | 92,237
30-59 Days Past Due | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 13,443 | 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 | 6,057 | 19,240
30-59 Days Past Due | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 909 | 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 | 34,312 | 49,331
30-59 Days Past Due | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 8,178 | 9,700
30-59 Days Past Due | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,644 | 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 | 6,514 | 4,765
60-89 Days Past Due | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 71,888 | 44,739
60-89 Days Past Due | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 30,769 | 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 | 18,547 | 12,728
60-89 Days Past Due | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,610 | 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 | 15,472 | 12,085
60-89 Days Past Due | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 2,231 | 2,675
60-89 Days Past Due | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 856 | 970
60-89 Days Past Due | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 2,403 | 3,399
Past Due 90 Days or More | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 268,506 | 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 | 66,327 | 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 | 152,683 | 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 | 1,394 | 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 | 35,813 | 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 | 1,217 | 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 | 1,909 | 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 | 9,163 | 7,567
Current | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 47,556,464 | 36,002,881
Current | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 14,176,248 | 9,991,011
Current | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 21,733,515 | 16,040,935
Current | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 388,607 | 403,221
Current | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 8,104,530 | 6,709,472
Current | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,047,108 | 1,082,940
Current | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 584,724 | 509,700
Current | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | $ 1,521,732 | $ 1,265,602

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