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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | $ 33,623,319 | $ 32,991,927
Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 33,623,319 | 32,991,927
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 9,648,269 | 9,512,230
Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 9,416,224 | 9,279,466
Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 14,653,958 | 14,140,629
Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 14,481,299 | 13,971,571
BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 404,704 | 401,822
Residential real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 6,661,379 | 6,699,443
Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 6,661,379 | 6,699,443
Indirect |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,091,998 | 1,050,982
Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,091,998 | 1,050,982
Direct |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 506,305 | 523,172
Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 506,305 | 523,172
Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,061,410 | 1,065,471
Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,061,410 | 1,065,471
Total Past Due | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 176,425 | 133,465
Total Past Due | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 21,742 | 22,321
Total Past Due | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 69,221 | 44,995
Total Past Due | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 3,619 | 2,479
Total Past Due | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 50,565 | 27,974
Total Past Due | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 8,044 | 10,221
Total Past Due | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 9,320 | 8,678
Total Past Due | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 13,914 | 16,797
30-59 Days Past Due | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 66,711 | 59,187
30-59 Days Past Due | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 10,099 | 16,128
30-59 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 8,838 | 9,081
30-59 Days Past Due | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,268 | 1,368
30-59 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 31,319 | 12,358
30-59 Days Past Due | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 5,488 | 7,025
30-59 Days Past Due | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 4,751 | 5,436
30-59 Days Past Due | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 4,948 | 7,791
60-89 Days Past Due | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 39,116 | 12,743
60-89 Days Past Due | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,620 | 1,332
60-89 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 27,844 | 5,254
60-89 Days Past Due | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,111 | 134
60-89 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 5,030 | 367
60-89 Days Past Due | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,351 | 1,854
60-89 Days Past Due | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,115 | 1,455
60-89 Days Past Due | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,045 | 2,347
Past Due 90 Days or More | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 70,598 | 61,535
Past Due 90 Days or More | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 10,023 | 4,861
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 | 32,539 | 30,660
Past Due 90 Days or More | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,240 | 977
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 | 14,216 | 15,249
Past Due 90 Days or More | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,205 | 1,342
Past Due 90 Days or More | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 3,454 | 1,787
Past Due 90 Days or More | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 7,921 | 6,659
Current | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 33,446,894 | 32,858,462
Current | Commercial | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 9,394,482 | 9,257,145
Current | Commercial real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 14,412,078 | 13,926,576
Current | BBCC | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 401,085 | 399,343
Current | Residential real estate | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 6,610,814 | 6,671,469
Current | Indirect | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 1,083,954 | 1,040,761
Current | Direct | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | 496,985 | 514,494
Current | Home equity | Portfolio Segment After Reclassifications |  |
Financing Receivable, Past Due [Line Items] |  |
Total loans, net of unearned income | $ 1,047,496 | $ 1,048,674

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