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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 36,285,887	$ 32,991,927
Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	36,285,887	32,991,927
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	10,288,560	9,512,230
Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	10,056,259	9,279,466
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	16,307,486	14,140,629
Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	16,133,048	13,971,571
BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	406,739	401,822
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,797,586	6,699,443
Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,797,586	6,699,443
Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,096,778	1,050,982
Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,096,778	1,050,982
Direct
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	514,144	523,172
Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	514,144	523,172
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,281,333	1,065,471
Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,281,333	1,065,471
Total Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	283,006	133,465
Total Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	65,248	22,321
Total Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	92,113	44,995
Total Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	3,518	2,479
Total Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	88,114	27,974
Total Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	13,838	10,221
Total Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	4,444	8,678
Total Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	15,731	16,797
30-59 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	92,237	59,187
30-59 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	5,970	16,128
30-59 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	19,240	9,081
30-59 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,227	1,368
30-59 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	49,331	12,358
30-59 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,700	7,025
30-59 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,004	5,436
30-59 Days Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	4,765	7,791
60-89 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	44,739	12,743
60-89 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	12,021	1,332
60-89 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	12,728	5,254
60-89 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	861	134
60-89 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	12,085	367
60-89 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,675	1,854
60-89 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	970	1,455
60-89 Days Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	3,399	2,347
Past Due 90 Days or More | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	146,030	61,535
Past Due 90 Days or More | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	47,257	4,861
Past Due 90 Days or More | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	60,145	30,660
Past Due 90 Days or More | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,430	977
Past Due 90 Days or More | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	26,698	15,249
Past Due 90 Days or More | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,463	1,342
Past Due 90 Days or More | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,470	1,787
Past Due 90 Days or More | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	7,567	6,659
Current | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	36,002,881	32,858,462
Current | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,991,011	9,257,145
Current | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	16,040,935	13,926,576
Current | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	403,221	399,343
Current | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,709,472	6,671,469
Current | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,082,940	1,040,761
Current | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	509,700	514,494
Current | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 1,265,602	$ 1,048,674

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