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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	$ 36,400,643	$ 32,991,927
Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	36,400,643	32,991,927
Commercial
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,408,095	9,512,230
Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,183,363	9,279,466
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	16,356,216	14,140,629
Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	16,180,588	13,971,571
BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	400,360	401,822
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,757,896	6,699,443
Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,757,896	6,699,443
Indirect
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,096,234	1,050,982
Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,096,234	1,050,982
Direct
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	419,201	523,172
Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	419,201	523,172
Home equity
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,363,001	1,065,471
Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,363,001	1,065,471
Total Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	195,856	133,465
Total Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	53,877	22,321
Total Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	98,411	44,995
Total Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	2,456	2,479
Total Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	9,046	27,974
Total Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	11,088	10,221
Total Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	4,661	8,678
Total Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	16,317	16,797
30-59 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	53,940	59,187
30-59 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	11,690	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	20,125	9,081
30-59 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,095	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	5,817	12,358
30-59 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	7,702	7,025
30-59 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	2,172	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	5,339	7,791
60-89 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	52,256	12,743
60-89 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,213	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	38,395	5,254
60-89 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	0	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	740	367
60-89 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	2,088	1,854
60-89 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,029	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	3,791	2,347
Past Due 90 Days or More | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	89,660	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	35,974	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	39,891	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	1,361	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	2,489	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	1,298	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	1,460	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	7,187	6,659
Current | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	36,204,787	32,858,462
Current | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,129,486	9,257,145
Current | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	16,082,177	13,926,576
Current | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	397,904	399,343
Current | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,748,850	6,671,469
Current | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,085,146	1,040,761
Current | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	414,540	514,494
Current | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	$ 1,346,684	$ 1,048,674

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