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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
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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