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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	$ 36,150,513	$ 32,991,927
Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	36,150,513	32,991,927
Commercial
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,332,631	9,512,230
Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,102,227	9,279,466
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	16,016,958	14,140,629
Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	15,841,344	13,971,571
BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	406,018	401,822
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,894,957	6,699,443
Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,894,957	6,699,443
Indirect
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,101,585	1,050,982
Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,101,585	1,050,982
Direct
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	429,426	523,172
Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	429,426	523,172
Home equity
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,374,956	1,065,471
Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,374,956	1,065,471
Total Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	172,147	133,465
Total Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	37,372	22,321
Total Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	66,610	44,995
Total Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	3,683	2,479
Total Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	30,427	27,974
Total Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	9,324	10,221
Total Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	9,157	8,678
Total Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	15,574	16,797
30-59 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	52,654	59,187
30-59 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	14,191	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	9,442	9,081
30-59 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	2,155	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	10,558	12,358
30-59 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,550	7,025
30-59 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	4,578	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	5,180	7,791
60-89 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	31,340	12,743
60-89 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,151	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	16,022	5,254
60-89 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	54	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	3,189	367
60-89 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,928	1,854
60-89 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,341	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	2,655	2,347
Past Due 90 Days or More | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	88,153	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	17,030	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	41,146	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	1,474	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	16,680	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	846	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	3,238	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	7,739	6,659
Current | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	35,978,366	32,858,462
Current | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,064,855	9,257,145
Current | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	15,774,734	13,926,576
Current | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	402,335	399,343
Current | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,864,530	6,671,469
Current | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,092,261	1,040,761
Current | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	420,269	514,494
Current | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	$ 1,359,382	$ 1,048,674

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