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Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	$ 36,413,944	$ 36,285,887
Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	36,413,944	36,285,887
Commercial
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,650,615	10,288,560
Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,430,466	10,056,259
Commercial real estate
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	16,135,327	16,307,486
Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	15,961,366	16,133,048
BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	394,110	406,739
Residential real estate
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,771,694	6,797,586
Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,771,694	6,797,586
Indirect
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,070,536	1,096,778
Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,070,536	1,096,778
Direct
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	511,455	514,144
Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	511,455	514,144
Home equity
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,274,317	1,281,333
Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,274,317	1,281,333
Total Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	259,114	283,006
Total Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	80,438	65,248
Total Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	86,907	92,113
Total Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	3,655	3,518
Total Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	60,518	88,114
Total Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,395	13,838
Total Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	3,912	4,444
Total Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	13,289	15,731
30-59 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	90,683	92,237
30-59 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	21,038	5,970
30-59 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	22,945	19,240
30-59 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	987	1,227
30-59 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	31,566	49,331
30-59 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	7,307	9,700
30-59 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,264	2,004
30-59 Days Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	5,576	4,765
60-89 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	15,946	44,739
60-89 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	2,945	12,021
60-89 Days Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,977	12,728
60-89 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	707	861
60-89 Days Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,104	12,085
60-89 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,807	2,675
60-89 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,019	970
60-89 Days Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,387	3,399
Past Due 90 Days or More | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	152,485	146,030
Past Due 90 Days or More | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	56,455	47,257
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	61,985	60,145
Past Due 90 Days or More | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,961	1,430
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	22,848	26,698
Past Due 90 Days or More | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,281	1,463
Past Due 90 Days or More | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,629	1,470
Past Due 90 Days or More | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,326	7,567
Current | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	36,154,830	36,002,881
Current | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	10,350,028	9,991,011
Current | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	15,874,459	16,040,935
Current | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	390,455	403,221
Current | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	6,711,176	6,709,472
Current | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	1,060,141	1,082,940
Current | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	507,543	509,700
Current | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Past Due [Line Items]
Total loans, net of unearned income	$ 1,261,028	$ 1,265,602

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