Loans and Allowance for Credit Losses - Schedule of Past Due Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 32,991,927	$ 31,123,641
Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	32,991,927	31,123,641
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,512,230	9,508,904
Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,279,466	9,298,624
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	14,140,629	12,457,070
Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	13,971,571	12,298,748
BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	401,822	368,602
Residential real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,699,443	6,460,441
Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,699,443	6,460,441
Indirect
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,050,982	1,034,257
Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,050,982	1,034,257
Direct
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	523,172	629,186
Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	523,172	629,186
Home equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,065,471	1,033,783
Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,065,471	1,033,783
Total Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	133,465	186,223
Total Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	22,321	30,028
Total Past Due | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	44,995	81,444
Total Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	2,479	1,698
Total Past Due | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	27,974	40,967
Total Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	10,221	9,378
Total Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	8,678	9,450
Total Past Due | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	16,797	13,258
30-59 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	59,187	104,589
30-59 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	16,128	14,147
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	9,081	47,240
30-59 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,368	730
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	12,358	24,181
30-59 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	7,025	6,302
30-59 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	5,436	5,404
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	7,791	6,585
60-89 Days Past Due | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	12,743	17,713
60-89 Days Past Due | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,332	4,801
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	5,254	1,312
60-89 Days Past Due | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	134	365
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	367	5,033
60-89 Days Past Due | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,854	2,118
60-89 Days Past Due | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,455	2,118
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	2,347	1,966
Past Due 90 Days or More | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	61,535	63,921
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	4,861	11,080
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	30,660	32,892
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	977	603
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	15,249	11,753
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	1,342	958
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	1,787	1,928
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	6,659	4,707
Current | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	32,858,462	30,937,418
Current | Commercial | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	9,257,145	9,268,596
Current | Commercial real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	13,926,576	12,217,304
Current | BBCC | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	399,343	366,904
Current | Residential real estate | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	6,671,469	6,419,474
Current | Indirect | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	1,040,761	1,024,879
Current | Direct | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	514,494	619,736
Current | Home equity | Portfolio Segment After Reclassifications
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans, net of unearned income	$ 1,048,674	$ 1,020,525