Allowance for Credit Losses - Aging of Analysis of Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due
Loans and leases	$ 13,262,781	$ 12,961,999
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	5,765	7,208
30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	47,858	23,090
60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	6,815	6,101
90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	10,265	12,416
Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	64,938	41,607
Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	13,197,843	12,920,392
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,942,132	2,087,099
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	2,230	740
Commercial and Industrial | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,848	1,195
Commercial and Industrial | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	630	1,195
Commercial and Industrial | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,798	1,318
Commercial and Industrial | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	8,276	3,708
Commercial and Industrial | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,933,856	2,083,391
Commercial real estate
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,956,828	3,639,623
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	176
Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	5,101	631
Commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	903
Commercial real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	6,004	631
Commercial real estate | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,950,824	3,638,992
Construction
Financing Receivable, Recorded Investment, Past Due
Loans and leases	727,771	813,969
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	352
Construction | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	93	162
Construction | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	352
Construction | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	445	162
Construction | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	727,326	813,807
Lease financing
Financing Receivable, Recorded Investment, Past Due
Loans and leases	244,662	231,394
Lease financing | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	244,662	231,394
Residential. Mortgage
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,212,768	4,083,367
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	750	987
Residential. Mortgage | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,445	3,030
Residential. Mortgage | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,090	1,002
Residential. Mortgage | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,955	5,617
Residential. Mortgage | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	10,490	9,649
Residential. Mortgage | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,202,278	4,073,718
Home equity Line
Financing Receivable, Recorded Investment, Past Due
Loans and leases	971,569	876,608
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	1,039	3,681
Home equity Line | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	8,627	1,538
Home equity Line | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	551	538
Home equity Line | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,039	3,681
Home equity Line | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	10,217	5,757
Home equity Line | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	961,352	870,851
Consumer
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,207,051	1,229,939
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	1,218	1,800
Consumer | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	24,744	16,534
Consumer | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,544	3,366
Consumer | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,218	1,800
Consumer | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	29,506	21,700
Consumer | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,177,545	1,208,239
Residential mortgage
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,212,768	4,083,367
Home equity line
Financing Receivable, Recorded Investment, Past Due
Loans and leases	$ 971,569	$ 876,608