Allowance for Credit Losses - Aging of Analysis of Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due
Loans and leases	$ 14,092,012	$ 12,961,999
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	3,234	7,208
30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	46,065	23,090
60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	10,934	6,101
90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	9,698	12,416
Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	66,697	41,607
Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	14,025,315	12,920,392
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,235,897	2,087,099
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	291	740
Commercial and Industrial | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,682	1,195
Commercial and Industrial | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	769	1,195
Commercial and Industrial | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,441	1,318
Commercial and Industrial | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,892	3,708
Commercial and Industrial | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,231,005	2,083,391
Commercial real estate
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,132,309	3,639,623
Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,505	631
Commercial real estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	727
Commercial real estate | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	5,232	631
Commercial real estate | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,127,077	3,638,992
Construction
Financing Receivable, Recorded Investment, Past Due
Loans and leases	844,643	813,969
Construction | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	109	162
Construction | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	109	162
Construction | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	844,534	813,807
Lease financing
Financing Receivable, Recorded Investment, Past Due
Loans and leases	298,090	231,394
Lease financing | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	298,090	231,394
Residential mortgage
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,302,788	4,083,367
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	58	987
Residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,681	3,030
Residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,983	1,002
Residential mortgage | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,572	5,617
Residential mortgage | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	8,236	9,649
Residential mortgage | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,294,552	4,073,718
Home equity Line
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,055,351	876,608
Loans and Leases Past Due 90 Days or More and Still Accruing Interest		3,681
Home equity Line | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	5,161	1,538
Home equity Line | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,381	538
Home equity Line | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,072	3,681
Home equity Line | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	8,614	5,757
Home equity Line | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,046,737	870,851
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,222,934	1,229,939
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	2,885	1,800
Consumer Portfolio Segment [Member] | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	29,927	16,534
Consumer Portfolio Segment [Member] | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	6,801	3,366
Consumer Portfolio Segment [Member] | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,886	1,800
Consumer Portfolio Segment [Member] | Total Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	39,614	21,700
Consumer Portfolio Segment [Member] | Current
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,183,320	1,208,239
Residential Lending: Residential Mortgage
Financing Receivable, Recorded Investment, Past Due
Loans and leases	$ 4,302,788	4,083,367
Home equity line
Financing Receivable, Recorded Investment, Past Due
Loans and leases		876,608
Home equity line | Residential mortgage
Financing Receivable, Recorded Investment, Past Due
Loans and leases		$ 4,959,975