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Allowance for Credit Losses - Past-Due Status (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Recorded Investment, Past Due
Loans and leases	$ 14,129,383	$ 14,408,258
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	5,889	6,019
30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	32,619	45,124
60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	12,022	14,138
90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	19,326	18,355
Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	63,967	77,617
Not Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	14,065,416	14,330,641
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,027,504	2,247,428
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	633	1,432
Commercial and Industrial | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,080	1,481
Commercial and Industrial | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	734	563
Commercial and Industrial | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	633	1,595
Commercial and Industrial | Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,447	3,639
Commercial and Industrial | Not Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,025,057	2,243,789
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,513,706	4,463,992
Commercial Real Estate | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,672
Commercial Real Estate | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	436	153
Commercial Real Estate | Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,108	153
Commercial Real Estate | Not Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,511,598	4,463,839
Construction
Financing Receivable, Recorded Investment, Past Due
Loans and leases	881,462	918,326
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	2,063	536
Construction | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases		434
Construction | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	485	1,179
Construction | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	2,967	536
Construction | Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,452	2,149
Construction | Not Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	878,010	916,177
Lease financing
Financing Receivable, Recorded Investment, Past Due
Loans and leases	444,280	434,650
Lease financing | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	169
Lease financing | Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	169
Lease financing | Not Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	444,111	434,650
Residential mortgage
Financing Receivable, Recorded Investment, Past Due
Loans and leases	5,248,768
Consumer
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,013,663	1,023,969
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	2,566	2,734
Consumer | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	11,539	17,591
Consumer | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,113	3,946
Consumer | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,166	2,734
Consumer | Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	17,818	24,271
Consumer | Not Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	995,845	999,698
Real estate loan
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,077,946	4,168,154
Real estate loan | Residential mortgage
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,077,946	4,168,154
Loans and Leases Past Due 90 Days or More and Still Accruing Interest	627	1,317
Real estate loan | Residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	12,897	19,971
Real estate loan | Residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	6,211	7,478
Real estate loan | Residential mortgage | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	8,443	9,392
Real estate loan | Residential mortgage | Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	27,551	36,841
Real estate loan | Residential mortgage | Not Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	4,050,395	4,131,313
Home Equity Line
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,170,822	1,151,739
Home Equity Line | Home equity Line
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,170,822	1,151,739
Home Equity Line | Home equity Line | 30 - 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	5,431	5,647
Home Equity Line | Home equity Line | 60 - 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	1,479	972
Home Equity Line | Home equity Line | 90 Days or Greater Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	3,512	3,945
Home Equity Line | Home equity Line | Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	10,422	10,564
Home Equity Line | Home equity Line | Not Past Due
Financing Receivable, Recorded Investment, Past Due
Loans and leases	$ 1,160,400	$ 1,141,175

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