Age Analysis of Past Due Financing receivables (Details) $ in Thousands		Dec. 31, 2024 USD ($) loan	Dec. 31, 2023 USD ($) loan
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		761	480
Financing Receivable, before Allowance for Credit Loss		$ 14,508,378	$ 14,278,070
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		28	29
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		37	40
Number of Loans Total Past Due | loan		826	549
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 47,521	$ 23,616
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		2,201	29,433
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		37,686	10,305
Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		87,408	63,354
Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 14,420,970	$ 14,214,716
Commercial and Industrial [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		120	7
Financing Receivable, before Allowance for Credit Loss		$ 3,047,671	$ 2,925,823
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		1	1
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		5	2
Number of Loans Total Past Due | loan		126	10
Commercial and Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 5,807	$ 785
Commercial and Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		5	17,538
Commercial and Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		13,843	673
Commercial and Industrial [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		19,655	18,996
Commercial and Industrial [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 3,028,016	$ 2,906,827
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		3	7
Financing Receivable, before Allowance for Credit Loss		$ 6,756,708	$ 6,695,671
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		0	2
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		3	3
Number of Loans Total Past Due | loan		6	12
Commercial Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 33,087	$ 14,287
Commercial Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		0	8,419
Commercial Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		20,458	7,279
Commercial Real Estate [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		53,545	29,985
Commercial Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 6,703,163	$ 6,665,686
Construction Loans [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		0	0
Financing Receivable, before Allowance for Credit Loss		$ 782,078	$ 849,586
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		0	0
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		0	0
Number of Loans Total Past Due | loan		0	0
Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 0	$ 0
Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		0	0
Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		0	0
Construction Loans [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		0	0
Construction Loans [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 782,078	$ 849,586
Small Business [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		6	6
Financing Receivable, before Allowance for Credit Loss		$ 281,781	$ 251,956
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		4	1
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		3	6
Number of Loans Total Past Due | loan		13	13
Small Business [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 830	$ 400
Small Business [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		24	20
Small Business [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		29	243
Small Business [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		883	663
Small Business [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 280,898	$ 251,293
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		27	24
Financing Receivable, before Allowance for Credit Loss		$ 2,460,600	$ 2,424,754
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		9	7
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		10	13
Number of Loans Total Past Due | loan		46	44
Residential Real Estate [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 6,310	$ 6,216
Residential Real Estate [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,401	2,187
Residential Real Estate [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		2,224	1,573
Residential Real Estate [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		9,935	9,976
Residential Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 2,450,665	$ 2,414,778
Home Equity [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan		9	23
Financing Receivable, before Allowance for Credit Loss		$ 1,140,168	$ 1,097,626
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan		11	4
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan		10	10
Number of Loans Total Past Due | loan		30	37
Home Equity [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 1,046	$ 1,640
Home Equity [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		764	1,238
Home Equity [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		1,126	529
Home Equity [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		2,936	3,407
Home Equity [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss		$ 1,137,232	$ 1,094,219
Consumer Portfolio Segment [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	[1]	596	413
Financing Receivable, before Allowance for Credit Loss	[1]	$ 39,372	$ 32,654
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	[1]	3	14
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	[1]	6	6
Number of Loans Total Past Due | loan	[1]	605	433
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	[1]	$ 441	$ 288
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	[1]	7	31
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	[1]	6	8
Consumer Portfolio Segment [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	[1]	454	327
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	[1]	$ 38,918	$ 32,327

[1] Other consumer portfolio is inclusive of deposit account overdrafts recorded as loan balances.