Age Analysis of Past Due Financing receivables (Details) $ in Thousands	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	481	518
Financing Receivable, before Allowance for Credit Loss	$ 13,928,675	$ 13,587,286
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	35	60
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	46	123
Number of Loans Total Past Due | loan	562	701
Total loans	$ 13,928,675	$ 13,587,286
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	5,934	37,927
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	6,560	1,677
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	29,426	7,092
Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	41,920	46,696
Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 13,886,755	$ 13,540,590
Commercial and Industrial [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	$ 1,635,103	$ 1,563,279
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	1	2
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	3	2
Number of Loans Total Past Due | loan	7	11
Total loans	$ 1,635,103	$ 1,563,279
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	49	143
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	175	252
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	23,726	24
Commercial and Industrial [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	23,950	419
Commercial and Industrial [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 1,611,153	$ 1,562,860
Commercial Real Estate [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	7	15
Financing Receivable, before Allowance for Credit Loss	$ 7,760,230	$ 7,992,344
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	5	0
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	3	4
Number of Loans Total Past Due | loan	15	19
Total loans	$ 7,760,230	$ 7,992,344
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	2,052	32,845
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	4,971	0
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	2,977	1,339
Commercial Real Estate [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	10,000	34,184
Commercial Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 7,750,230	$ 7,958,160
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	$ 1,154,413	$ 1,165,457
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
Total loans	$ 1,154,413	$ 1,165,457
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	$ 1,154,413	$ 1,165,457
Small Business [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	12	11
Financing Receivable, before Allowance for Credit Loss	$ 219,102	$ 193,189
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	3	6
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	3	4
Number of Loans Total Past Due | loan	18	21
Total loans	$ 219,102	$ 193,189
Small Business [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	111	136
Small Business [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	25	53
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	5	24
Small Business [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	141	213
Small Business [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 218,961	$ 192,976
Residential Real Estate [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	8	12
Financing Receivable, before Allowance for Credit Loss	$ 2,035,524	$ 1,604,686
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	8	5
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	16	76
Number of Loans Total Past Due | loan	32	93
Total loans	$ 2,035,524	$ 1,604,686
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	1,654	2,709
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	1,105	714
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	1,725	3,922
Residential Real Estate [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	4,484	7,345
Residential Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,031,040	$ 1,597,341
Home Equity [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	19	15
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	3	6
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	17	21
Number of Loans Total Past Due | loan	39	42
Total loans	$ 1,088,750	$ 1,039,611
Home Equity [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	1,647	1,375
Home Equity [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	201	381
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	965	1,671
Home Equity [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,813	3,427
Home Equity [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 1,085,937	$ 1,036,184
Consumer Portfolio Segment [Member]
Financing Receivable Impaired [Line Items]
Number Of Financing Receivables Thirty To Fifty Nine Days Past Due | loan	432	458	[1]
Financing Receivable, before Allowance for Credit Loss	$ 35,553	$ 28,720
Number of Financing Receivables Sixty to Eighty Nine Days Past Due | loan	15	41	[1]
Number Of Financing Receivables Equal To Greater Than Ninety Days | loan	4	16	[1]
Number of Loans Total Past Due | loan	451	515	[1]
Total loans	$ 35,553	$ 28,720	[1]
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	421	719	[1]
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	83	277	[1]
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	28	112	[1]
Consumer Portfolio Segment [Member] | Financial Asset, Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	532	1,108	[1]
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due
Financing Receivable Impaired [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 35,021	$ 27,612	[1]

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