Loans, Allowance for Credit Losses and Credit Quality - FICO and LTV (Details) - score		Mar. 31, 2023	Dec. 31, 2022
Residential Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	752	753
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2]	58.70%	57.00%
Home Equity Portfolio
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	771	771
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2],[3]	43.80%	41.30%

[1] The average FICO scores at March 31, 2023 are based upon rescores from March 2023, as available for previously originated loans, or origination score data for loans booked in March 2023.  The average FICO scores at December 31, 2022 were based upon rescores available from December 2022, as available for previously originated loans, or origination score data for loans booked in December 2022.

[2] The combined LTV ratios for March 31, 2023 are based upon updated automated valuations as of February 2023, when available, and/or the most current valuation data available.  The combined LTV ratios for December 31, 2022 were based upon updated automated valuations as of November 2022, when available, and/or the most current valuation data available as of such date.  The updated automated valuations provide new information on loans that may be available since the previous valuation was obtained.  If no new information is available, the valuation will default to the previously obtained data or most recent appraisal.

[3] For home equity loans and lines in a subordinate lien, the LTV data represents a combined LTV, taking into account the senior lien data for loans and lines.