Loans, Allowance for Credit Losses and Credit Quality - FICO and LTV (Details) - score		Sep. 30, 2025	Dec. 31, 2024
Residential Portfolio Segment [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	754	755
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2]	56.80%	57.90%
Home Equity Portfolio
Financing Receivable, Credit Quality Indicator [Line Items]
Financing Receivable With Quality Of Loan Based On Weighted Average Fico Rating	[1]	768	769
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2],[3]	44.30%	43.90%

[1] The average FICO scores at September 30, 2025 are based upon rescores from September 2025, as available for previously originated loans, or the origination score data for loans booked since September 2025. The average FICO scores at December 31, 2024 were based upon rescores from December 2024, as available for previously originated loans, or origination score data for loans booked in December 2024.

[2] The combined LTV ratios for September 30, 2025 are based upon updated automated valuations as of August 2025, when available, and/or the most current valuation data available.  The combined LTV ratios for December 31, 2024 were based upon updated automated valuations as of November 2024, when available, and/or the most current valuation data available.  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.