Loans, Allowance for Credit Losses and Credit Quality - FICO and LTV (Details) - score		Jun. 30, 2026	Dec. 31, 2025
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	754
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio	[2]	56.20%	57.20%
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]	45.10%	45.30%

[1] The weighted average FICO scores for June 30, 2026 and December 31, 2025 are based upon rescores from June 2026 and December 2025, respectively. For any borrower where rescores were not available, the most recent FICO score data was used.

[2] The combined LTV ratios for June 30, 2026 and December 31, 2025 are calculated with consideration given to either the value obtained at origination or an updated automated valuation. Newly originated loans with valuations obtained in the previous 12 months will rely on the value obtained at origination. The remainder of the portfolio utilized updated automated valuation as of May 2026 and November 2025 for the purposes of the June 30, 2026 and December 31, 2025 ratios, respectively. If the updated value is not available, the most recent valuation or the original value will be used, depending on valuation age. 

[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.