Weighted Average FICO Scores & weighted Average Combined LTV Ratios (Details) - score		Dec. 31, 2017	Dec. 31, 2016
Residential Portfolio Segment [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO score (re-scored)	[1]	745	743
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio		59.20%	63.20%
Home Equity [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO score (re-scored)		766	767
Financing Receivable With Credit Quality Of Loan Based Upon the Weighted Average Loan-To-Value Ratio		50.10%	55.90%

[1] The average FICO scores at December 31, 2017 are based upon rescores available from August 2017 and origination score data for loans booked between September and December 2017. The average FICO scores at December 31, 2016 are based upon rescores available from November 2016 and origination score data for loans booked in December 2016.