Loans, Allowance for Loan Losses and Credit Quality (Details 3)	Jun. 30, 2012 Score	Dec. 31, 2011 Score
Residential Portfolio Segment [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO Score (re-scored) (1)	729	731
Combined LTV (re-valued) (2)	67.00%	67.00%
Home Equity [Member]
Weighted average FICO scores and the weighted average combined LTV Ratio
FICO Score (re-scored) (1)	763	762
Combined LTV (re-valued) (2)	55.00%	55.00%