Allowance for Loan Losses and Credit Quality of Loans, Troubled Debt Restructurings (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Financing Receivable, Modifications [Line Items]
Period of sustained repayment performance for nonperforming TDRs to be returned to performing status (in months)			6 months
Residential Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			1	1
Pre-modification outstanding recorded investment			$ 100,000	$ 200,000
Commercial Real Estate [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts	1
Pre-modification outstanding recorded investment	900,000
Commercial Real Estate [Member] | Residential Real Estate Mortgages [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts			1
Pre-modification outstanding recorded investment			900,000
Home Equity [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts	10		14
Pre-modification outstanding recorded investment	500,000		600,000
Home Equity [Member] | Subsequent Default [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts	3	1	3	1
Pre-modification outstanding recorded investment	200,000	25,000	200,000	25,000
Commercial Loans [Member] | Commercial Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts		1		1
Pre-modification outstanding recorded investment		1,000,000		1,000,000
Residential Real Estate Mortgages [Member] | Residential Real Estate Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts	1
Pre-modification outstanding recorded investment	100,000
Residential Real Estate Mortgages [Member] | Subsequent Default [Member]
Financing Receivable, Modifications [Line Items]
Number of contracts		3
Pre-modification outstanding recorded investment		$ 400,000