Loans and Related Allowance for Credit Losses (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013 security	Sep. 30, 2012	Sep. 30, 2013 loan	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Period for loan to be Nonaccrual			90 days
Reserves or charge-offs related to troubled debt restructuring			$ 0
Total loans	282,782,000	278,347,000	282,782,000	278,347,000	277,500,000
Loans modified resulting in troubled debt restructurings			630,000
Period for average historical loss for each portfolio segments			10 years
Period over which historical loss for portfolio segments has been used			7 years
Business lines of credit, maturity period			5 years
Period for loans to be considered for charge off			120 days
Number of troubled debt restructurings			6
Real Estate - Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	77,282,000	66,259,000	77,282,000	66,259,000	69,187,000
Loans modified resulting in troubled debt restructurings			61,000
Maximum terms offered to loans			20 years
Maximum loan-to-value ratio			80.00%
Number of troubled debt restructurings			1
Home equity lines of credit [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Maximum terms offered to loans			20 years
Maximum loan-to-value ratio			90.00%
Fixed Rate and Adjustable Rate Mortgage Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Maximum terms offered to loans			25 years
Home equity installment loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Maximum terms offered to loans			15 years
Maximum loan-to-value ratio			80.00%
Real Estate - Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	143,218,000	158,336,000	143,218,000	158,336,000	153,122,000
Loans modified resulting in troubled debt restructurings			569,000
Maximum loan-to-value ratio			80.00%
Number of troubled debt restructurings			5
Troubled Debt Restructuring, Current Period [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	61,000		61,000		0
Loans modified resulting in troubled debt restructurings	50,000	0		0
Defaults of trouble debt restructuring	0	0	0	0
Number of troubled debt restructurings	1		1
Troubled Debt Restructuring, Current Period [Member] | Real Estate - Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans modified resulting in troubled debt restructurings	$ 50,000
Number of troubled debt restructurings	1