Loans (Details 5) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Classes of the loan portfolio summarized by credit quality indicators:
Minimum threshold for performing annual review of commercial relationship	$ 750,000
Total Loans	522,146,000	446,443,000
Pass
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	499,782,000	430,070,000
Special Mention
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	16,928,000	11,549,000
Substandard
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	5,435,000	2,072,000
Doubtful
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	1,000	2,752,000
Commercial
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	352,624,000	299,639,000
Commercial | Pass
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	334,137,000	286,472,000
Commercial | Special Mention
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	13,335,000	8,646,000
Commercial | Substandard
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	5,152,000	1,770,000
Commercial | Doubtful
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans		2,751,000
Residential
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	124,820,000	113,212,000
Residential | Pass
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	121,789,000	110,663,000
Residential | Special Mention
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	2,766,000	2,260,000
Residential | Substandard
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	265,000	289,000
Home Equity
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	25,489,000	16,800,000
Home Equity | Pass
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	25,153,000	16,540,000
Home Equity | Special Mention
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	336,000	260,000
Installment
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	18,604,000	16,174,000
Installment | Pass
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	18,106,000	15,806,000
Installment | Special Mention
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	479,000	354,000
Installment | Substandard
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	18,000	13,000
Installment | Doubtful
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	1,000	1,000
Credit Card
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	609,000	618,000
Credit Card | Pass
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	597,000	589,000
Credit Card | Special Mention
Classes of the loan portfolio summarized by credit quality indicators:
Total Loans	$ 12,000	$ 29,000