Loans And The Allowance For Credit Losses (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012 loan	Sep. 30, 2011	Sep. 30, 2012 loan property	Sep. 30, 2011	Dec. 31, 2011 property
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	$ 1,072,879,000	$ 1,008,076,000	$ 1,072,879,000	$ 1,008,076,000	$ 1,027,626,000
Net deferred loan origination fees			(192,000)		11,000
Overdrawn deposit balances classified as loan balances	334,000		334,000		399,000
Percentage of loans originated in amounts of the appraised value of the property	80.00%		80.00%
Net loan losses, weighted average determination period, years			5 years
Nonaccrual loans	2,552,000		2,552,000		2,177,000
Total impaired loans	2,740,000	3,192,000	2,740,000	3,192,000	2,511,000
Impaired loans with specific reserve allocation	1,600,000		1,600,000		885,000
Impaired loans with no specific reserve allocation	1,140,000		1,140,000		1,630,000
Interest Income Recognized	36,000	3,000	87,000	10,000
Number of real estate properties					3
Average balance of impaired loans	2,900,000	3,701,000	2,590,000	3,657,000
Related allowance	334,000	254,000	334,000	254,000	227,000
Nonaccruing Troubled Debt Restructuring	372,000		372,000		224,000
Troubled debt restructured loans ("TDRs")	560,000		560,000		558,000
Number of loans	9		9
Interest income on restructured loans	4,000	3,000	26,000	7,000
OREO balance	0	340,000	0	340,000	358,000
Amount of interest which was not earned, but which would have been earned had our nonaccrual and restructured loans	38,000	49,000	107,000	157,000
Real Estate Loans – Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	477,321,000	425,620,000	477,321,000	425,620,000
Total impaired loans	2,132,000	2,380,000	2,132,000	2,380,000
Interest Income Recognized	34,000	3,000	81,000	10,000
Average balance of impaired loans	2,280,000	2,689,000	1,999,000	2,403,000
Related allowance	270,000	215,000	270,000	215,000
Number of loans	8	3	8	3
Real Estate Loans – Residential [Member] | First Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	438,642,000		438,642,000		401,331,000
Nonaccrual loans	1,026,000		1,026,000		1,146,000
Nonaccruing Troubled Debt Restructuring	372,000		372,000
Troubled debt restructured loans ("TDRs")					290,000
Real Estate Loans – Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans	327,182,000	310,863,000	327,182,000	310,863,000
Total impaired loans	581,000	588,000	581,000	588,000
Interest Income Recognized	2,000	0	5,000	0
Average balance of impaired loans	581,000	630,000	518,000	633,000
Related allowance	60,000	0	60,000	0
Number of loans	1		1
Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans	7		7
Payment Default [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans	7		7
Payment Default With Foreclusure Proceedings In Process [Member] | Real Estate Loans – Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Troubled debt restructured loans ("TDRs")	70,000		70,000
Non-Accrual [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans	5		5
Restructured With Longer Terms At Market Rates [Member] | Real Estate Loans – Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans		1		1
Restructured With Rate Concessions [Member] | Real Estate Loans – Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans		2		2
Restructured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual loans	$ 2,100,000		$ 2,100,000		$ 1,600,000
Number of loans		1		1
Default [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans	2		2
Properties Sold [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of real estate properties	2		2