Loans, Past Due And Accruing Restructured (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Financing receivables, non-accruals, past-due, and accruing restructured loans [Line Items]
Total non-accrual loans	$ 3,248,000		$ 3,248,000		$ 3,668,000
Past-due 90 days or more and still accruing	73,000		73,000		39,000
Total non-accrual and past-due 90 days or more and still accruing	3,321,000		3,321,000		3,707,000
Accruing restructured Loans	13,447,000		13,447,000		14,739,000
Total	16,768,000		16,768,000		18,446,000
Percentage of total non accrual past due 90 days or more still accruing Versus to total loans			0.72%		0.80%
Percentage of total non-accrual, past-due 90 days or more and still accruing, and accruing restructured loans to total loans			3.63%		4.00%
Loans sold to Federal Home Loan Mortgage Corporation Loans serviced for other investors unpaid balance	68,938,000		68,938,000		67,410,000
Total loans sold to Federal Home Loan Mortgage Corporation	5,528,000	976,000	11,394,000	2,698,000
Commercial and Industrial [Member]
Financing receivables, non-accruals, past-due, and accruing restructured loans [Line Items]
Total non-accrual loans	243,000		243,000		495,000
Commercial Secured By Real Estate [Member]
Financing receivables, non-accruals, past-due, and accruing restructured loans [Line Items]
Total non-accrual loans	1,007,000		1,007,000		1,950,000
Residential Real Estate [Member]
Financing receivables, non-accruals, past-due, and accruing restructured loans [Line Items]
Total non-accrual loans	$ 1,998,000		$ 1,998,000		$ 1,223,000