Loans (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Percent Of Loan Portfolio Schedule To Mature Over Next Twelve Months	19.00%		19.00%
Percent Of Loan Portfolio Scheduled To Mature After One Year Before Four Years	20.00%		20.00%
Nonaccrual loans	$ 5,922,000	$ 9,631,000	$ 5,922,000	$ 9,631,000	$ 7,361,000
Past due loans greater than 90 days and still accruing	91,000	225,000	91,000	225,000
Nonperforming loans minimum threshold for inidividual impairment evaluation			50,000
Recorded investment in loans considered to be impaired	14,196,000	12,689,000	14,196,000	12,689,000	9,452,000
Loans classified as troubled debt restructurings	12,129,000	3,700,000	12,129,000	3,700,000	4,500,000
Charge offs on troubled debt restructurings	127,000	246,000	784,000	719,000
Proceeds from the sale of loans held for sale			91,769,000	5,558,000
Purchases of loans held for sale			86,576,000
Six troubled debt restructurings [Member]
Troubled debt restructurings, Total recorded investment	3,500,000		3,500,000
Troubled debt restructurings, Total recorded investment impairment amount	815,000		815,000
Two charge offs [Member]
Charge offs on troubled debt restructurings			$ 280,000