Derivative Financial Instruments (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Derivative [Line Items]
Interest rate swaps designated as cash flow hedges, notional amount	$ 10,000,000	$ 10,000,000
Fair values of effective portion of hedges reflected in Other Comprehensive Income	(793,000)	(1,060,000)
Interest rate derivative assets, fair value	516,000
Interest rate derivative liabilities, fair value	502,000
Interest Rate Swaps [Member]
Derivative [Line Items]
Interest rate derivatives, notional amount	36,460,000
Interest rate derivatives, fair value hedge, notional amount	$ 8,800,000