Notes Payable and Long-Term Debt (Narrative) (Details) (USD $)	0 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 19, 2009	Mar. 19, 2009	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jan. 31, 2012	May 26, 2010	Sep. 30, 2013 Promissory Notes [Member]	Dec. 31, 2012 Promissory Notes [Member]	Jul. 31, 2012 Promissory Notes [Member]	Sep. 30, 2013 Line of Credit [Member]	Dec. 31, 2012 Line of Credit [Member]	Sep. 30, 2013 Secured Debt [Member]	Dec. 31, 2012 Secured Debt [Member]	Sep. 30, 2012 Secured Debt [Member]	Dec. 31, 2009 Interest Rate Swap [Member]	Dec. 31, 2010 Cash Flow Hedging [Member]	Mar. 19, 2009 Trust Preferred Security Offering, 2007 [Member]	May 26, 2010 Trust Preferred Security Offering, 2005 [Member]
Debt Instrument [Line Items]
Derivative, Notional Amount																				$ 3,000,000	$ 9,000,000
Description of variable rate basis	three-month LIBOR
Long-term debt, basis spread on variable rate		3.40%
Interest rate, stated percentage	7.02%	7.02%										1.00%	4.50%
Derivative, fixed interest rate									8.49%
Cash flow hedge, liability at fair value																		319,000	712,000
Cash flow hedge, derivative instrument liabilities at fair value			1,031,000		1,031,000		1,521,000
Unrealized gain on interest rate swap			30,000	80,000	(324,000)	239,000	214,000
Available-for-sale securities pledged as collateral			1,474,000		1,474,000		1,557,000
Line of credit facility, maximum borrowing capacity								700,000				13,000,000					4,000,000
Line of credit facility, interest rate								5.00%
Drawns on line of credit			0		0		125,000
Long-term debt, interest rate at period end										4.25%	4.25%			4.50%
Line of credit facility, current borrowing capacity															500,000
Amount outstanding										10,500,000	10,500,000				0	3,634,000
Annual installments			$ 1,167,000		$ 1,167,000