CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, liquidation preference	$ 12,000	$ 12,000
Preferred stock, dividend rate (in hundredths)	5.00%	5.00%
Preferred stock, shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, shares issued (in shares)	12,000	12,000
Preferred stock, shares outstanding (in shares)	12,000	12,000
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares issued (in shares)	8,021,633	7,962,693
Common stock, shares outstanding (in shares)	8,021,633	7,962,693