Preferred Stock (Details Textual) (USD $)	0 Months Ended		12 Months Ended			3 Months Ended
	Dec. 05, 2008	Oct. 14, 2008	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Jul. 18, 2012
Class of Stock [Line Items]
Warrants Issued To Acquire Additional Of Common Share	550,595
Warrants Issued To Acquire Additional Of Common Shares Exercise Price	$ 10.08
Warrants Issued To Acquire Additional Of Common Shares Term	10 years
Common Stock, Dividends, Per Share, Declared		$ 0.26	$ 0.63	$ 0.40	$ 0.20
Additional Preferred Shares						19,440
Stockholders Equity Attributable to Parent			$ 279,505,000	$ 272,147,000	$ 258,128,000		$ 278,127,000
Deferred Offering Costs						181,000
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized			4,963,000	4,963,000
Preferred Stock, Par Or Stated Value Per Share			$ 0.01	$ 0.01
Stockholders Equity Attributable to Parent			0	0	0		36,641,000
Retained Earnings [Member]
Class of Stock [Line Items]
Stockholders Equity Attributable to Parent			200,600,000	182,290,000	164,103,000		148,010,000
Us Treasury [Member]
Class of Stock [Line Items]
Preferred Stock Clearing Price						$ 962.66
Stock Repurchased During Period Shares1						1,100
Stock Repurchased During Period Value One						997.50
Stock Repurchased During Period Shares2						2,500
Stock Repurchased During Period Value Two						1,000
Stock Repurchased During Period Shares3						16,840
Stock Repurchased During Period Value Three						998.75
Stock Repurchased During Period, Shares						16,560
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased								1,000
Stockholders Equity Attributable to Parent						642,000
Us Treasury [Member] | Preferred Stock [Member]
Class of Stock [Line Items]
Stockholders Equity Attributable to Parent						36,400,000
Us Treasury [Member] | Retained Earnings [Member]
Class of Stock [Line Items]
Stockholders Equity Attributable to Parent						37,000,000
Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Shares Authorized	37,000,000		37,000	37,000		37,000
Preferred Stock, Par Or Stated Value Per Share	$ 0.01		$ 0.01	$ 0.01
First Five Years [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	5.00%
After Five Years [Member]
Class of Stock [Line Items]
Preferred Stock, Dividend Rate, Percentage	9.00%
Senior Preferred Shares [Member]
Class of Stock [Line Items]
Stock Repurchased During Period Value Two	$ 1,000