Assets and Liabilities Measured at Fair Value (Details Textual) (USD $)	3 Months Ended	12 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2010 First Investment	Mar. 31, 2013 First Investment	Mar. 31, 2013 Second Investment	Mar. 31, 2013 Level 3 Investment
Fair Value (Textual) [Abstract]
Number of securities					2
Par value of investment			$ 1,000,000	$ 1,000,000
Written down value of investment		50,000
Impairment charges of investment		950,000
Negative mark to fair value				$ 700,000
Fair Value (Additional Textual) [Abstract]
Maximum remaining maturity of financial instruments having no defined maturity	180 days
Percentage of written down in appraisal value of nonaccrual impaired loans	80.00%
Percentage of written down in appraisal value of foreclosed properties	80.00%
Percentage of written down in asking price of foreclosed properties	90.00%