Regulatory Enforcement Action (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Mar. 31, 2013	Jan. 31, 2013	Jan. 15, 2013	Sep. 30, 2012	Sep. 21, 2012	Jun. 30, 2012	May 31, 2011
Regulatory Enforcement Action (Textual) [Abstract]
Private offering securities issued to accredited investors	$ 2,100,000
Regulatory Enforcement Action (Additional Textual) [Abstract]
Reduction of classified assets percentage within six months								75.00%
Reduction of classified assets amount within six months					219,000,000
Reduction of classified assets percentage within twelve months								50.00%
Reduction of classified assets amount within twelve months		146,100,000				147,300,000
Tier 1 leverage capital ratio	8.70%		8.50%				9.00%
Total risk-based capital ratio			12.00%				12.00%
Capital intended to be raised through private offering and right offering				47,000,000
Common share sale price	$ 2.75
Percentage of outstanding shares of non-affiliated investors	29.00%
Maximum percentage of shares issued under private offering	4.90%
Private offering [Member]
Regulatory Enforcement Action (Textual) [Abstract]
Private offering securities issued to accredited investors	39,900,000
Rights offering [Member]
Regulatory Enforcement Action (Textual) [Abstract]
Private offering securities issued to accredited investors	$ 5,000,000