Regulatory Matters (Details Textual) (USD $)	1 Months Ended										3 Months Ended
	Jun. 30, 2013	May 31, 2013	Apr. 30, 2013	Mar. 31, 2013	Feb. 28, 2013	Jan. 31, 2013	Dec. 31, 2012	Nov. 30, 2012	Oct. 31, 2012	May 31, 2010	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Mar. 31, 2010	Dec. 31, 2009
Regulatory Matters (Textual) [Abstract]
Trust preferred securities				$ 32,000,000			$ 32,000,000				$ 32,000,000	$ 32,000,000
Aggregate amount of restricted core elements allowed in Tier 1 capital											25.00%
Trusted preferred securities issued date										before May 19, 2010
Maximum level of consolidated aggregate assets allowing for inclusion of trust preferred securities in Tier Capital under Dodd-Frank Act															$ 15,000,000,000
Cash dividend on common stock			$ 0.11								$ 0.10	$ 0.09	$ 0.00
Dividend declared date			Apr. 11, 2013			Jan. 10, 2013			Oct. 11, 2012
Dividend payable date	Jun. 10, 2013			Mar. 08, 2013			Dec. 10, 2012
Dividend payable date of record		May 10, 2013			Feb. 08, 2013			Nov. 09, 2012
Dividend suspended date														Apr. 01, 2010