Acquisition Activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Greensburg Bancshares, Inc [Member]	Jul. 01, 2011 Greensburg Bancshares, Inc [Member]
Business Acquisition [Line Items]
Name of entity which merged		Greensburg Bancshares, Inc. ("Greensburg") and its wholly owned subsidiary Bank of Greensburg, located in Greensburg, LA.
Date of merger agreement				Jul. 01, 2011
Purchase of outstanding stock (in hundredths)					100.00%
Company's stock issued (in shares)				179,036
Company's stock Market value (in dollars per share)				$ 16.93
Company stock					$ 3,000,000
Cash for Greensburg					2,300,000
Acquired assets and liabilities at fair value [Abstract]
Cash and cash equivalents				7,270,000
Investment securities				11,109,000
Loans				63,001,000
Premises and equipment				2,934,000
Core deposit intangible				1,353,000
Other real estate owned				2,309,000
Other assets				1,410,000
Interest-bearing deposits				(61,880,000)
Noninterest-bearing deposits				(16,148,000)
Long-term debt				(3,500,000)
Deferred tax liability				(253,000)
Other liabilities				(632,000)
Gain on Acquisition (Bargain Purchase Gain)	0	(1,665,000)	0	(1,665,000)
Total Purchase Price				$ 5,308,000