Fair Values of Assets and Liabilities (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2011
Fair Value of Assets and Liabilities (Additional Textual) [Abstract]
Corporate security transferred from Level 3 to Level 2	$ 0	$ (11,965,000)	$ (11,965,000)
Fair Value of Assets and Liabilities (Textual) [Abstract]
Interest rate swap transferred into Level 3 from Level 2	500,000
Impaired loans considered to be credit risk of non-collection	100,000
Updated appraisal requirement floor	250,000
Other real estate book cost	19,100,000
Sale of other real estate	6,800,000
Loss on sale of other real estate	300,000
Standby letters of credit	0			12,580,000
Corporate Securities [Member]
Fair Value of Assets and Liabilities (Additional Textual) [Abstract]
Corporate security transferred from Level 3 to Level 2	$ 0	$ (11,965,000)	$ (11,965,000)