Securities (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 Mortgage Backed Securities And Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]	Mar. 31, 2013 Private collateralized mortgage obligations [Member]	Dec. 31, 2012 Private collateralized mortgage obligations [Member]	Mar. 31, 2013 Carrying Amount [Member]	Mar. 31, 2013 Carrying Amount [Member] Collateralized mortgage obligations of U.S. Government Sponsored Entities [Member]	Mar. 31, 2013 Carrying Amount [Member] Private collateralized mortgage obligations [Member]	Mar. 31, 2013 Fair Value [Member] Collateralized mortgage obligations of U.S. Government Sponsored Entities [Member]	Mar. 31, 2013 Fair Value [Member] Private collateralized mortgage obligations [Member]
Securities (Textual) [Abstract]
Securities							$ 92,959,000	$ 165,665,000	$ 92,959,000	$ 165,665,000
Aggregate Losses			(2,100,000)	(539,000)	(530,000)
Fair Value, Total			253,300,000	36,416,000	39,190,000
Net carrying amount of securities transferred						13,818,000
Securities (Additional Textual) [Abstract]
Proceeds from sale of securities	11,836,000	111,717,000
Gains from sale of securities	101,000	3,374,000
Gross losses	76,000	0
Federal Home Loan Bank and Federal Reserve Bank stock	11,200,000
Fair value of cost method investment securities	11,200,000
Collateral Underlying Mortgage Investments Terms	30- and 15-year fixed and adjustable rate mortgages
Net unrealized gain of securities	724,000
Increase in securities available for sale	$ 14,542,000