Securities (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Mortgage Backed Securities and Collateralized Mortgage Obligations of US Government Sponsored Entities [Member]	Jun. 30, 2013 Private collateralized mortgage obligations [Member]	Dec. 31, 2012 Private collateralized mortgage obligations [Member]	Jun. 30, 2013 Carrying Amount [Member] Collateralized mortgage obligations of U.S. Government Sponsored Entities [Member]	Jun. 30, 2013 Carrying Amount [Member] Private collateralized mortgage obligations [Member]	Jun. 30, 2013 Fair Value [Member] Collateralized mortgage obligations of U.S. Government Sponsored Entities [Member]	Jun. 30, 2013 Fair Value [Member] Private collateralized mortgage obligations [Member]
Securities (Textual) [Abstract]
Securities						$ 80,403,000	$ 164,241,000	$ 80,403,000	$ 164,241,000
Aggregate Losses			10,900,000	1,073,000	530,000
Fair Value, Total			431,100,000	53,861,000	39,190,000
Securities (Additional Textual) [Abstract]
Proceeds from sale of securities	55,519,000	226,839,000
Gains from sale of securities	496,000	6,989,000
Gross losses	357,000	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