Securities (Details Textual) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Securities (Textual) [Abstract]
Total Temporarily Impaired Securities Continuous Unrealized Loss Position Unrealized Losses	$ 2,241,000	$ 2,241,000		$ 3,976,000
Securities (Additional Textual) [Abstract]
Proceeds from sale of securities		226,839,000
Gains from sale of securities		6,989,000
Gross losses		0
Maturity of securities available for sale		59,538,000	59,551,000
Sale of Securities		0
Securities with Carrying Value and Fair Value Pledged as Collateral for Repurchase Agreement	162,765,000	162,765,000
Federal Home Loan Bank and Federal Reserve Bank stock	11,900,000	11,900,000
Fair value of cost method investment securities	11,900,000	11,900,000
Collateral Underlying Mortgage Investments Terms	30- and 15-year fixed and 10/1 adjustable rate mortgages
Private collateralized mortgage obligations [Member]
Securities (Textual) [Abstract]
Aggregate Losses	857,000	857,000		3,487,000
Total Temporarily Impaired Securities Continuous Unrealized Loss Position Unrealized Losses	2,200,000	2,200,000
Fair Value, Total	43,985,000	43,985,000		59,897,000
Mortgage-backed securities of U.S Government Sponsored Entities [Member]
Securities (Textual) [Abstract]
Aggregate Losses	343,000	343,000		37,000
Fair Value, Total	45,484,000	45,484,000		18,800,000
Mortgage Backed Securities And Collateralized Mortgage Obligations Of US Government Sponsored Entities [Member]
Securities (Textual) [Abstract]
Aggregate Losses	1,400,000	1,400,000
Fair Value, Total	177,500,000	177,500,000
Available for Sale Securities Pledged as Collateral Carrying Value [Member]
Securities (Textual) [Abstract]
Securities pledged as collateral	75,732,000	75,732,000
Fair Value [Member]
Securities (Textual) [Abstract]
Securities pledged as collateral	$ 75,762,000	$ 75,762,000