Securities (Details Textual) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Available-for-sale Securities Pledged as Collateral	$ 176,800,000		$ 176,800,000		$ 185,000,000
Proceeds From Sale Of Available-For-Sale Securities			40,177,000	0
Available-for-sale Securities, Gross Realized Losses	408,000
Available-for-sale Securities, Gross Realized Gains	1,300,000	0	2,100,000	8,000
Available-for-sale Securities, Amortized Cost Basis, Total		10,400,000		10,400,000
Available-For-Sale Securities	200,586,000	3,900,000	200,586,000	3,900,000	185,361,000
Payments To Acquire Federal Home Loan Bank And Federal Reserve Bank Stock			4,900,000		7,300,000
Other Assets [Member]
Payments for (Proceeds from) Federal Reserve Bank Stock, Total			$ 1,300,000		$ 1,300,000