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Investment in Securities (Details Textual) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Proceeds from sales of securities available-for-sale $ 3,485,000 $ 0 $ 33,234,000 $ 5,405,000
Gains on sales of securities 267,000 0 2,401,000 48,000
Available-For-Sale Securities Pledged As Collateral $ 3,250,000   $ 3,250,000