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Investment Securities (Details Textual) (USD $)	6 Months Ended
Investment Securities (Details Textual) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010
Investment Securities (Textual) [Abstract]
Fair value of Securities pledged to secure public deposits and for other purposes as required by law	$ 310,400,000		$ 338,500,000
Accumulated other comprehensive income related to securities, net of taxes included in shareholders' equity	7,465,000	4,628,000	7,306,000	884,000
Realized other-than-temporary impairment charges to noninterest income on equity portfolio	$ 9,000	$ 10,000
Maximum investment in any single non-federal issuer representing shareholder's equity	10.00%		10.00%

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

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- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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