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Investment Securities (Details Textual) (USD $)	12 Months Ended
Investment Securities (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Investment Securities (Textual) [Abstract]
Carrying value of Securities pledged to secure public deposits and for other purposes as required by law	$ 368,200,000	$ 338,600,000
Realized other-than-temporary impairment charges to noninterest income on equity portfolio	$ 13,000	$ 16,000
Maximum investment in any single non-federal issuer representing shareholder's equity	10.00%	10.00%

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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