Fair Values of Financial Instruments (Details Textual) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Fair Values of Financial Instruments (Textual) [Abstract]
Recognized Impairment	$ 169,000
Securities available for sale/Available-for-sale, Fair value	155,905,000	112,982,000
Fair Values of Financial Instruments (Additional Textual) [Abstract]
Variable interest entities		800,000
Fair Value, Measurements, Nonrecurring [Member] \| Level 2 Inputs [Member]
Fair Values of Financial Instruments (Textual) [Abstract]
Securities available for sale/Available-for-sale, Fair value	$ 518,526,000

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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