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Fair Value Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	$ 152,718	$ 155,260
Level 1 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities
Level 2 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	152,718	155,260
Level 3 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities
U.S. agency mortgage-backed [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	109,369	116,529
U.S. agency mortgage-backed [Member] \| Level 1 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities
U.S. agency mortgage-backed [Member] \| Level 2 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	109,369	116,529
U.S. agency mortgage-backed [Member] \| Level 3 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities
Non-U.S. agency mortgage-backed [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	13,628	13,679
Non-U.S. agency mortgage-backed [Member] \| Level 1 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities
Non-U.S. agency mortgage-backed [Member] \| Level 2 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	13,628	13,679
Non-U.S. agency mortgage-backed [Member] \| Level 3 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities
Municipal bonds [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	12,193	12,221
Municipal bonds [Member] \| Level 1 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities
Municipal bonds [Member] \| Level 2 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	12,193	12,221
Municipal bonds [Member] \| Level 3 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities
U.S. government agency [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	17,528	12,831
U.S. government agency [Member] \| Level 1 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities
U.S. government agency [Member] \| Level 2 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities	17,528	12,831
U.S. government agency [Member] \| Level 3 [Member]
Summary of assets and liabilities measured on a recurring basis
Available for sale securities

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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