Investments in notes or bonds that are collateralized by a specific group of underlying assets owned by the issuer of the notes or bonds which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

+ References+ Details

- Definition

Debt securities issued by a United States government agency such as Government National Mortgage Association (Ginnie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac), and Federal National Mortgage Association (Fannie Mae), which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details

Investment Securities (Details Textual) (USD $)	12 Months Ended
Investment Securities (Details Textual) (USD $)	Dec. 31, 2012 Investment	Dec. 31, 2011 Investment	Dec. 31, 2010 Investment
Investment Securities (Additional Textual) [Abstract]
Investment securities sold	0	0	0
Investment securities carrying value	$ 66,911,000	$ 110,763,000
Mortgage-backed securities	$ 143,633,000
Life of mortgage-backed securities	3 years 1 month 6 days
Obligations of states and political subdivision [Member]
Investment Securities (Textual) [Abstract]
Debt securities	0
Obligations of U.S. government corporations and agencies [Member]
Investment Securities (Textual) [Abstract]
Debt securities	0
Corporate debt securities [Member]
Investment Securities (Textual) [Abstract]
Debt securities	0