Fair Value Measurements (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Assets
Fair Value at March 31, 2013	$ 11
Amount Due Upon Maturity	1,130
Difference	1,119
Loan securities carried at fair value [Member]
Assets
Fair Value at March 31, 2013	11
Amount Due Upon Maturity	1,130
Difference	$ 1,119