Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Assets measured at fair value on a recurring basis	$ 12,238	$ 19,713
Securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis	12,220	19,694
Loan securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis	11	11
Interest rate caps [Member]
Assets
Assets measured at fair value on a recurring basis	7	8
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Assets measured at fair value on a recurring basis	12,220	19,694
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis	12,220	19,694
Significant Other Observable Inputs (Level 2) [Member]
Assets
Assets measured at fair value on a recurring basis	7	8
Significant Other Observable Inputs (Level 2) [Member] | Interest rate caps [Member]
Assets
Assets measured at fair value on a recurring basis	7	8
Significant Unobservable Inputs (Level 3) [Member]
Assets
Assets measured at fair value on a recurring basis	11	11
Significant Unobservable Inputs (Level 3) [Member] | Loan securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis	$ 11	$ 11