Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Assets
Assets measured at fair value on a recurring basis	$ 42,967	$ 34,250
Securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis	37,191	28,856
Loan securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis	5,756	5,309
Interest rate caps [Member]
Assets
Assets measured at fair value on a recurring basis	20	85
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets
Assets measured at fair value on a recurring basis	37,191	28,856
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	37,191	28,856
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Loan securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest rate caps [Member]
Assets
Assets measured at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member]
Assets
Assets measured at fair value on a recurring basis	20	85
Significant Other Observable Inputs (Level 2) [Member] | Securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member] | Loan securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis
Significant Other Observable Inputs (Level 2) [Member] | Interest rate caps [Member]
Assets
Assets measured at fair value on a recurring basis	20	85
Significant Unobservable Inputs (Level 3) [Member]
Assets
Assets measured at fair value on a recurring basis	5,756	5,309
Significant Unobservable Inputs (Level 3) [Member] | Securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis
Significant Unobservable Inputs (Level 3) [Member] | Loan securities carried at fair value [Member]
Assets
Assets measured at fair value on a recurring basis	5,756	5,309
Significant Unobservable Inputs (Level 3) [Member] | Interest rate caps [Member]
Assets
Assets measured at fair value on a recurring basis