Fair Value of Financial Instruments Level 3 (Details) - Fair Value, Measurements, Recurring [Member] - Fair Value, Inputs, Level 3 [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	$ 43,957
Unrealized (loss) gain included in OCI	(118)
Principal payments	(5,072)
Accretion	187
Balance at the end of the period	38,954
Non-Agency CMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	42,033
Unrealized (loss) gain included in OCI	(108)
Principal payments	(4,942)
Accretion	187
Balance at the end of the period	37,170
Non-Agency RMBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning of the period	1,924
Unrealized (loss) gain included in OCI	(10)
Principal payments	(130)
Accretion	0
Balance at the end of the period	$ 1,784