Schedule of Location of Derivatives on Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Derivatives Fair Value [Line Items]
Derivative assets	$ 2,914	$ 27,151
Derivative liabilities	325,233	244,591
Interest Rate Swaps and Swaptions \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	2,031	11,050
Interest Rate Swap
Derivatives Fair Value [Line Items]
Derivative assets	1,304	6,489
Interest Rate Swap \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	6,802	42,052
Futures Contracts \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	693
Futures Contracts \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	286,058	202,501
Forward Purchase Commitments - MBS \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	165	16,101
Forward Purchase Commitments - MBS \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	32,373	36
Forward Purchase Commitments - Mortgage Loans \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	$ 25
Forward Purchase Commitments - Mortgage Loans \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities		$ 2

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