Schedule of Location of Derivatives on Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Derivatives Fair Value [Line Items]
Derivative assets	$ 20,207	$ 2,914
Derivative liabilities	419,282	325,233
Interest Rate Swaps and Swaptions \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	6	2,031
Interest Rate Swap
Derivatives Fair Value [Line Items]
Derivative assets		1,304
Interest Rate Swap \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	11,440	6,802
Futures Contracts
Derivatives Fair Value [Line Items]
Derivative assets		693
Futures Contracts \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets		693
Futures Contracts \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	407,842	286,058
Forward Purchase Commitments - MBS \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	20,150	165
Forward Purchase Commitments - MBS \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities		32,373
Forward Purchase Commitments - Mortgage Loans \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	$ 51	$ 25

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