Schedule of Location of Derivatives on Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Derivatives Fair Value [Line Items]
Derivative assets	$ 4,365	$ 27,151
Derivative liabilities	418,921	244,591
Interest Rate Swaps and Swaptions \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	1,831	11,050
Forward Purchase Commitments - MBS \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	2,109	16,101
Forward Purchase Commitments - MBS \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	1,736	36
Forward Purchase Commitments - Mortgage Loans \| Derivative Assets
Derivatives Fair Value [Line Items]
Derivative assets	425
Forward Purchase Commitments - Mortgage Loans \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities		2
Interest Rate Swap
Derivatives Fair Value [Line Items]
Derivative assets		6,489
Interest Rate Swap \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	22,964	42,052
Futures Contracts \| Derivative Liabilities
Derivatives Fair Value [Line Items]
Derivative liabilities	$ 394,221	$ 202,501

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