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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)	9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liabilities	$ 467,000		$ 498,000
TBA purchases	23,000	$ 85,000
Restricted cash	34,100,000		56,000,000
Collateral for Hedging Instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Restricted cash	7,900,000		6,100,000
Not Designated as Hedging Instrument | TBA securities
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative liabilities	181,700,000		148,000,000
Proceeds from sale of investment	$ 0		114,400,000
TBA purchases			$ 262,400,000
Derivatives Designated as Hedging Instruments | Interest rate swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Time to transfer gain (loss) from AOCI to earnings	12 months
Estimated transfer of gain (loss) from AOCI to earnings	$ 0

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