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Schedule of Derivative Activity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Interest Rate Swap [Member]
Derivative [Line Items]
Financial derivative average monthly notional	$ 545,110	$ 525,037
TBA securities [Member]
Derivative [Line Items]
Financial derivative average monthly notional	430,152	606,665
Interest Rate Swaption [Member]
Derivative [Line Items]
Financial derivative average monthly notional	0	5,223
Futures [Member]
Derivative [Line Items]
Financial derivative average monthly notional	$ 20,250	$ 5,308

X

- Definition

Average notional for the period using absolute value of month end notional amounts.

+ References

No definition available.

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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X

- Details

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- Details

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