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Investment Securities Available for Sale - Schedule of Investment Securities Available for Sale in Unrealized Loss Position (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Carrying Value Less Than 12 Months	$ 91,170	$ 112,880
Gross Unrealized Losses Less Than 12 Months	(914)	(1,679)
Carrying Value Greater Than 12 Months	281,364	329,070
Gross Unrealized Losses Greater Than 12 Months	(9,886)	(10,973)
Carrying Value	372,534	441,950
Gross Unrealized Losses	(10,800)	(12,652)
Agency RMBS
Schedule of Available-for-sale Securities [Line Items]
Carrying Value Less Than 12 Months	91,170	96,357
Gross Unrealized Losses Less Than 12 Months	(914)	(1,290)
Carrying Value Greater Than 12 Months	281,152	328,474
Gross Unrealized Losses Greater Than 12 Months	(9,866)	(10,819)
Carrying Value	372,322	424,831
Gross Unrealized Losses	(10,780)	(12,109)
Non-Agency RMBS
Schedule of Available-for-sale Securities [Line Items]
Carrying Value Less Than 12 Months	0	0
Gross Unrealized Losses Less Than 12 Months	0	0
Carrying Value Greater Than 12 Months	212	596
Gross Unrealized Losses Greater Than 12 Months	(20)	(154)
Carrying Value	212	596
Gross Unrealized Losses	$ (20)	(154)
CMBS
Schedule of Available-for-sale Securities [Line Items]
Carrying Value Less Than 12 Months		16,523
Gross Unrealized Losses Less Than 12 Months		(389)
Carrying Value Greater Than 12 Months		0
Gross Unrealized Losses Greater Than 12 Months		0
Carrying Value		16,523
Gross Unrealized Losses		$ (389)

X

- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

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-Publisher FASB
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Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 6
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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-Section 50
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+ References

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