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Investment Securities Available For Sale - Unrealized Losses in OCI (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Other-than-temporary impairment loss	$ 0	$ 0	$ 0
Schedule of Available-for-sale Securities [Line Items]
Carrying Value Less Than 12 Months	511,313,000	112,880,000
Gross Unrealized Losses Less Than 12 Months	(1,807,000)	(1,679,000)
Carrying Value Greater Than 12 Months	343,156,000	329,070,000
Gross Unrealized Losses Greater Than 12 Months	(13,408,000)	(10,973,000)
Carrying Value Total	854,469,000	441,950,000
Gross Unrealized Losses Total	(15,215,000)	(12,652,000)
Agency RMBS
Schedule of Available-for-sale Securities [Line Items]
Carrying Value Less Than 12 Months	511,313,000	96,357,000
Gross Unrealized Losses Less Than 12 Months	(1,807,000)	(1,290,000)
Carrying Value Greater Than 12 Months	342,963,000	328,474,000
Gross Unrealized Losses Greater Than 12 Months	(13,390,000)	(10,819,000)
Carrying Value Total	854,276,000	424,831,000
Gross Unrealized Losses Total	(15,197,000)	(12,109,000)
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	193,000	596,000
Gross Unrealized Losses Greater Than 12 Months	(18,000)	(154,000)
Carrying Value Total	193,000	596,000
Gross Unrealized Losses Total	$ (18,000)	(154,000)
CMBS
Schedule of Available-for-sale Securities [Line Items]
Carrying Value Less Than 12 Months		16,523,000
Gross Unrealized Losses Less Than 12 Months		(389,000)
Carrying Value Greater Than 12 Months		0
Gross Unrealized Losses Greater Than 12 Months		0
Carrying Value Total		16,523,000
Gross Unrealized Losses Total		$ (389,000)

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

Reference 2: 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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- Definition

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

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

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This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ 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)(1)
-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 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
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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+ 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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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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