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Investment Securities Available For Sale - Unrealized Losses in OCI (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Other-than-temporary impairment loss	$ 0	$ 0	$ 0
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Carrying Value	573,470,000	511,313,000
Less than 12 Months, Gross Unrealized Losses	(9,864,000)	(1,807,000)
Greater than 12 Months, Carrying Value	726,186,000	343,156,000
Greater than 12 Months, Gross Unrealized Losses	(30,262,000)	(13,408,000)
Total Carrying Value	1,299,656,000	854,469,000
Total Gross Unrealized Losses	(40,126,000)	(15,215,000)
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Carrying Value	310,783,000	511,313,000
Less than 12 Months, Gross Unrealized Losses	(8,037,000)	(1,807,000)
Greater than 12 Months, Carrying Value	726,028,000	342,963,000
Greater than 12 Months, Gross Unrealized Losses	(30,247,000)	(13,390,000)
Total Carrying Value	1,036,811,000	854,276,000
Total Gross Unrealized Losses	(38,284,000)	(15,197,000)
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Carrying Value	187,395,000	0
Less than 12 Months, Gross Unrealized Losses	(1,451,000)	0
Greater than 12 Months, Carrying Value	158,000	193,000
Greater than 12 Months, Gross Unrealized Losses	(15,000)	(18,000)
Total Carrying Value	187,553,000	193,000
Total Gross Unrealized Losses	(1,466,000)	$ (18,000)
CMBS
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Carrying Value	75,292,000
Less than 12 Months, Gross Unrealized Losses	(376,000)
Greater than 12 Months, Carrying Value	0
Greater than 12 Months, Gross Unrealized Losses	0
Total Carrying Value	75,292,000
Total Gross Unrealized Losses	$ (376,000)

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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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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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