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Investment Securities Available For Sale - Portfolio Reset Periods (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	$ 1,413,081	$ 818,976
Less than 6 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	182,128	185,668
6 to 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	24,726	27,272
More than 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	1,206,227	606,036
Agency RMBS
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	1,169,536	526,363
Agency RMBS | Less than 6 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	26,876	53,043
Agency RMBS | 6 to 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	24,726	27,272
Agency RMBS | More than 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	1,117,934	446,048
Non-Agency RMBS
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	102,125	163,284
Non-Agency RMBS | Less than 6 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	84,461	50,080
Non-Agency RMBS | 6 to 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	0	0
Non-Agency RMBS | More than 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	17,664	113,204
U.S. Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	0	2,887
U.S. Treasury securities | Less than 6 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	0	0
U.S. Treasury securities | 6 to 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	0	0
U.S. Treasury securities | More than 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	0	2,887
CMBS
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	141,420	126,442
CMBS | Less than 6 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	70,791	82,545
CMBS | 6 to 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	0	0
CMBS | More than 24 months
Schedule of Available-for-sale Securities [Line Items]
Carrying value, investment securities available for sale	$ 70,629	$ 43,897

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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- Definition

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+ References

No definition available.

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