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Investment Securities Available For Sale - Portfolio Reset Periods (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	$ 1,512,252	$ 1,413,081
Less than 6 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	335,764	182,128
6 to 24 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	23,964	24,726
More than 24 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	1,152,524	1,206,227
Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	1,037,730	1,169,536
Agency RMBS | Less than 6 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	9,723	26,876
Agency RMBS | 6 to 24 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	11,870	24,726
Agency RMBS | More than 24 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	1,016,137	1,117,934
Non-Agency RMBS
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	214,037	102,125
Non-Agency RMBS | Less than 6 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	152,000	84,461
Non-Agency RMBS | 6 to 24 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	0	0
Non-Agency RMBS | More than 24 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	62,037	17,664
CMBS
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	260,485	141,420
CMBS | Less than 6 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	174,041	70,791
CMBS | 6 to 24 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	12,094	0
CMBS | More than 24 months
Debt Securities, Available-for-sale [Line Items]
Investment securities, available for sale, at fair value	$ 74,350	$ 70,629

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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

+ Details

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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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