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Securities - Additional Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Aug. 31, 2014	Jun. 30, 2014	May 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Realized gain (loss) on sale of securities	$ (37,575,000)	$ (4,076,000)	$ 0	$ (1,042,000)	$ 4,059,000	$ (225,000)	$ 0	$ 0	$ (42,693,000)	$ 3,834,000	$ (443,000)
Commercial Mortgage Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Realized gain (loss) on sale of securities									$ (42,693,000)	$ 1,470,000
Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member] | First Mortgage [Member]
Schedule of Available-for-sale Securities [Line Items]
Original face amount														$ 155,000,000
Senior Participation [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member]
Schedule of Available-for-sale Securities [Line Items]
Participations sold												$ 90,000,000	$ 90,000,000
Junior Participation [Member] | Subordinate Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Aruba [Member]
Schedule of Available-for-sale Securities [Line Items]
Participations sold												$ 65,000,000	$ 65,000,000

X

- Definition

This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

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X

- Definition

Amount of the contractual principal due at the origination of the mortgage loan (face amount).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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X

- Definition

The aggregate amount of the participating mortgage obligation at the end of the accounting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=29639217&loc=d3e10013-112621

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- 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.

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