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Commercial Mortgage Loan Portfolio (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) ft² a property home key unit	Dec. 31, 2015 USD ($) ft² a property home key unit
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 2,720,344
Carrying amount of loans	2,693,092
Commercial Mortgage Portfolio Segment [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	1,659,115	$ 999,583
Carrying amount of loans	1,641,856	994,301
Unfunded Commitment	114,978	73,364
Commercial Mortgage Portfolio Segment [Member] | Condominium [Member] | Condominium - Bethesda, Maryland [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	51,695
Carrying amount of loans	52,476
Unfunded Commitment	$ 0
Property size, number of units/rooms | unit	50
Commercial Mortgage Portfolio Segment [Member] | Vacation Home Portfolio [Member] | Vacation Home Portfolio - Various [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 88,876	94,147
Carrying amount of loans	88,195	93,277
Unfunded Commitment	$ 0	$ 0
Number of properties | property	229	229
Commercial Mortgage Portfolio Segment [Member] | Vacation Home Portfolio [Member] | Vacation Home Portfolio - Various, United States [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 59,500	$ 50,000
Carrying amount of loans	59,193	49,595
Unfunded Commitment	$ 0	$ 0
Number of properties | property	29	24
Commercial Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - Philadelphia, PA [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 34,000	$ 34,000
Carrying amount of loans	33,987	33,994
Unfunded Commitment	$ 0	$ 0
Property size, number of keys | key	301	301
Commercial Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel, New York, NY, September 2018 [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		$ 98,373
Carrying amount of loans		97,381
Unfunded Commitment	$ 29,549	$ 40,034
Property size, number of keys | key	317	317
Commercial Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel - U.S. Virgin Islands [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 42,000	$ 42,000
Carrying amount of loans	41,795	41,600
Unfunded Commitment	$ 1,500	$ 1,500
Property size, number of keys | key	180	180
Commercial Mortgage Portfolio Segment [Member] | Hotel [Member] | Hotel, New York, NY, August 2018 [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 78,140
Carrying amount of loans	77,297
Unfunded Commitment	$ 26,860
Property size, number of keys | key	612
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - Cincinnati, OH [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 165,000	$ 165,000
Carrying amount of loans	163,987	163,173
Unfunded Commitment	$ 0	$ 0
Property size, area | a	65	65
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 85,770	$ 85,770
Carrying amount of loans	86,142	85,658
Unfunded Commitment	$ 6,730	$ 6,730
Property size, area | ft²	330,000	330,000
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use - New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 45,789
Carrying amount of loans	45,541
Unfunded Commitment	$ 4,211
Property size, area | ft²	91,584
Commercial Mortgage Portfolio Segment [Member] | Mixed Use [Member] | Mixed Use, Chicago, IL [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 129,397
Carrying amount of loans	128,271
Unfunded Commitment	$ 3,603
Property size, area | ft²	737,382
Commercial Mortgage Portfolio Segment [Member] | Multifamily [Member] | Multifamily - Williston, ND [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 49,706	$ 49,691
Carrying amount of loans	39,713	49,665
Unfunded Commitment	$ 0	$ 0
Property size, number of units/rooms | home	366	366
Commercial Mortgage Portfolio Segment [Member] | Multifamily [Member] | Multifamily, Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		$ 34,500
Carrying amount of loans		34,886
Unfunded Commitment		$ 0
Property size, number of units/rooms | unit		63
Commercial Mortgage Portfolio Segment [Member] | Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 45,000	$ 45,000
Carrying amount of loans	45,415	44,925
Unfunded Commitment	$ 0	$ 0
Property size, area | ft²	63,300	63,300
Commercial Mortgage Portfolio Segment [Member] | Retail Redevelopment [Member] | Retail Redevelopment - Miami, FL (2) [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 220,000	$ 33,000
Carrying amount of loans	218,771	32,804
Unfunded Commitment	$ 0	0
Property size, area | ft²	113,000
Commercial Mortgage Portfolio Segment [Member] | Retail [Member] | Retail, Brooklyn, NY, March 2017 [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 23,000	1,653
Carrying amount of loans	23,012	1,636
Unfunded Commitment	$ 0	$ 9,000
Property size, area | ft²	10,500	10,500
Commercial Mortgage Portfolio Segment [Member] | Retail [Member] | Retail - Brooklyn, NY, March 2017 - 2 [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 5,910	$ 5,910
Carrying amount of loans	5,921	5,858
Unfunded Commitment	$ 0	$ 0
Property size, area | ft²	5,500	5,500
Commercial Mortgage Portfolio Segment [Member] | Retail [Member] | Retail, Brooklyn, NY, March 2017-3 [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 7,500
Carrying amount of loans	7,489
Unfunded Commitment	$ 0
Property size, area | ft²	6,500
Commercial Mortgage Portfolio Segment [Member] | Retail [Member] | Retail, New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 60,300
Carrying amount of loans	59,775
Unfunded Commitment	$ 4,700
Property size, area | ft²	84,374
Commercial Mortgage Portfolio Segment [Member] | Office [Member] | Office - Richmond, VA [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 54,000	$ 54,000
Carrying amount of loans	53,849	53,475
Unfunded Commitment	$ 1,000	$ 1,000
Property size, area | ft²	262,000	262,000
Commercial Mortgage Portfolio Segment [Member] | Office [Member] | Office - Boston, Massachusetts [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 28,659
Carrying amount of loans	28,543
Unfunded Commitment	$ 2,341
Property size, area | ft²	114,000
Commercial Mortgage Portfolio Segment [Member] | Office [Member] | Office, New York, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 105,000
Carrying amount of loans	104,005
Unfunded Commitment	$ 0
Property size, area | ft²	419,190
Commercial Mortgage Portfolio Segment [Member] | Condo Conversion [Member] | Condo Conversion - Brooklyn, NY [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 41,016
Carrying amount of loans	40,825
Unfunded Commitment	$ 4,484
Property size, area | ft²	133,550
Commercial Mortgage Portfolio Segment [Member] | Condo Conversion [Member] | Condo Conversion, New York, NY, September 2016 [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		$ 24,114
Carrying amount of loans		24,289
Unfunded Commitment		$ 0
Property size, area | ft²		40,000
Commercial Mortgage Portfolio Segment [Member] | Condo Conversion [Member] | Condo Conversion, New York, NY, June 2016 [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		$ 67,300
Carrying amount of loans		67,038
Unfunded Commitment		$ 0
Property size, area | ft²		86,000
Commercial Mortgage Portfolio Segment [Member] | Data Center [Member] | Data Center - Manassas, VA [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 80,000
Carrying amount of loans	79,634
Unfunded Commitment	$ 0
Property size, area | ft²	460,000
Commercial Mortgage Portfolio Segment [Member] | Mixed Use Pre-development [Member] | Mixed Use Pre-development, Los Angeles, CA [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance	$ 50,000
Carrying amount of loans	49,252
Unfunded Commitment	$ 30,000
Property size, area | ft²	75,000
Commercial Mortgage Portfolio Segment [Member] | Condo Construction [Member] | Condo Construction Potomac, MD [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		$ 65,125
Carrying amount of loans		65,087
Unfunded Commitment		$ 0
Property size, number of units/rooms | unit		50
Commercial Mortgage Portfolio Segment [Member] | Condo Construction [Member] | Condo Construction Bethesda, MD [Member]
Mortgage Loans on Real Estate [Line Items]
Current Principal Balance		$ 50,000
Carrying amount of loans		49,960
Unfunded Commitment		$ 15,100
Property size, number of units/rooms | unit		40

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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