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Debt Obligations, Credit Facilities and Repurchase Agreements (Details) - USD ($) $ in Thousands	1 Months Ended							3 Months Ended	7 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Aug. 31, 2018	Jun. 30, 2018	Apr. 30, 2018	Mar. 31, 2018	Feb. 28, 2018	Jan. 31, 2018	Mar. 31, 2018	Jul. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Jan. 31, 2019
Debt Obligations
Debt Carrying Value	$ 1,169,586									$ 1,169,586	$ 528,573
Collateral Carrying Value	$ 1,315,119									$ 1,315,119	$ 533,584
Weighted Average Note Rate (as a percent)	4.10%									4.10%	3.34%
$17.4 million credit facility
Debt Obligations
Debt Carrying Value	$ 12,405									$ 12,405
Collateral Carrying Value	$ 15,844									$ 15,844
Weighted Average Note Rate (as a percent)	4.73%									4.73%
Variable rate, spread (as a percent)										2.40%
$8 million credit facility
Debt Obligations
Debt Carrying Value	$ 7,941									$ 7,941
Collateral Carrying Value	$ 10,000									$ 10,000
Weighted Average Note Rate (as a percent)	4.83%									4.83%
Variable rate, spread (as a percent)										2.50%
Structured Business
Debt Obligations
Debt Carrying Value	$ 676,983									$ 676,983	$ 237,037
Collateral Carrying Value	$ 822,320									$ 822,320	$ 241,868
Weighted Average Note Rate (as a percent)	4.53%									4.53%	4.02%
Weighted average note rate including certain fees and costs (as a percent)	4.86%									4.86%	4.51%
Unamortized deferred finance costs	$ 2,600									$ 2,600	$ 2,200
Leverage on loans and investment portfolio, excluding the $3.0 million and $2.2 million master security agreement used to finance leasehold and capital expenditure improvements to corporate office (as a percent)	70.00%									70.00%	72.00%
Maximum borrowing capacity	$ 2,200									$ 2,200
Fixed interest rate (as a percent)	4.60%									4.60%
Structured Business | $375 million repurchase facility
Debt Obligations
Debt Carrying Value	$ 334,582									$ 334,582	$ 102,350
Collateral Carrying Value	$ 470,650									$ 470,650	$ 145,850
Weighted Average Note Rate (as a percent)	4.53%									4.53%	3.90%
Maximum borrowing capacity	$ 375,000		$ 375,000							$ 375,000	$ 375,000
Additional borrowing capacity			75,000
Structured Business | $375 million repurchase facility | Minimum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										1.75%
Structured Business | $375 million repurchase facility | Maximum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										3.50%
Structured Business | $100 million repurchase facility
Debt Obligations
Debt Carrying Value	94,024									$ 94,024	2,445
Collateral Carrying Value	$ 132,107									$ 132,107	$ 6,600
Weighted Average Note Rate (as a percent)	4.09%									4.09%	3.61%
Variable rate, spread (as a percent)										2.00%
Maximum borrowing capacity	$ 100,000									$ 100,000	$ 100,000
Structured Business | $100 million repurchase facility | LIBOR
Debt Obligations
Variable rate, spread (as a percent)								2.00%		1.75%
Structured Business | $100 million repurchase facility | Minimum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)				1.75%
Structured Business | $100 million repurchase facility | Maximum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)				2.00%
Structured Business | $75 million credit facility - One
Debt Obligations
Debt Carrying Value	20,355									$ 20,355
Collateral Carrying Value	$ 30,469									$ 30,469
Weighted Average Note Rate (as a percent)	4.07%									4.07%
Maximum borrowing capacity	$ 75,000									$ 75,000	75,000
Structured Business | $75 million credit facility - One | Minimum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)				1.75%				2.00%		1.75%
Structured Business | $75 million credit facility - One | Maximum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)				2.50%				2.50%		2.50%
Structured Business | $75 million credit facility - two
Debt Obligations
Debt Carrying Value	14,482									$ 14,482	8,999
Collateral Carrying Value	$ 21,000									$ 21,000	$ 16,000
Weighted Average Note Rate (as a percent)	4.32%									4.32%	3.61%
Maximum borrowing capacity	$ 75,000									$ 75,000	$ 75,000
Structured Business | $75 million credit facility - two | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										2.00%
Structured Business | $50 million credit facility - one
Debt Obligations
Debt Carrying Value	28,557									$ 28,557	32,538
Collateral Carrying Value	$ 35,700									$ 35,700	$ 40,700
Weighted Average Note Rate (as a percent)	4.32%									4.32%	3.61%
Maximum borrowing capacity	$ 50,000									$ 50,000	$ 50,000
Structured Business | $50 million credit facility - one | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										2.00%
Structured Business | $50 million credit facility - two
Debt Obligations
Debt Carrying Value											3,581
Collateral Carrying Value											$ 4,625
Weighted Average Note Rate (as a percent)											4.88%
Maximum borrowing capacity	50,000									$ 50,000	$ 50,000
Structured Business | $50 million credit facility - two | Minimum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										2.50%
Structured Business | $50 million credit facility - two | Maximum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										3.25%
Structured Business | $25.5 million credit facility
Debt Obligations
Debt Carrying Value	15,773									$ 15,773	13,920
Collateral Carrying Value	$ 34,000									$ 34,000	$ 18,753
Weighted Average Note Rate (as a percent)	4.83%									4.83%	4.12%
Maximum borrowing capacity	$ 25,500									$ 25,500
Structured Business | $25.5 million credit facility | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										2.50%
Structured Business | $25 million credit facility
Debt Obligations
Debt Carrying Value											$ 10,000
Weighted Average Note Rate (as a percent)											4.12%
Maximum borrowing capacity	25,000				$ 10,000			$ 10,000		$ 25,000
Additional borrowing capacity			$ 15,000
Structured Business | $25 million credit facility | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										2.25%
Decrease in interest rate (as a percent)			0.25%
Structured Business | $23.2 million credit facility
Debt Obligations
Debt Carrying Value	23,068									$ 23,068
Collateral Carrying Value	$ 30,900									$ 30,900
Weighted Average Note Rate (as a percent)	4.62%									4.62%
Maximum borrowing capacity	$ 23,200					$ 23,200				$ 23,200	$ 23,200
Extension of maturity date (in years)						1 year
Structured Business | $23.2 million credit facility | LIBOR
Debt Obligations
Variable rate, spread (as a percent)						2.30%				2.30%
Structured Business | $20.0 million credit facility
Debt Obligations
Debt Carrying Value	19,904									$ 19,904
Collateral Carrying Value	$ 41,650									$ 41,650
Weighted Average Note Rate (as a percent)	4.83%									4.83%
Variable rate, spread (as a percent)										2.50%
Maximum borrowing capacity	$ 20,000									$ 20,000	20,000
Structured Business | $20.0 million credit facility | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										2.50%
Structured Business | $17.4 million credit facility
Debt Obligations
Maximum borrowing capacity	17,400		$ 17,400							$ 17,400	17,400
Structured Business | $17.4 million credit facility | LIBOR
Debt Obligations
Variable rate, spread (as a percent)			2.40%
Structured Business | $8 million credit facility
Debt Obligations
Maximum borrowing capacity	$ 8,000									8,000	8,000
Structured Business | $8 million credit facility | LIBOR
Debt Obligations
Variable rate, spread (as a percent)	2.50%
Structured Business | $7.5 million credit facility
Debt Obligations
Debt Carrying Value											7,432
Collateral Carrying Value											$ 9,340
Weighted Average Note Rate (as a percent)											4.37%
Maximum borrowing capacity	$ 7,500									$ 7,500	$ 7,500
Structured Business | $7.5 million credit facility | Minimum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										2.75%
Structured Business | Repurchase facility - securities
Debt Obligations
Debt Carrying Value	$ 102,701									$ 102,701	$ 53,938
Weighted Average Note Rate (as a percent)	4.97%									4.97%	4.45%
Structured Business | Repurchase facility - securities | Minimum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										2.35%
Structured Business | Repurchase facility - securities | Maximum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										3.25%
Structured Business | $3 million master security agreement
Debt Obligations
Debt Carrying Value	$ 1,337									$ 1,337	$ 1,834
Weighted Average Note Rate (as a percent)	3.20%									3.20%	3.21%
Maximum borrowing capacity	$ 3,000									$ 3,000	$ 3,000
Structured Business | $3 million master security agreement | Minimum
Debt Obligations
Variable rate, spread (as a percent)										2.96%
Structured Business | $3 million master security agreement | Maximum
Debt Obligations
Variable rate, spread (as a percent)										3.42%
Structured Business | $2.2 million master security agreement
Debt Obligations
Debt Carrying Value	$ 1,854									$ 1,854
Weighted Average Note Rate (as a percent)	4.66%									4.66%
Variable rate, spread (as a percent)										4.60%
Maximum borrowing capacity	$ 2,200									$ 2,200	2,200
Structured Business | $225 million repurchase facility
Debt Obligations
Variable rate, spread (as a percent)					0.50%
Maximum borrowing capacity					$ 300,000			300,000			225,000
Additional borrowing capacity					$ 75,000			$ 75,000
Agency Business
Debt Obligations
Debt Carrying Value	492,603									492,603	291,536
Collateral Carrying Value	$ 492,799									$ 492,799	$ 291,716
Weighted Average Note Rate (as a percent)	3.50%									3.50%	2.78%
Unamortized deferred finance costs	$ 200									$ 200	$ 200
Agency Business | $500 million multifamily ASAP agreement
Debt Obligations
Debt Carrying Value	96,617									96,617	121,880
Collateral Carrying Value	$ 96,617									$ 96,617	$ 121,880
Weighted Average Note Rate (as a percent)	3.31%									3.31%	2.61%
Maximum borrowing capacity	$ 500,000									$ 500,000	$ 500,000
Agency Business | $500 million multifamily ASAP agreement | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										1.05%
Agency Business | $500 million multifamily ASAP agreement | Minimum | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										0.35%	0.35%
Agency Business | $250 million credit facility
Debt Obligations
Debt Carrying Value	102,180									$ 102,180	$ 23,785
Collateral Carrying Value	$ 102,182									$ 102,182	$ 23,785
Weighted Average Note Rate (as a percent)	3.51%									3.51%	2.86%
Variable rate, spread (as a percent)										1.25%
Maximum borrowing capacity	$ 250,000									$ 250,000	$ 250,000	$ 250,000
Agency Business | $200 million repurchase facility
Debt Obligations
Debt Carrying Value	73,573									73,573	24,827
Collateral Carrying Value	$ 73,573									$ 73,573	$ 24,873
Weighted Average Note Rate (as a percent)	3.54%									3.54%	2.91%
Maximum borrowing capacity	$ 200,000	$ 200,000							$ 100,000	$ 200,000	$ 200,000
Additional borrowing capacity		$ 100,000
Agency Business | $200 million repurchase facility | LIBOR
Debt Obligations
Variable rate, spread (as a percent)		1.275%							1.35%	1.275%
Agency Business | $150 million credit facility - one
Debt Obligations
Debt Carrying Value	136,567									$ 136,567	21,802
Collateral Carrying Value	$ 136,644									$ 136,644	$ 21,821
Weighted Average Note Rate (as a percent)	3.56%									3.56%	2.96%
Maximum borrowing capacity	$ 150,000			$ 150,000			$ 150,000			$ 150,000	$ 150,000
Decrease in interest rate (as a percent)				(0.05%)			(0.10%)
Agency Business | $150 million credit facility - one | LIBOR
Debt Obligations
Variable rate, spread (as a percent)				1.30%			1.35%			1.30%
Agency Business | $150 million credit facility - two
Debt Obligations
Debt Carrying Value	83,666									$ 83,666	99,242
Collateral Carrying Value	$ 83,783									$ 83,783	$ 99,357
Weighted Average Note Rate (as a percent)	3.56%									3.56%	2.91%
Maximum borrowing capacity	$ 150,000									$ 150,000	$ 150,000
Agency Business | $150 million credit facility - two | LIBOR
Debt Obligations
Variable rate, spread (as a percent)										1.30%
Agency Business | Letter of credit | Fannie Mae
Debt Obligations
Additional borrowing capacity		$ 2,000
Outstanding letters of credit		$ 44,000
Agency Business | Letter of credit | Freddie Mac
Debt Obligations
Outstanding letters of credit	5,000									$ 5,000
CLOs | Repurchase facility - securities
Debt Obligations
Collateral Carrying Value	114,200									114,200	61,000
B Piece bonds | Repurchase facility - securities
Debt Obligations
Collateral Carrying Value	$ 50,500									$ 50,500	$ 27,800

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: