Business Combinations - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
	May 16, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 25,222		$ 25,222
Gain on bargain purchase on businesses acquired		0	$ (65)
Non-controlling interest		$ (4,462)
Intercompany transaction eliminated	$ 40,400
Mortgages payable	16,300
RiverBanc, RBMI, and RBDHC
Business Acquisition [Line Items]
Cash	4,325
Investment in unconsolidated entities	52,176
Mezzanine loan and preferred equity investments	23,638
Real estate under development	14,922
Receivables and other assets	911
Intangible assets	3,490
Total identifiable assets acquired	99,462
Construction loan payable	8,499
Accrued expenses and other liabilities	2,864
Total liabilities assumed	11,363
Preferred equity	56,697
Net identifiable assets acquired	31,402
Non-controlling interest	(3,078)
Net assets acquired	53,481
RiverBanc
Business Acquisition [Line Items]
Intangible assets	3,500
Goodwill	25,222
RBMI, RBDHC
Business Acquisition [Line Items]
Gain on bargain purchase on businesses acquired	(65)			$ (100)
KRVI
Business Acquisition [Line Items]
Non-controlling interest	$ (3,100)