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Business Combinations - Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 16, 2016
Jan. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Total identifiable assets acquired $ 99,462        
Preferred debt 56,697        
Total liabilities assumed 11,363        
Net identifiable assets acquired 31,402        
Goodwill     $ 25,222 $ 25,222  
Gain on bargain purchase on businesses acquired (65) $ (100) 0 (65) $ 0
Noncontrolling Interest, Increase from Business Combination (3,078)   $ (4,462) $ (3,078)  
Net assets acquired 53,481        
Intercompany transaction eliminated 40,400        
Payables to third parties 16,300        
Goodwill purchase accounting adjustments 20        
RiverBanc, RBMI, and RBDHC          
Business Acquisition [Line Items]          
Cash 4,325        
Investment in unconsolidated entities 52,176        
Preferred equity and mezzanine loan investments 23,638        
Real estate under development 14,922        
Receivables and other assets 911        
Intangible assets 3,490        
Construction loan payable 8,499        
Accrued expenses and other liabilities 2,864        
Fair value of previously held membership interests 20,608        
KRVI          
Business Acquisition [Line Items]          
Noncontrolling Interest, Increase from Business Combination (3,100)        
RiverBanc          
Business Acquisition [Line Items]          
Intangible assets 3,500        
RBMI, RBDHC          
Business Acquisition [Line Items]          
Gain on bargain purchase on businesses acquired $ (100)        
Minimum          
Business Acquisition [Line Items]          
Finite-lived intangible asset, useful life 1 year        
Maximum          
Business Acquisition [Line Items]          
Finite-lived intangible asset, useful life 10 years   10 years