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Summary of Significant Accounting Policies (Details)
 1 Months Ended 12 Months Ended
Mar. 31, 2017
variable_interest_entity
May 16, 2016
May 31, 2015
Dec. 31, 2018
USD ($)
segment
securitization
Dec. 31, 2017
USD ($)
securitization
Oct. 01, 2017
USD ($)
Jan. 23, 2017
Dec. 31, 2006
securitization
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Residential mortgage loans, delinquency period       90 days        
Inventory, real estate, construction in process       $ 24,800,000        
Goodwill       25,222,000 $ 25,222,000      
Goodwill accumulated impairment           $ 0    
Restricted cash and cash equivalents       5,400,000 11,000,000      
Interest receivable       41,900,000 33,600,000      
Deferred finance costs       200,000 700,000      
Employer contributions to employee benefit plan       $ 0 0      
Number of reportable segments | segment       1        
Estimated increase in assets from adoption of new accounting guidance, pecentage       1.00%        
Estimated increase in liabilities from adoption of new accounting guidance, percentage       1.00%        
Performance Shares                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Award vesting period     3 years          
6.25% senior convertible notes due 2022 | Convertible Notes                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Interest rate (as a percent)             6.25%  
Discount at issuance (percent)             4.00%  
Discount and debt issuance costs, net       $ 7,200,000 9,300,000      
Financing arrangements, residential mortgage loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Deferred finance costs       $ 1,200,000 $ 700,000      
Consolidated K-Series | K-Series                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Number of securitizations | securitization       9 7     4
RBDHC | VIE, Primary Beneficiary                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Impairment of real estate under development       $ 2,800,000        
RBDHC | VIE, Primary Beneficiary | Net Income (Loss) Attributable to Noncontrolling Interest                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Impairment of real estate under development       1,400,000        
RBDHC | VIE, Primary Beneficiary | Net Loss Attributable to Parent                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Impairment of real estate under development       1,400,000        
Receivables And Other Assets                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Inventory, real estate, construction in process       $ 22,000,000 $ 22,900,000      
Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finite-lived intangible asset, useful life   1 year   6 months        
Repurchase agreements, expiration period       12 months        
Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finite-lived intangible asset, useful life   10 years   10 years        
Repurchase agreements, expiration period       18 months        
Building                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Property, plant and equipment useful life       30 years        
Building Improvements | Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Property, plant and equipment useful life       10 years        
Building Improvements | Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Property, plant and equipment useful life       30 years        
Furniture and Fixtures                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Property, plant and equipment useful life       5 years        
Riverchase Landing and The Clusters                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Number of consolidated VIEs | variable_interest_entity 2              
RiverBanc, RBMI, and RBDHC                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Equity method investment, cumulative percentage ownership after all transactions   100.00%