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Summary of Significant Accounting Policies (Details)
 12 Months Ended
Mar. 31, 2017
variable_interest_entity
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Oct. 01, 2019
USD ($)
Dec. 31, 2017
USD ($)
Jan. 23, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Goodwill   $ 25,222,000 $ 25,222,000      
Goodwill accumulated impairment       $ 0    
Residential mortgage loans, delinquency period   90 days        
Restricted cash and cash equivalents   $ 2,849,000 5,421,000   $ 11,004,000  
Interest receivable   41,200,000        
Employer contributions to employee benefit plan   $ 0 0      
Number of reportable segments | segment   1        
Performance Shares            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Award vesting period   3 years        
6.25% senior convertible notes due 2022            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Discount at issuance (percent)           4.00%
6.25% senior convertible notes due 2022 | Convertible Notes            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest rate           6.25%
VIE, Primary Beneficiary            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Inventory, real estate, construction in process   $ 20,900,000        
Impairment of real estate   1,900,000 2,800,000      
Net Income (Loss) Attributable to Noncontrolling Interest | VIE, Primary Beneficiary            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Impairment of real estate   1,000,000.0 1,400,000      
Net Loss Attributable to Parent | VIE, Primary Beneficiary            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Impairment of real estate   900,000 1,400,000      
Receivables And Other Assets            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Inventory, real estate, construction in process   $ 14,500,000 22,000,000.0      
Minimum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Finite-lived intangible asset, useful life   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        
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        
RiverBanc, RBMI, and RBDHC            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Goodwill   $ 25,200,000 $ 25,200,000      
Riverchase Landing and The Clusters            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Number of consolidated VIEs | variable_interest_entity 2