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Summary of Significant Accounting Policies (Details)
 1 Months Ended 12 Months Ended
Mar. 31, 2017
variable_interest_entity
Dec. 15, 2016
shares
May 16, 2016
May 31, 2015
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Oct. 01, 2017
USD ($)
Jan. 23, 2017
Oct. 01, 2016
USD ($)
Dec. 31, 2006
securitization
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Residential mortgage loans, delinquency period         90 days          
Goodwill         $ 25,222,000 $ 25,222,000        
Goodwill accumulated impairment             $ 0   $ 0  
Restricted cash and cash equivalents         20,300,000 56,000,000        
Interest receivable         33,600,000 24,100,000        
Redeemed remaining shares of stock completing withdrawal of membership | shares   21,700                
Deferred finance costs         700,000 1,400,000        
Employer contributions to employee benefit plan         $ 0 100,000        
Number of operating segments | segment         1          
Number of reportable segments | segment         1          
Accounting Standards Update 2016-18                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Restricted cash and cash equivalents         $ 20,300,000 56,000,000        
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]                    
Discount at issuance (percent)               4.00%    
Unamortized discount (premium) and debt issuance costs         9,300,000          
Consolidated K-Series | K-Series                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Number of securitizations | securitization                   4
Financing arrangements, residential mortgage loans                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Deferred finance costs         700,000 1,300,000        
Held in Agency IO Portfolio for Trading Purposes                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Restricted cash and cash equivalents         500,000 35,600,000        
Held By Counterparties As Collateral For Hedging Instruments [Member]                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Restricted cash and cash equivalents         9,900,000 6,100,000        
Receivables And Other Assets                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Inventory, real estate, construction in process         $ 22,900,000 $ 17,500,000        
Minimum                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Finite-lived intangible asset, useful life     1 year              
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%