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Summary of Significant Accounting Policies (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2017
variable_interest_entity
Oct. 01, 2016
USD ($)
May 16, 2016
May 31, 2015
Sep. 30, 2017
USD ($)
securitization
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
segment
securitization
Sep. 30, 2016
USD ($)
Jan. 23, 2017
Dec. 31, 2016
USD ($)
securitization
Dec. 31, 2015
securitization
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     $ 25,222,000    
Goodwill impairment   $ 0                    
Restricted cash         34,100,000   34,100,000     56,000,000    
Interest receivable         28,100,000   28,100,000     24,100,000    
Deferred finance costs, gross         800,000   800,000     1,400,000    
Employer contributions         0 $ 100,000 $ 0 $ 100,000        
Number of operating segments | segment             1          
Held in Agency IO Portfolio for Trading Purposes                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Restricted cash         8,900,000   $ 8,900,000     35,600,000    
Held by Counterparties as Collateral for Hedging Instruments                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Restricted cash         7,900,000   7,900,000     6,100,000    
Distressed Residential Mortgage Loans                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Deferred finance costs, gross         $ 400,000   $ 400,000     $ 1,300,000    
Consolidated K-Series | K-Series                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of securitizations | securitization         6   6     5 4 4
Receivables and other assets                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Real estate under development         $ 21,900,000   $ 21,900,000     $ 17,500,000    
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             15 months          
Performance Share Awards                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Award vesting period       3 years                
RiverBanc, RBMI, and RBDHC                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Subsidiary cumulative percentage ownership after all transactions     100.00%                  
Accounting Standards Update 2016-18                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Restricted cash         34,100,000 $ 78,600,000 $ 34,100,000 $ 78,600,000        
6.25% senior convertible notes due 2022 | Convertible Notes                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Convertible note discount, percentage                 4.00%      
Discount and deferred issuance costs, net of amortization         $ 9,700,000   $ 9,700,000          
Building                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Components of real estate, useful life             30 years          
Building and Improvements | Minimum                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Components of real estate, useful life             10 years          
Building and Improvements | Maximum                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Components of real estate, useful life             30 years          
Furniture, Fixtures and Equipment                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Components of real estate, useful life             5 years          
Riverchase Landing and The Clusters                        
Accounts, Notes, Loans and Financing Receivable [Line Items]                        
Number of variable interest entities consolidated | variable_interest_entity 2