XML 58 R48.htm IDEA: XBRL DOCUMENT v3.8.0.1
Summary of Significant Accounting Policies (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Oct. 01, 2017
USD ($)
Mar. 31, 2017
USD ($)
variable_interest_entity
May 31, 2015
Mar. 31, 2018
USD ($)
segment
Dec. 31, 2017
USD ($)
securitization
Jan. 23, 2017
Dec. 31, 2006
securitization
Dec. 31, 2005
securitization
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Investment securities available for sale       $ 1,400,370,000 $ 1,413,081,000      
Residential mortgage loans, delinquency period       90 days        
Goodwill       $ 25,222,000 25,222,000      
Goodwill impairment $ 0              
Restricted cash   $ 70,525,000   808,000 20,300,000      
Interest receivable       33,400,000 33,600,000      
Deferred finance costs, gross       500,000 700,000      
Employer contributions       $ 0 $ 0      
Number of operating segments | segment       1        
Performance Share Awards                
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]                
Convertible note discount, percentage           4.00%    
Discount and deferred issuance costs, net of amortization       $ 8,800,000        
Consolidated K-Series | K-Series                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Number of securitizations | securitization         7   4 4
Distressed Residential Mortgage Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Deferred finance costs, gross       500,000 $ 700,000      
Held in Agency IO Portfolio for Trading Purposes                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Restricted cash         500,000      
Held by Counterparties as Collateral for Hedging Instruments                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Restricted cash       100,000 9,900,000      
Receivables and other assets                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Real estate under development       $ 21,600,000 22,900,000      
Minimum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finite-lived intangible asset, useful life       6 months        
Maximum                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Finite-lived intangible asset, useful life       10 years        
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            
Agency IOs                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Investment securities available for sale       $ 18,385,000 $ 31,179,000