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Loans, Held for Investment - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
$ / ft²
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for loan losses and impairment $ 5,000 $ 15,000 $ 5,000 $ 15,000  
Commercial Mortgage and Subordinated Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for loan losses and impairment     (1,981)    
Commercial Mortgage Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for loan losses and impairment     11,981   $ 10,000
Fair value inputs, terminal capitalization rate         11.00%
Fair value inputs, discount rate         10.00%
Subordinate Mortgage Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for loan losses and impairment     $ 5,000   $ 5,000
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for loan losses and impairment $ 1,981        
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Fair value inputs, price per square foot | $ / ft²     678    
Fair value inputs, discount rate     15.00%    
Multifamily - Williston, ND [Member] | Commercial Mortgage Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for loan losses and impairment         10,000
Multifamily - Williston, ND [Member] | Subordinate Mortgage Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for loan losses and impairment         $ 5,000
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Impairment of real estate loan     $ 3,019