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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 |  |

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