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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 |  |  |

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