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Summary of Significant Accounting Policies - (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) item | Dec. 31, 2015 USD ($) item
Loans Receivable Held For Investment |  |  |
Delinquency period for interest income on loans to be discontinued |  | 90 days |
Loans Purchased |  |  |
Allowance for loan losses | $ |  | $ 0 |
Payments to Acquire Loans and Leases Held-for-investment | $ |  |  | $ 100,161
Allowance for Loan Losses |  |  |
Term during which historical loss component of allowance is determined |  | 3 years |
Operating Segments |  |  |
Number of active operating subsidiaries | item |  | 1 | 1
Number of Reportable Segments | item |  | 1 |
Maximum |  |  |
Investment in Affordable Housing Limited Partnership |  |  |
Ownership percentage |  | 5.00% |
Retirement Plans |  |  |
Cash contributions (as a percent) |  | 25.00% |
Office buildings and improvements | Minimum |  |  |
Office Properties and Equipment |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |
Office buildings and improvements | Maximum |  |  |
Office Properties and Equipment |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |
Furniture, fixtures and equipment | Minimum |  |  |
Office Properties and Equipment |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |
Furniture, fixtures and equipment | Maximum |  |  |
Office Properties and Equipment |  |  |
Property, Plant and Equipment, Useful Life |  | 10 years |
Single family |  |  |
Loans Purchased |  |  |
Payments to Acquire Loans and Leases Held-for-investment | $ | $ 99,700 |  |
Deposits | Long-time Customer |  |  |
Concentration of Credit Risk |  |  |
Concentration Risk, Percentage |  | 11.00% |
Federal Reserve Bank |  |  |
Cash Flows |  |  |
Restricted Cash and Cash Equivalents | $ |  | $ 0 |
Los Angeles, California |  |  |
Nature of Operations and Principles of Consolidation |  |  |
Number of retail-banking offices | item |  | 2 |
Nearby city of Inglewood, California |  |  |
Nature of Operations and Principles of Consolidation |  |  |
Number of retail-banking offices | item |  | 1 |

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