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Summary of Significant Accounting Policies - Loans Purchased and Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Loans Purchased |  |  |
Purchase of loans receivable held for investment |  | $ 24,640 | $ 0
Allowance for Loan Losses |  |  |
Length of period over which historical loss experience |  | 5 years |
Single family |  |  |
Loans Purchased |  |  |
Purchase of loans receivable held for investment | $ 24,600 |  |

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- Definition The cash outflow from (a) purchases of loans held-for-investment, (b) purchases of leases held-for-investment, and (c) both. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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