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Summary of Significant Accounting Policies - Loans Purchased and Allowance for Loan Losses (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Loans Purchased |  |
Purchase of loans receivable held for investment | $ 0 | $ 24,640
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585 + Details
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