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Residential Loans - Geographic Concentration of Residential Loans Recorded on Consolidated Balance Sheet (Details) - Residential loans, held-for-investment | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 35.00% | 40.00%
Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00% | 9.00%
Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 9.00% | 8.00%
Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 3.00%
Georgia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 41.00% | 36.00%
Legacy Sequoia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Legacy Sequoia | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 18.00% | 18.00%
Legacy Sequoia | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 6.00%
Legacy Sequoia | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 2.00% | 2.00%
Legacy Sequoia | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 13.00% | 14.00%
Legacy Sequoia | Georgia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Legacy Sequoia | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 9.00% | 8.00%
Legacy Sequoia | Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 48.00% | 47.00%
Sequoia Choice |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 0.00%
Sequoia Choice | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 39.00% | 0.00%
Sequoia Choice | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 10.00% | 0.00%
Sequoia Choice | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 7.00% | 0.00%
Sequoia Choice | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 0.00%
Sequoia Choice | Georgia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 0.00%
Sequoia Choice | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 3.00% | 0.00%
Sequoia Choice | Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 34.00% | 0.00%
Redwood |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 100.00% | 100.00%
Redwood | California |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 45.00% | 42.00%
Redwood | Texas |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 9.00% | 10.00%
Redwood | Washington |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 4.00%
Redwood | Florida |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 5.00% | 5.00%
Redwood | Georgia |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 1.00% | 1.00%
Redwood | New York |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 4.00% | 4.00%
Redwood | Other states (none greater than 5%) |  |
Concentration Risk [Line Items] |  |
Concentration risk percentage | 31.00% | 34.00%

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