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Commitments and Contingencies - Additional Information (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 48 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) lease | Jul. 15, 2010 plaintiff | Jun. 30, 2019 USD ($) lease | Dec. 31, 2018 USD ($) partnership | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) loan lease certificate repurchase_request | Jun. 30, 2018 USD ($) | Dec. 31, 2007 certificate | Dec. 31, 2004 certificate | Dec. 31, 2007 certificate | Mar. 01, 2019 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lessee, number of leases | lease | 5 |  | 5 |  |  | 5 |  |  |  |  |  |  |
Present value of remaining lease payments | $ 16,178 |  | $ 16,178 |  |  | $ 16,178 |  |  |  |  |  |  |
Operating lease expense |  |  |  |  |  | $ 1,000 | $ 1,000 |  |  |  |  |  |
Number of noncancelable leases | lease | 4 |  | 4 |  |  | 4 |  |  |  |  |  |  |
Number of leases qualified as short-term lease | lease |  |  |  |  |  | 1 |  |  |  |  |  |  |
Lease liability | $ 13,082 |  | $ 13,082 | $ 0 |  | $ 13,082 |  |  |  |  |  |  |
Right-of-use asset | $ 11,573 |  | $ 11,573 | $ 0 |  | $ 11,573 |  |  |  |  |  |  |
Number of leases without implicit interest rate | lease |  |  |  |  |  | 4 |  |  |  |  |  |  |
Weighted average remaining lease term | 8 years |  | 8 years |  |  | 8 years |  |  |  |  |  |  |
Discount rate | 5.30% |  | 5.30% |  |  | 5.30% |  |  |  |  |  |  |
Number of partnerships, committed to fund | partnership |  |  |  | 2 |  |  |  |  |  |  |  |  |
Commitment to fund partnership, funded amount | $ 6,000 |  | $ 6,000 |  |  | $ 6,000 |  |  |  |  |  |  |
Commitment to fund partnership |  |  |  |  |  | 66,000 |  |  |  |  |  |  |
Contingent consideration | 24,932 |  | 24,932 | $ 0 |  | 24,932 |  |  |  |  |  |  |
Other income related to risk sharing agreement |  |  | 800 |  | $ 1,020 | 1,446 | 1,799 |  |  |  |  |  |
Guarantee obligations | 15,744 |  | 15,744 | 16,711 |  | 15,744 |  |  |  |  |  |  |
Guarantee obligations, credit reserve | 5,000 |  | 5,000 |  |  | 5,000 |  |  |  |  |  |  |
Special Purpose Entities (SPEs) assets | 48,000 |  | 48,000 | 47,000 |  | 48,000 |  |  |  |  |  |  |
Special Purpose Entities (SPEs) liabilities | 16,000 |  | 16,000 | 17,000 |  | 16,000 |  |  |  |  |  |  |
Residential repurchase reserve | 3,769 |  | 3,769 | 4,189 |  | $ 3,769 |  |  |  |  |  |  |
Number of residential repurchase requests (in repurchase requests) | repurchase_request |  |  |  |  |  | 7 |  |  |  |  |  |  |
Number of loans repurchased | loan |  |  |  |  |  | 0 |  |  |  |  |  |  |
Residential repurchase provisions recorded |  |  |  |  |  | $ (400) |  |  |  |  |  |  |
Reversal of repurchase provision |  |  |  |  |  |  | (500) |  |  |  |  |  |
Aggregate amount of loss contingency reserves | 2,000 |  | 2,000 | 2,000 |  | $ 2,000 |  |  |  |  |  |  |
Morgan Stanley And Company |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage pass-through certificates issued (in certificates) | certificate |  |  |  |  |  | 28 |  |  |  |  |  |  |
Sequoia Residential Funding |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage pass-through certificates issued (in certificates) | certificate |  |  |  |  |  |  |  | 2 | 2 | 4 |  |  |
Number of certificated withdrawn | certificate |  |  |  |  |  |  |  |  | 1 | 8 |  |  |
Schwab |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other named defendants along with SRF (in plaintiffs) | plaintiff |  | 26 |  |  |  |  |  |  |  |  |  |  |
Residential Loans |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan principal | 1,030,000 |  | 1,030,000 | $ 1,030,000 |  | $ 1,030,000 |  |  |  |  |  |  |
Loans held-for-investment, in foreclosure | 2,000 |  | 2,000 |  |  | 2,000 |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Other income related to risk sharing agreement |  |  | 1,000 |  | 1,000 | 1,000 | 2,000 |  |  |  |  |  |
Mortgage banking and investment activities |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Market valuation changes in fair value of guarantee asset (less than for three months ending June 30, 2015) |  |  | (100) |  | $ (200) | 100 | $ (300) |  |  |  |  |  |
Guarantee Obligations |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Original unpaid balance of loans subject to risk sharing agreements |  |  |  |  |  |  |  |  |  |  |  | $ 3,190,000 | $ 3,190,000
Potential future payments on loans | 44,000 |  | 44,000 |  |  | 44,000 |  |  |  |  |  |  |
Loan principal | $ 1,740,000 |  | $ 1,740,000 |  |  | $ 1,740,000 |  |  |  |  |  |  |
Weighted average original Fair Isaac Corporation (FICO) score | 759 |  | 759 |  |  | 759 |  |  |  |  |  |  |
Weighted average original loan-to-value (LTV) | 76.00% |  | 76.00% |  |  | 76.00% |  |  |  |  |  |  |
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Balance of loans 90 days or more delinquent | $ 6,000 |  | $ 6,000 |  |  | $ 6,000 |  |  |  |  |  |  |
Residential | Sequoia | FHLB Seattle |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal value | 133,000 |  | 133,000 |  |  | 133,000 |  |  |  |  |  |  |
Debt instrument principal payment amount |  |  |  |  |  | 127,000 |  |  |  |  |  |  |
Debt instrument interest payment amount |  |  |  |  |  | 12,000 |  |  |  |  |  |  |
Residential | Sequoia | Schwab |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal value | 15,000 |  | 15,000 |  |  | 15,000 |  |  |  |  |  |  |
Principal balance of securities | 14,000 |  | 14,000 |  |  | 14,000 |  |  |  |  |  |  |
Debt instrument interest amount | 1,000 |  | 1,000 |  |  | 1,000 |  |  |  |  |  |  |
Financial Guarantee |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment to fund partnership | 49,000 |  |  |  |  |  |  |  |  |  |  |  |
Guarantor obligations, current carrying value | 100 |  | 100 |  |  | 100 |  |  |  |  |  |  |
Guarantor obligations, maximum exposure, undiscounted | 135,000 |  | 135,000 |  |  | 135,000 |  |  |  |  |  |  |
ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liability | 13,000 |  | 13,000 |  |  | 13,000 |  |  |  |  |  |  |
Right-of-use asset | 12,000 |  | 12,000 |  |  | 12,000 |  |  |  |  |  |  |
Commitment To Fund Residential Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to fund temporary advances | 33,000 |  | 33,000 |  |  | 33,000 |  |  |  |  |  |  |
Commitment To Fund Temporary Advances On Residential Bridge Loans |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments to fund temporary advances | $ 80,000 |  | $ 80,000 |  |  | $ 80,000 |  |  |  |  |  |  |
5 Arches, LLC |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration maximum amount |  |  |  |  |  |  |  |  |  |  | $ 27,000 |  |
Contingent consideration |  |  |  |  |  |  |  |  |  |  | $ 24,621 |  |

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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Weighted average discount rate for operating lease calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(4) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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