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Subsequent Events - Narrative (Details) - USD ($) $ in Thousands |  | 1 Months Ended
--- | --- | ---
Oct. 01, 2021 | Nov. 30, 2021 | Oct. 31, 2021 | Jul. 31, 2021
Forecast | U.S Treasury Securities |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument, maturity date |  | Nov. 30, 2021 |  |
U.S. Treasury securities, purchased |  | $ 149,997 |  |
Forecast | Secured Notes |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument, redemption description |  | In November 2021, HoldCo II redeemed $60,000 aggregate principal amount of the Secured Notes pursuant to an optional redemption, which left an outstanding balance of $395,000. |  |
Redemption of aggregate principal amount |  | $ 60,000 |  |
Debt instrument, outstanding balance after redemption |  | $ 395,000 |  |
Extended Maturity |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt instrument, maturity date |  |  |  | Dec. 31, 2021
Subsequent Event |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Gross proceeds from sale of property held-for-sale | $ 8,750 |  | $ 8,750 |
Subsequent Event | Extended Maturity |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Loans Held-for-sale, Term |  |  | 1 year |
Debt instrument, maturity date |  |  | Oct. 31, 2022 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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