Loans Held for Investment - Key Characteristics of Residential Loan Portfolio (Details) $ in Thousands	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans \| loan	116,876	114,946
Loans Held for Investment at Fair Value \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Number of loans \| loan	116,876	114,946
Weighted average maturity (years)	20 years 10 months 24 days	19 years 3 months 18 days
Weighted average loan to value	82.20%	84.20%
Weighted average FICO	658	656
Weighted average loan balance (in thousands) \| $	$ 103	$ 96
Weighted average percentage owner-occupied	87.50%	88.80%
Weighted average percentage single family residence	79.30%	82.20%
Underlying mortgages excluded from portfolio \| $		$ 437,000
Loans Held for Investment at Fair Value \| CA \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top five states	14.60%	13.90%
Loans Held for Investment at Fair Value \| NY \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top five states	8.50%	8.00%
Loans Held for Investment at Fair Value \| FL \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top five states	8.50%	8.10%
Loans Held for Investment at Fair Value \| PA \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top five states	4.50%	4.80%
Loans Held for Investment at Fair Value \| VA \| Seasoned Subprime Residential Mortgage Loans
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Weighted average geographic concentration of top five states	4.40%	4.80%

Indicates the number of mortgages under each classification.

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- Definition

Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]

+ References

No definition available.

+ Details

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- Definition

The weighted average maturity period of underlying mortgages, which is based on their current face amounts.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted average of underlying mortgages at amortized cost to their fair values determined using defined pricing methodologies.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted average credit score of underlying mortgages based on their FICO ratings.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the percentage of unpaid principal amount of underlying mortgages originated in a specified territory.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted average of unpaid principal amounts of underlying mortgages.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted average of underlying mortgages that are owner occupied.

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the weighted average of underlying mortgages that are single family residences.

+ References

No definition available.

+ Details

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- Definition

Amount of undisbursed portion of financing receivable balance. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5066-111524

+ Details

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- Details

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