(5) Securitization Trust Debt (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Receivables Pledged at end of period	$ 1,954,617
Initial Principal	6,271,209
Outstanding Principal	1,771,953	$ 1,814,320
Securitization Trust Debt [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Securitization trust debt, expected payment 2022	687,900
Securitization trust debt, expected payment 2023	621,200
Securitization trust debt, expected payment 2024	150,600
Securitization trust debt, expected payment 2025	167,000
Securitization trust debt, expected payment 2026	92,100
Securitization trust debt, expected payment 2027	$ 41,200
CPS 2015-B [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	September 2022
Receivables Pledged at end of period	$ 0
Initial Principal	250,000
Outstanding Principal	$ 0	17,984
Weighted Average Contractual Interest Rate	0.00%
CPS 2015-C [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	December 2022
Receivables Pledged at end of period	$ 0
Initial Principal	300,000
Outstanding Principal	$ 0	28,529
Weighted Average Contractual Interest Rate	0.00%
CPS 2016-A [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	March 2023
Receivables Pledged at end of period	$ 0
Initial Principal	329,460
Outstanding Principal	$ 0	37,158
Weighted Average Contractual Interest Rate	0.00%
CPS 2016-B [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	June 2023
Receivables Pledged at end of period	$ 0
Initial Principal	332,690
Outstanding Principal	$ 0	46,079
Weighted Average Contractual Interest Rate	0.00%
CPS 2016-C [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	September 2023
Receivables Pledged at end of period	$ 0
Initial Principal	318,500
Outstanding Principal	$ 0	47,325
Weighted Average Contractual Interest Rate	0.00%
CPS 2016-D [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	April 2024
Receivables Pledged at end of period	$ 0
Initial Principal	206,325
Outstanding Principal	$ 0	36,455
Weighted Average Contractual Interest Rate	0.00%
CPS 2017-A [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	April 2024
Receivables Pledged at end of period	$ 21,381
Initial Principal	206,320
Outstanding Principal	$ 17,644	40,619
Weighted Average Contractual Interest Rate	7.07%
CPS 2017-B [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	December 2023
Receivables Pledged at end of period	$ 27,922
Initial Principal	225,170
Outstanding Principal	$ 12,491	39,016
Weighted Average Contractual Interest Rate	5.75%
CPS 2017-C [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	September 2024
Receivables Pledged at end of period	$ 30,061
Initial Principal	224,825
Outstanding Principal	$ 25,846	47,553
Weighted Average Contractual Interest Rate	5.68%
CPS 2017-D [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	June 2024
Receivables Pledged at end of period	$ 30,994
Initial Principal	196,300
Outstanding Principal	$ 26,744	49,297
Weighted Average Contractual Interest Rate	4.95%
CPS 2018-A [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	March 2025
Receivables Pledged at end of period	$ 34,363
Initial Principal	190,000
Outstanding Principal	$ 29,518	53,549
Weighted Average Contractual Interest Rate	4.68%
CPS 2018-B [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	December 2024
Receivables Pledged at end of period	$ 42,054
Initial Principal	201,823
Outstanding Principal	$ 36,092	66,955
Weighted Average Contractual Interest Rate	5.10%
CPS 2018-C [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	September 2025
Receivables Pledged at end of period	$ 47,708
Initial Principal	230,275
Outstanding Principal	$ 42,765	77,345
Weighted Average Contractual Interest Rate	5.27%
CPS 2018-D [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	June 2025
Receivables Pledged at end of period	$ 58,204
Initial Principal	233,730
Outstanding Principal	$ 49,634	88,228
Weighted Average Contractual Interest Rate	5.12%
CPS 2019-A [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	March 2026
Receivables Pledged at end of period	$ 72,750
Initial Principal	254,400
Outstanding Principal	$ 62,667	114,373
Weighted Average Contractual Interest Rate	4.90%
CPS 2019-B [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	June 2026
Receivables Pledged at end of period	$ 72,683
Initial Principal	228,275
Outstanding Principal	$ 61,730	118,982
Weighted Average Contractual Interest Rate	4.61%
CPS 2019-C [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	September 2026
Receivables Pledged at end of period	$ 85,381
Initial Principal	243,513
Outstanding Principal	$ 75,065	142,080
Weighted Average Contractual Interest Rate	3.76%
CPS 2019-D [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	December 2026
Receivables Pledged at end of period	$ 109,469
Initial Principal	274,313
Outstanding Principal	$ 98,625	181,485
Weighted Average Contractual Interest Rate	3.20%
CPS 2020-A [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	March 2027
Receivables Pledged at end of period	$ 104,000
Initial Principal	260,000
Outstanding Principal	$ 99,485	184,944
Weighted Average Contractual Interest Rate	3.32%
CPS 2020-B [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	June 2027
Receivables Pledged at end of period	$ 110,962
Initial Principal	202,343
Outstanding Principal	$ 87,048	164,403
Weighted Average Contractual Interest Rate	4.58%
CPS 2020-C [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	November 2027
Receivables Pledged at end of period	$ 150,173
Initial Principal	252,200
Outstanding Principal	$ 138,899	231,961
Weighted Average Contractual Interest Rate	2.35%
CPS 2021-A [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	March 2028
Receivables Pledged at end of period	$ 162,217
Initial Principal	230,545
Outstanding Principal	$ 147,516	0
Weighted Average Contractual Interest Rate	0.97%
CPS 2021-B
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	June 2028
Receivables Pledged at end of period	$ 189,319
Initial Principal	240,000
Outstanding Principal	$ 179,856	0
Weighted Average Contractual Interest Rate	1.24%
C P S 2021 C [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	September 2028
Receivables Pledged at end of period	$ 264,525
Initial Principal	291,000
Outstanding Principal	$ 250,003	0
Weighted Average Contractual Interest Rate	1.11%
C P S 2021 D [Member]
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Line Items]
Final Scheduled Payment Date	December 2028
Receivables Pledged at end of period	$ 340,451
Initial Principal	349,202
Outstanding Principal	$ 330,325	$ 0
Weighted Average Contractual Interest Rate	1.39%

Final Scheduled Payment Date

No definition available.

Name:	cpss_FinalScheduledPaymentDate
Namespace Prefix:	cpss_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Securitization Trust Debt Initial Principal

+ References

No definition available.

+ Details

Name:	cpss_SecuritizationTrustDebtInitialPrincipal
Namespace Prefix:	cpss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtSecuritiesHeldtomaturityAllowanceForCreditLossLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1E
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1E
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1E
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1E
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495348-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123465755&loc=d3e1835-112601

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24072-122690

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of long-term debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

+ Details

Name:	us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fair value, as of the date of each statement of financial position presented, of finance receivables which are owned but transferred to serve as collateral for the payment of the related debt obligation, and that are reclassified and separately reported in the statement of financial position.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

+ Details

Name:	us-gaap_PledgedAssetsSeparatelyReportedFinanceReceivablesPledgedAsCollateralAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This is the result of the principal amount outstanding of total loans managed or securitized less securitized loans and loans that are in the process of being securitized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

+ Details

Name:	us-gaap_PrincipalAmountOutstandingOfLoansHeldInPortfolio
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant