Fair Value Measurements - Valuation and Inputs, at FV (Details) - Recurring $ in Thousands	Jun. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($) $ / shares item
Fair value inputs, quantitative information
Asset, fair value	$ 593,695	$ 399,176
Liabilities, fair value	9,106	5,250
Level 3 inputs
Fair value inputs, quantitative information
Asset, fair value	217,391	114,660
Loans, held at fair value \| Level 3 inputs \| Third Party Mark
Fair value inputs, quantitative information
Asset, fair value	$ 124,298	$ 20,212
Debt Instrument, Measurement Input [Extensible List]	Third Party Mark	Third Party Mark
Loans, held at fair value \| Level 3 inputs \| Third Party Mark \| Measurement Input, Share Price \| Minimum
Fair value inputs, quantitative information
Debt instrument, measurement input \| item	94.31	100.47
Loans, held at fair value \| Level 3 inputs \| Third Party Mark \| Measurement Input, Share Price \| Maximum
Fair value inputs, quantitative information
Debt instrument, measurement input \| item	107.74	110.83
Loans, held at fair value \| Level 3 inputs \| Third Party Mark \| Measurement Input, Share Price \| Weighted Average
Fair value inputs, quantitative information
Debt instrument, measurement input \| item	99.60	103.31
Mortgage backed securities \| Level 3 inputs \| Third Party Mark
Fair value inputs, quantitative information
Asset, fair value	$ 308	$ 357
Debt Instrument, Measurement Input [Extensible List]	Third Party Mark	Third Party Mark
Mortgage backed securities \| Level 3 inputs \| Third Party Mark \| Measurement Input, Share Price \| Minimum
Fair value inputs, quantitative information
Debt instrument, measurement input \| item	1.00	1.00
Mortgage backed securities \| Level 3 inputs \| Third Party Mark \| Measurement Input, Share Price \| Maximum
Fair value inputs, quantitative information
Debt instrument, measurement input \| item	1.00	1.00
Mortgage backed securities \| Level 3 inputs \| Third Party Mark \| Measurement Input, Share Price \| Weighted Average
Fair value inputs, quantitative information
Debt instrument, measurement input	1.00	1.00
Mortgage backed securities \| Level 3 inputs \| Transaction Price
Fair value inputs, quantitative information
Asset, fair value	$ 103	$ 103
Debt Instrument, Measurement Input [Extensible List]	Transaction Price	Transaction Price
Mortgage backed securities \| Level 3 inputs \| Transaction Price \| Measurement Input, Share Price \| Minimum
Fair value inputs, quantitative information
Debt instrument, measurement input \| item	99.00	99.00
Mortgage backed securities \| Level 3 inputs \| Transaction Price \| Measurement Input, Share Price \| Maximum
Fair value inputs, quantitative information
Debt instrument, measurement input \| item	99.00	99.00
Mortgage backed securities \| Level 3 inputs \| Transaction Price \| Measurement Input, Share Price \| Weighted Average
Fair value inputs, quantitative information
Debt instrument, measurement input	99.00	99.00
Interest-Only-Strips \| Level 3 inputs \| Third Party Mark \| Weighted Average
Fair value inputs, quantitative information
Asset, fair value	$ 300	$ 400
Mortgage servicing rights \| Level 3 inputs \| Discounted Cash Flow
Fair value inputs, quantitative information
Asset, fair value	$ 73,645	$ 91,174
Debt Instrument, Measurement Input [Extensible List]	Discounted Cash Flow	Discounted Cash Flow

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

+ Details

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

- Definition

Value of input used to measure debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Indicates measurement input for debt instrument, including, but not limited to, convertible and non-convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 31
-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14210-108612

+ Details

Name:	us-gaap_DebtInstrumentMeasurementInputExtensibleList
Namespace Prefix:	us-gaap_
Data Type:	srt-types:extensibleListItemType
Balance Type:	na
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_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_LoansReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_MarketApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputSharePriceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_CostApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_InterestOnlyStripMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=rc_ResidentialMortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ValuationTechniqueAxis=us-gaap_IncomeApproachValuationTechniqueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: