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Subsequent Events - USD ($) $ in Millions | Jun. 22, 2023 | Jun. 22, 2022 | Oct. 28, 2021 | Oct. 15, 2021 | Oct. 06, 2021 | Oct. 01, 2021 | Sep. 30, 2021 | Dec. 31, 2020
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Revolving Secured Line of Credit [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Amount available for borrowing | [1] |  |  |  |  |  |  | $ 267.8 | $ 244.1
Subsequent Event [Member] | Revolving Secured Line of Credit [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Amount available for borrowing |  | $ 325.0 | $ 350.0 |  |  | $ 385.0 | $ 340.0 |  |
Subsequent Event [Member] | Warehouse Facility VI [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Amount available for borrowing |  |  |  |  | $ 75.0 |  |  |  |
Subsequent Event [Member] | Term ABS 2021-4 [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Amount available for borrowing |  |  |  | $ 250.1 |  |  |  |  |
[1] | Availability may be limited by the amount of assets pledged as collateral.

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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