Variable Interest Entities - Narrative (Details) $ in Millions	Dec. 31, 2021 USD ($)
VIE - Primary Beneficiary \| Residential mortgage loans in securitization trust
Variable Interest Entity [Line Items]
Unpaid principal balance	$ 703.5

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.

No definition available.

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