Variable Interest Entities (Details) - entity	Dec. 31, 2019	Dec. 31, 2018
Private-label Securitizations [Line Items]
Number of variable interest entities	0	0
Agency - Commercial
Private-label Securitizations [Line Items]
Ownership interest in investment	5.00%

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.

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