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Restructurings for Borrowers Experiencing Financial Difficulty (Narrative) (Details)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022 USD ($) Contract
Financing Receivable Modifications [Line Items]
Total troubled debt restructured loans | $		$ 0
Mortgage loans on real estate weighted average term	1 year
Number of payment defaults | Contract		0
Residential Single Family
Financing Receivable Modifications [Line Items]
Loan is considered payment default	30 days

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Mortgage loans on real estate weighted average term

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Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

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