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Troubled Debt Restructurings Schedule Of Troubled Debt Restructurings On Financing Receivables (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018 USD ($) contract	Jun. 30, 2018 USD ($) contract	Jun. 30, 2017 contract
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 86	$ 86
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 86	$ 86
Troubled Debt Restructuring Modifications Number Of Contracts | contract	1	1	0
Residential Single Family
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 86	$ 86
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 86	$ 86
Troubled Debt Restructuring Modifications Number Of Contracts | contract	1	1

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Troubled Debt Restructuring, Subsequent Periods [Line Items]

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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