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Mortgage Loans on Real Estate (Troubled Debt Restructurings) (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) loans	Dec. 31, 2016 USD ($) loans
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	2	2
Principal balance outstanding	$ 4,918	$ 5,024
Specific loan loss allowance	(467)	(467)
Net carrying amount	$ 4,451	$ 4,557
South Atlantic [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	1	1
Principal balance outstanding	$ 2,962	$ 3,004
Specific loan loss allowance	0	0
Net carrying amount	$ 2,962	$ 3,004
East North Central [Member]
Financing Receivable, Modifications [Line Items]
Number of TDRs | loans	1	1
Principal balance outstanding	$ 1,956	$ 2,020
Specific loan loss allowance	(467)	(467)
Net carrying amount	$ 1,489	$ 1,553

X

- Definition

Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings.

+ References

No definition available.

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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.

+ References

No definition available.

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- Definition

Number of financing receivables that have been 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=66008989&loc=SL6953676-111524

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- Definition

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=66008989&loc=SL6953676-111524

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- Definition

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=66008989&loc=SL6953676-111524

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