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Mortgage Loans on Real Estate (Rollforward of Valuation Allowance on Mortgage Loan Portfolios) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	$ (40,395)	$ (32,388)	$ (36,972)	$ (24,024)
Charge-offs	0	414	0	414
Recoveries	0	1,086	0	1,315
Change in provision for credit losses	(4,687)	(4,716)	(8,110)	(13,309)
Ending allowance balance	(45,082)	(35,604)	(45,082)	(35,604)
Commercial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	(21,330)	(24,244)	(22,428)	(17,926)
Charge-offs	0	414	0	414
Recoveries	0	1,086	0	1,315
Change in provision for credit losses	(472)	(869)	626	(7,416)
Ending allowance balance	(21,802)	(23,613)	(21,802)	(23,613)
Agricultural
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	(895)	(664)	(1,021)	(519)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Change in provision for credit losses	(210)	(146)	(84)	(291)
Ending allowance balance	(1,105)	(810)	(1,105)	(810)
Residential
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning allowance balance	(18,170)	(7,480)	(13,523)	(5,579)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Change in provision for credit losses	(4,005)	(3,701)	(8,652)	(5,602)
Ending allowance balance	$ (22,175)	$ (11,181)	$ (22,175)	$ (11,181)

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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X

- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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X

- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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X

- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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