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Mortgage Loans on Real Estate (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) loans portfolio_segment	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) loans portfolio_segment	Jun. 30, 2020 USD ($)	Dec. 31, 2020 loans
Loans and Leases Receivable Disclosure [Line Items]
Number of portfolio segments that make up financing receivables | portfolio_segment	3		3
Commitments outstanding	$ 177,600		$ 177,600
Non-accrual status, number of loans | loans	10		10		1
Interest income recognized on non-accrual loans	$ 0	$ 0	$ 0	$ 0
Financing receivable, modifications, period of time of delaying principal and/or interest			3 months
Number of TDRs | loans			0		0
Minimum
Loans and Leases Receivable Disclosure [Line Items]
Number of days past due, delinquent status			60 days
Number of days past due, non-accrual status			90 days
Commercial Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Accrued interest receivable written off	0		$ 0
Residential Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Accrued interest receivable written off	0		0
Agricultural
Loans and Leases Receivable Disclosure [Line Items]
Accrued interest receivable written off	$ 0		$ 0

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Financing receivable, modifications, period of time of delaying principal and / or interest.

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The number of portfolio segments which make up financing receivables.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3D
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267969-210447

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Amount of undisbursed portion of financing receivable balance. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5066-111524

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Number of financing receivables that have been modified by troubled debt restructurings.

+ 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 http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Amount of interest income on financing receivable on nonaccrual status.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

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