Mortgage Loans on Real Estate (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2020 USD ($) portfolio_segment loans	Dec. 31, 2019 USD ($) loans	Dec. 31, 2018 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Number of portfolio segments that make up financing receivables \| portfolio_segment	3
Commitments outstanding	$ 75,300
Allowance for credit loss, economic factors forecast period, years	2 years
Real estate owned	$ 0	$ 0
Number of loans in non-accrual status \| loans	1	0
Interest income recognized on non-accrual loans	$ 0	$ 0	$ 0
Financing receivable, modifications, period of time of delaying principal and/or interest, months	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
Collateral dependent loans	0	$ 0
Residential Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Accrued interest receivable written off	0
Collateral dependent loans	0	0
Agricultural Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Accrued interest receivable written off	0
Collateral dependent loans	$ 0	$ 0

Number of days past due for loans to be considered delinquent.

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- Definition

Amount of write off of accrued interest on financing receivable

+ References

No definition available.

+ Details

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- Definition

Number of years economic factors are forecasted.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Number of loans in nonaccrual status.

+ References

No definition available.

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- Definition

The number of portfolio segments which make up financing receivables.

+ References

No definition available.

+ Details

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- Definition

Mortgage loans on real estate at the reporting date that are not performing and will probably be satisfied by taking ownership of the real estate serving as collateral.

+ References

No definition available.

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- Definition

Number of days past due for loans to be placed on non-accrual status.

+ References

No definition available.

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- Definition

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=118936363&loc=d3e5066-111524

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- Definition

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=118936363&loc=SL6953676-111524

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- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

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=119407570&loc=SL82919258-210447

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- Definition

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

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5162-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4437-111522

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