Mortgage Loans on Real Estate (Narrative) (Details) $ in Thousands	3 Months Ended
Mar. 31, 2024 USD ($) segment loan properties	Mar. 31, 2023 USD ($) loan	Dec. 31, 2023 USD ($) loan properties
Loans and Leases Receivable Disclosure [Line Items]
Number of portfolio segments that make up financing receivables \| segment	3
Commitments outstanding	$ 575,800
Accrued interest receivable	$ 62,800		$ 69,500
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued investment income (2024 and 2023 include $4,136 and $2,862 related to consolidated variable interest entities)
Real estate owned, number of properties \| properties	14		12
Real estate owned	$ 9,700		$ 6,500
Non-accrual status, number of loans \| loan	198		155
Interest income recognized on non-accrual loans	$ 270	$ 15
Number of significant mortgage loan modifications \| loan	0	0
Minimum
Loans and Leases Receivable Disclosure [Line Items]
Number of days past due, nonperforming	90 days
Agricultural 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
Commercial Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Accrued interest receivable written off	$ 0	$ 0

Number of loans in nonaccrual status.

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The number of portfolio segments which make up financing receivables.

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Threshold period for when financing receivable is considered nonperforming.

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Real Estate Acquired Through Foreclosure, Number of Units

+ References

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Amount, after allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 3A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3A

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Indicates line item in statement of financial position that includes accrued interest, after allowance for credit loss, on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3A

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Amount of writeoff of accrued interest on financing receivable recognized by reversing interest income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-3D

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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
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-3

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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
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

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Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

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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.

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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
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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