Mortgage Loans on Real Estate (Narrative) (Details) $ in Thousands	12 Months Ended
Dec. 31, 2022 USD ($) loans portfolio_segment	Dec. 31, 2021 USD ($) loans	Dec. 31, 2020 USD ($)
Loans and Leases Receivable Disclosure [Line Items]
Number of portfolio segments that make up financing receivables \| portfolio_segment	3
Commitments outstanding	$ 420,200
Real estate acquired through foreclosure	$ 0	$ 0
Non-accrual status, number of loans \| loans	59	13
Interest income recognized on non-accrual loans	$ 670	$ 36	$ 0
Number of TDRs \| loans	0	0
Mortgage loans on real estate
Loans and Leases Receivable Disclosure [Line Items]
Accrued interest receivable	$ 58,200	$ 37,000
Minimum
Loans and Leases Receivable Disclosure [Line Items]
Number of days past due, nonperforming	90 days
Financing receivable, modifications, period of time of delaying principal and/or interest (months)	3 months
Commercial Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Principal outstanding	$ 3,560,903	3,633,131
Accrued interest receivable written off	0	0
Residential Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Principal outstanding	2,807,652	1,652,910
Accrued interest receivable written off	0	0
Agricultural Mortgage Loans
Loans and Leases Receivable Disclosure [Line Items]
Principal outstanding	567,630	408,135
Accrued interest receivable written off	$ 0	$ 0

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

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- Definition

Number of loans in nonaccrual status.

+ References

No definition available.

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The number of portfolio segments which make up financing receivables.

+ References

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- Definition

Threshold period for when financing receivable is considered nonperforming.

+ References

No definition available.

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- Definition

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

+ 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 https://asc.fasb.org/extlink&oid=124255953&loc=SL120267969-210447

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=6378536&loc=d3e10095-111533

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.9-03(7))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

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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 https://asc.fasb.org/extlink&oid=123577603&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 https://asc.fasb.org/extlink&oid=123577603&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 https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

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- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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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 https://asc.fasb.org/extlink&oid=123577603&loc=d3e5162-111524

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