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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)

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- 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 + Details
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- 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 + Details
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- 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. + Details
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- 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 + Details
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- 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 + Details
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