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Mortgage Loans on Real Estate (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) loan segment properties | Dec. 31, 2022 USD ($) loan properties | Dec. 31, 2021 USD ($)
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Number of portfolio segments that make up financing receivables | segment | 3 |  |
Commitments outstanding | $ 786,400 |  |
Accrued interest receivable | $ 69,500 | $ 58,200 |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued investment income (2023 and 2022 include $2,862 and $3,444 related to consolidated variable interest entities) |  |
Real estate acquired through foreclosure, number of units | properties | 12 | 0 |
Real estate acquired through foreclosure | $ 6,500 |  |
Non-accrual status, number of loans | loan | 155 | 59 |
Interest income recognized on non-accrual loans | $ 3,000 | $ 670 | $ 36
Number of significant loan modifications | loan | 0 |  |
Minimum |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Number of days past due, nonperforming | 90 days |  |
Commercial Mortgage Loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Accrued interest receivable written off | $ 0 | 0 |
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 |

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- Definition 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 -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3A + Details
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