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Mortgage Loans on Real Estate (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loans portfolio_segment | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) loans portfolio_segment | Sep. 30, 2020 USD ($) | Dec. 31, 2020 loans
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Number of portfolio segments that make up financing receivables | portfolio_segment | 3 |  | 3 |  |
Commitments outstanding | $ 44,000 |  | $ 44,000 |  |
Non-accrual status, number of loans | loans | 13 |  | 13 |  | 1
Interest income recognized on non-accrual loans | $ 3 | $ 0 | $ 36 | $ 0 |
Financing receivable, modifications, period of time of delaying principal and/or interest |  |  | 3 months |  |
Number of TDRs | loans |  |  | 0 |  | 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 |  |
Residential Mortgage Loans |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Accrued interest receivable written off | 0 |  | 0 |  |
Agricultural |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |
Accrued interest receivable written off | $ 0 |  | $ 0 |  |

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