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Mortgage Loans on Real Estate (Narrative) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 USD ($) loans portfolio_segment | Mar. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) loans
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Number of portfolio segments that make up financing receivables | portfolio_segment | 3 |  |
Commitments outstanding | $ 444,200 |  |
Real estate owned | $ 0 |  | $ 0
Non-accrual status, number of loans | loans | 34 |  | 13
Interest income recognized on non-accrual loans | $ 0 | $ 0 |
Financing receivable, modifications, period of time of delaying principal and/or interest (months) | 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 Mortgage Loans |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |
Accrued interest receivable written off | $ 0 | $ 0 |

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