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Mortgage Loans on Real Estate (Narrative) (Details) $ in Thousands | 12 Months Ended
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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 |

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