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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Commercial Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | $ 54,134 | $ 543,991
Amortized cost, originated in fiscal year before latest fiscal year | 541,611 | 755,584
Amortized cost, originated two years before latest fiscal year | 754,416 | 527,670
Amortized cost, originated three years before latest fiscal year | 511,189 | 459,055
Amortized cost, originated four years before latest fiscal year | 455,370 | 411,834
Amortized cost, originated five or more years before latest fiscal year | 1,229,207 | 880,754
Amortized cost | 3,545,927 | 3,578,888
Commercial Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 54,134 | 543,991
Amortized cost, originated in fiscal year before latest fiscal year | 541,611 | 755,584
Amortized cost, originated two years before latest fiscal year | 754,416 | 527,670
Amortized cost, originated three years before latest fiscal year | 511,189 | 459,055
Amortized cost, originated four years before latest fiscal year | 455,370 | 411,834
Amortized cost, originated five or more years before latest fiscal year | 1,229,207 | 880,754
Mortgage loans, current | 3,545,927 | 3,578,888
Commercial Mortgage Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 0 | 0
Amortized cost, originated in fiscal year before latest fiscal year | 0 | 0
Amortized cost, originated two years before latest fiscal year | 0 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, past due | 0 | 0
Commercial Mortgage Loans | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 0 | 0
Amortized cost, originated in fiscal year before latest fiscal year | 0 | 0
Amortized cost, originated two years before latest fiscal year | 0 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, past due | 0 | 0
Commercial Mortgage Loans | Over 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 0 | 0
Amortized cost, originated in fiscal year before latest fiscal year | 0 | 0
Amortized cost, originated two years before latest fiscal year | 0 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, past due | 0 | 0
Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 23,355 | 196,190
Amortized cost, originated in fiscal year before latest fiscal year | 197,147 | 23,983
Amortized cost, originated two years before latest fiscal year | 20,083 | 25,000
Amortized cost, originated three years before latest fiscal year | 25,000 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Amortized cost | 265,585 | 245,173
Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 23,355 | 196,190
Amortized cost, originated in fiscal year before latest fiscal year | 197,147 | 23,983
Amortized cost, originated two years before latest fiscal year | 20,083 | 25,000
Amortized cost, originated three years before latest fiscal year | 25,000 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, current | 265,585 | 245,173
Agricultural | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 0 | 0
Amortized cost, originated in fiscal year before latest fiscal year | 0 | 0
Amortized cost, originated two years before latest fiscal year | 0 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, past due | 0 | 0
Agricultural | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 0 | 0
Amortized cost, originated in fiscal year before latest fiscal year | 0 | 0
Amortized cost, originated two years before latest fiscal year | 0 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, past due | 0 | 0
Agricultural | Over 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 0 | 0
Amortized cost, originated in fiscal year before latest fiscal year | 0 | 0
Amortized cost, originated two years before latest fiscal year | 0 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, past due | 0 | 0
Residential Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 76,510 | 347,207
Amortized cost, originated in fiscal year before latest fiscal year | 406,372 | 25,250
Amortized cost, originated two years before latest fiscal year | 24,722 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Amortized cost | 507,604 | 372,457
Residential Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 72,910 | 321,779
Amortized cost, originated in fiscal year before latest fiscal year | 275,127 | 24,951
Amortized cost, originated two years before latest fiscal year | 20,406 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, current | 368,443 | 346,730
Residential Mortgage Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 3,600 | 25,150
Amortized cost, originated in fiscal year before latest fiscal year | 90,607 | 299
Amortized cost, originated two years before latest fiscal year | 1,981 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, past due | 96,188 | 25,449
Residential Mortgage Loans | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 0 | 111
Amortized cost, originated in fiscal year before latest fiscal year | 37,925 | 0
Amortized cost, originated two years before latest fiscal year | 2,335 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, past due | 40,260 | 111
Residential Mortgage Loans | Over 90 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 0 | 167
Amortized cost, originated in fiscal year before latest fiscal year | 2,713 | 0
Amortized cost, originated two years before latest fiscal year | 0 | 0
Amortized cost, originated three years before latest fiscal year | 0 | 0
Amortized cost, originated four years before latest fiscal year | 0 | 0
Amortized cost, originated five or more years before latest fiscal year | 0 | 0
Mortgage loans, past due | $ 2,713 | $ 167

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