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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Commercial Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | $ 94,924 | $ 543,991
Amortized cost, originated in fiscal year before latest fiscal year | 539,326 | 755,584
Amortized cost, originated two years before latest fiscal year | 753,362 | 527,670
Amortized cost, originated three years before latest fiscal year | 506,817 | 459,055
Amortized cost, originated four years before latest fiscal year | 448,100 | 411,834
Amortized cost, originated five or more years before latest fiscal year | 1,115,941 | 880,754
Mortgage loans, amortized cost | 3,458,470 | 3,578,888
Commercial Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 94,924 | 543,991
Amortized cost, originated in fiscal year before latest fiscal year | 539,326 | 755,584
Amortized cost, originated two years before latest fiscal year | 753,362 | 527,670
Amortized cost, originated three years before latest fiscal year | 506,817 | 459,055
Amortized cost, originated four years before latest fiscal year | 448,100 | 411,834
Amortized cost, originated five or more years before latest fiscal year | 1,115,941 | 880,754
Mortgage loans, amortized cost | 3,458,470 | 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, amortized cost | 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, amortized cost | 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, amortized cost | 0 | 0
Agricultural |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 30,416 | 196,190
Amortized cost, originated in fiscal year before latest fiscal year | 201,319 | 23,983
Amortized cost, originated two years before latest fiscal year | 19,984 | 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, amortized cost | 276,719 | 245,173
Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 30,416 | 196,190
Amortized cost, originated in fiscal year before latest fiscal year | 199,731 | 23,983
Amortized cost, originated two years before latest fiscal year | 19,984 | 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, amortized cost | 275,131 | 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 | 1,588 | 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, amortized cost | 1,588 | 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, amortized cost | 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, amortized cost | 0 | 0
Residential Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 185,563 | 347,207
Amortized cost, originated in fiscal year before latest fiscal year | 384,590 | 25,250
Amortized cost, originated two years before latest fiscal year | 21,184 | 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, amortized cost | 591,337 | 372,457
Residential Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 183,180 | 321,779
Amortized cost, originated in fiscal year before latest fiscal year | 369,038 | 24,951
Amortized cost, originated two years before latest fiscal year | 20,126 | 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, amortized cost | 572,344 | 346,730
Residential Mortgage Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 2,383 | 25,150
Amortized cost, originated in fiscal year before latest fiscal year | 7,652 | 299
Amortized cost, originated two years before latest fiscal year | 107 | 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, amortized cost | 10,142 | 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 | 2,992 | 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, amortized cost | 2,992 | 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 | 4,908 | 0
Amortized cost, originated two years before latest fiscal year | 951 | 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, amortized cost | $ 5,859 | $ 167

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