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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($) $ in Thousands | Sep. 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 | $ 128,981 | $ 543,991
Amortized cost, originated in fiscal year before latest fiscal year | 537,879 | 755,584
Amortized cost, originated two years before latest fiscal year | 751,659 | 527,670
Amortized cost, originated three years before latest fiscal year | 462,393 | 459,055
Amortized cost, originated four years before latest fiscal year | 409,611 | 411,834
Amortized cost, originated five or more years before latest fiscal year | 1,033,461 | 880,754
Mortgage loans, amortized cost | 3,323,984 | 3,578,888
Commercial Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 128,981 | 543,991
Amortized cost, originated in fiscal year before latest fiscal year | 537,879 | 755,584
Amortized cost, originated two years before latest fiscal year | 751,659 | 527,670
Amortized cost, originated three years before latest fiscal year | 462,393 | 459,055
Amortized cost, originated four years before latest fiscal year | 409,611 | 411,834
Amortized cost, originated five or more years before latest fiscal year | 1,033,461 | 880,754
Mortgage loans, amortized cost | 3,323,984 | 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 | 109,091 | 196,190
Amortized cost, originated in fiscal year before latest fiscal year | 199,792 | 23,983
Amortized cost, originated two years before latest fiscal year | 19,858 | 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 | 353,741 | 245,173
Agricultural | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 109,091 | 196,190
Amortized cost, originated in fiscal year before latest fiscal year | 199,792 | 23,983
Amortized cost, originated two years before latest fiscal year | 19,858 | 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 | 353,741 | 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, amortized cost | 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, 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 | 285,919 | 347,207
Amortized cost, originated in fiscal year before latest fiscal year | 328,837 | 25,250
Amortized cost, originated two years before latest fiscal year | 17,819 | 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 | 632,575 | 372,457
Residential Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 232,026 | 321,779
Amortized cost, originated in fiscal year before latest fiscal year | 316,539 | 24,951
Amortized cost, originated two years before latest fiscal year | 16,520 | 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 | 565,085 | 346,730
Residential Mortgage Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 49,684 | 25,150
Amortized cost, originated in fiscal year before latest fiscal year | 5,343 | 299
Amortized cost, originated two years before latest fiscal year | 389 | 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 | 55,416 | 25,449
Residential Mortgage Loans | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, originated in current fiscal year | 4,209 | 111
Amortized cost, originated in fiscal year before latest fiscal year | 951 | 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 | 5,160 | 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 | 6,004 | 0
Amortized cost, originated two years before latest fiscal year | 910 | 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 | $ 6,914 | $ 167

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