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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Commercial Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | $ 7,788 | $ 425,875
Amortized cost, year two, originated in fiscal year before current fiscal year | 461,509 | 592,468
Amortized cost, year three, originated two years before current fiscal year | 600,590 | 486,339
Amortized cost, year four, originated three years before current fiscal year | 479,951 | 591,076
Amortized cost, year five, originated four years before current fiscal year | 581,416 | 416,132
Amortized cost, originated more than five years before current fiscal year | 1,432,653 | 1,042,668
Mortgage loans, amortized cost | 3,563,907 | 3,554,558
Commercial Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 7,788 | 425,875
Amortized cost, year two, originated in fiscal year before current fiscal year | 461,509 | 592,468
Amortized cost, year three, originated two years before current fiscal year | 600,590 | 486,339
Amortized cost, year four, originated three years before current fiscal year | 479,951 | 591,076
Amortized cost, year five, originated four years before current fiscal year | 581,416 | 416,132
Amortized cost, originated more than five years before current fiscal year | 1,432,653 | 1,042,668
Mortgage loans, amortized cost | 3,563,907 | 3,554,558
Commercial Mortgage Loans | 30 - 59 days past due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 0 | 0
Amortized cost, year two, originated in fiscal year before current fiscal year | 0 | 0
Amortized cost, year three, originated two years before current fiscal year | 0 | 0
Amortized cost, year four, originated three years before current fiscal year | 0 | 0
Amortized cost, year five, originated four years before current fiscal year | 0 | 0
Amortized cost, originated more than five years before current 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, year one, originated in current fiscal year | 0 | 0
Amortized cost, year two, originated in fiscal year before current fiscal year | 0 | 0
Amortized cost, year three, originated two years before current fiscal year | 0 | 0
Amortized cost, year four, originated three years before current fiscal year | 0 | 0
Amortized cost, year five, originated four years before current fiscal year | 0 | 0
Amortized cost, originated more than five years before current 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, year one, originated in current fiscal year | 0 | 0
Amortized cost, year two, originated in fiscal year before current fiscal year | 0 | 0
Amortized cost, year three, originated two years before current fiscal year | 0 | 0
Amortized cost, year four, originated three years before current fiscal year | 0 | 0
Amortized cost, year five, originated four years before current fiscal year | 0 | 0
Amortized cost, originated more than five years before current fiscal year | 0 | 0
Mortgage loans, amortized cost | 0 | 0
Agricultural Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 41,988 | 196,347
Amortized cost, year two, originated in fiscal year before current fiscal year | 195,288 | 160,641
Amortized cost, year three, originated two years before current fiscal year | 158,366 | 169,346
Amortized cost, year four, originated three years before current fiscal year | 172,036 | 5,629
Amortized cost, year five, originated four years before current fiscal year | 5,589 | 34,000
Amortized cost, originated more than five years before current fiscal year | 34,000 | 0
Mortgage loans, amortized cost | 607,267 | 565,963
Agricultural Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 41,988 | 196,347
Amortized cost, year two, originated in fiscal year before current fiscal year | 195,288 | 160,641
Amortized cost, year three, originated two years before current fiscal year | 153,023 | 166,211
Amortized cost, year four, originated three years before current fiscal year | 172,036 | 5,629
Amortized cost, year five, originated four years before current fiscal year | 5,589 | 34,000
Amortized cost, originated more than five years before current fiscal year | 34,000 | 0
Mortgage loans, amortized cost | 601,924 | 562,828
Agricultural Mortgage Loans | 30 - 59 days past due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 0 | 0
Amortized cost, year two, originated in fiscal year before current fiscal year | 0 | 0
Amortized cost, year three, originated two years before current fiscal year | 0 | 0
Amortized cost, year four, originated three years before current fiscal year | 0 | 0
Amortized cost, year five, originated four years before current fiscal year | 0 | 0
Amortized cost, originated more than five years before current fiscal year | 0 | 0
Mortgage loans, amortized cost | 0 | 0
Agricultural Mortgage Loans | 60 - 89 days past due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 0 | 0
Amortized cost, year two, originated in fiscal year before current fiscal year | 0 | 0
Amortized cost, year three, originated two years before current fiscal year | 0 | 0
Amortized cost, year four, originated three years before current fiscal year | 0 | 0
Amortized cost, year five, originated four years before current fiscal year | 0 | 0
Amortized cost, originated more than five years before current fiscal year | 0 | 0
Mortgage loans, amortized cost | 0 | 0
Agricultural Mortgage Loans | Over 90 days past due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 0 | 0
Amortized cost, year two, originated in fiscal year before current fiscal year | 0 | 0
Amortized cost, year three, originated two years before current fiscal year | 5,343 | 3,135
Amortized cost, year four, originated three years before current fiscal year | 0 | 0
Amortized cost, year five, originated four years before current fiscal year | 0 | 0
Amortized cost, originated more than five years before current fiscal year | 0 | 0
Mortgage loans, amortized cost | 5,343 | 3,135
Residential Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 224,031 | 1,970,718
Amortized cost, year two, originated in fiscal year before current fiscal year | 2,027,790 | 624,834
Amortized cost, year three, originated two years before current fiscal year | 580,981 | 233,741
Amortized cost, year four, originated three years before current fiscal year | 207,065 | 31,262
Amortized cost, year five, originated four years before current fiscal year | 29,268 | 4,506
Amortized cost, originated more than five years before current fiscal year | 4,542 | 417
Mortgage loans, amortized cost | 3,073,677 | 2,865,478
Residential Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 224,031 | 1,915,169
Amortized cost, year two, originated in fiscal year before current fiscal year | 2,003,711 | 595,363
Amortized cost, year three, originated two years before current fiscal year | 562,310 | 211,119
Amortized cost, year four, originated three years before current fiscal year | 194,720 | 27,483
Amortized cost, year five, originated four years before current fiscal year | 27,631 | 1,710
Amortized cost, originated more than five years before current fiscal year | 1,330 | 417
Mortgage loans, amortized cost | 3,013,733 | 2,751,261
Residential Mortgage Loans | 30 - 59 days past due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 0 | 39,179
Amortized cost, year two, originated in fiscal year before current fiscal year | 16,627 | 8,238
Amortized cost, year three, originated two years before current fiscal year | 2,516 | 13,073
Amortized cost, year four, originated three years before current fiscal year | 4,960 | 1,960
Amortized cost, year five, originated four years before current fiscal year | 57 | 0
Amortized cost, originated more than five years before current fiscal year | 417 | 0
Mortgage loans, amortized cost | 24,577 | 62,450
Residential Mortgage Loans | 60 - 89 days past due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 0 | 6,668
Amortized cost, year two, originated in fiscal year before current fiscal year | 0 | 7,165
Amortized cost, year three, originated two years before current fiscal year | 0 | 3,034
Amortized cost, year four, originated three years before current fiscal year | 0 | 57
Amortized cost, year five, originated four years before current fiscal year | 0 | 0
Amortized cost, originated more than five years before current fiscal year | 0 | 0
Mortgage loans, amortized cost | 0 | 16,924
Residential Mortgage Loans | Over 90 days past due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 0 | 9,702
Amortized cost, year two, originated in fiscal year before current fiscal year | 7,452 | 14,068
Amortized cost, year three, originated two years before current fiscal year | 16,155 | 6,515
Amortized cost, year four, originated three years before current fiscal year | 7,385 | 1,762
Amortized cost, year five, originated four years before current fiscal year | 1,580 | 2,796
Amortized cost, originated more than five years before current fiscal year | 2,795 | 0
Mortgage loans, amortized cost | $ 35,367 | $ 34,843

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