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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($) $ in Thousands | Sep. 30, 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 | $ 34,618 | $ 425,875
Amortized cost, year two, originated in fiscal year before current fiscal year | 500,624 | 592,468
Amortized cost, year three, originated two years before current fiscal year | 599,335 | 486,339
Amortized cost, year four, originated three years before current fiscal year | 475,500 | 591,076
Amortized cost, year five, originated four years before current fiscal year | 558,182 | 416,132
Amortized cost, originated more than five years before current fiscal year | 1,360,747 | 1,042,668
Mortgage loans, amortized cost | 3,529,006 | 3,554,558
Commercial Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 34,618 | 425,875
Amortized cost, year two, originated in fiscal year before current fiscal year | 500,624 | 592,468
Amortized cost, year three, originated two years before current fiscal year | 599,335 | 486,339
Amortized cost, year four, originated three years before current fiscal year | 475,500 | 591,076
Amortized cost, year five, originated four years before current fiscal year | 558,182 | 416,132
Amortized cost, originated more than five years before current fiscal year | 1,360,747 | 1,042,668
Mortgage loans, amortized cost | 3,529,006 | 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 | 90 days or more 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 | 48,826 | 196,347
Amortized cost, year two, originated in fiscal year before current fiscal year | 193,525 | 160,641
Amortized cost, year three, originated two years before current fiscal year | 135,888 | 169,346
Amortized cost, year four, originated three years before current fiscal year | 168,811 | 5,629
Amortized cost, year five, originated four years before current fiscal year | 2,263 | 34,000
Amortized cost, originated more than five years before current fiscal year | 34,000 | 0
Mortgage loans, amortized cost | 583,313 | 565,963
Agricultural Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 48,826 | 196,347
Amortized cost, year two, originated in fiscal year before current fiscal year | 193,525 | 160,641
Amortized cost, year three, originated two years before current fiscal year | 135,888 | 166,211
Amortized cost, year four, originated three years before current fiscal year | 168,811 | 5,629
Amortized cost, year five, originated four years before current fiscal year | 2,263 | 34,000
Amortized cost, originated more than five years before current fiscal year | 34,000 | 0
Mortgage loans, amortized cost | 583,313 | 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 | 90 days or more 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 | 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 | 0 | 3,135
Residential Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 1,018,107 | 1,970,718
Amortized cost, year two, originated in fiscal year before current fiscal year | 1,736,056 | 624,834
Amortized cost, year three, originated two years before current fiscal year | 457,986 | 233,741
Amortized cost, year four, originated three years before current fiscal year | 180,495 | 31,262
Amortized cost, year five, originated four years before current fiscal year | 30,806 | 4,506
Amortized cost, originated more than five years before current fiscal year | 4,296 | 417
Mortgage loans, amortized cost | 3,427,746 | 2,865,478
Residential Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 975,966 | 1,915,169
Amortized cost, year two, originated in fiscal year before current fiscal year | 1,639,242 | 595,363
Amortized cost, year three, originated two years before current fiscal year | 411,035 | 211,119
Amortized cost, year four, originated three years before current fiscal year | 167,678 | 27,483
Amortized cost, year five, originated four years before current fiscal year | 27,309 | 1,710
Amortized cost, originated more than five years before current fiscal year | 893 | 417
Mortgage loans, amortized cost | 3,222,123 | 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 | 30,963 | 39,179
Amortized cost, year two, originated in fiscal year before current fiscal year | 36,240 | 8,238
Amortized cost, year three, originated two years before current fiscal year | 15,604 | 13,073
Amortized cost, year four, originated three years before current fiscal year | 6,560 | 1,960
Amortized cost, year five, originated four years before current fiscal year | 99 | 0
Amortized cost, originated more than five years before current fiscal year | 0 | 0
Mortgage loans, amortized cost | 89,466 | 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 | 3,007 | 6,668
Amortized cost, year two, originated in fiscal year before current fiscal year | 21,436 | 7,165
Amortized cost, year three, originated two years before current fiscal year | 4,233 | 3,034
Amortized cost, year four, originated three years before current fiscal year | 888 | 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 | 29,564 | 16,924
Residential Mortgage Loans | 90 days or more past due |  |
Financing Receivable, Past Due [Line Items] |  |
Amortized cost, year one, originated in current fiscal year | 8,171 | 9,702
Amortized cost, year two, originated in fiscal year before current fiscal year | 39,138 | 14,068
Amortized cost, year three, originated two years before current fiscal year | 27,114 | 6,515
Amortized cost, year four, originated three years before current fiscal year | 5,369 | 1,762
Amortized cost, year five, originated four years before current fiscal year | 3,398 | 2,796
Amortized cost, originated more than five years before current fiscal year | 3,403 | 0
Mortgage loans, amortized cost | $ 86,593 | $ 34,843

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