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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
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