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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Commercial Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year $ 0 $ 44,171
Amortized cost, year two, originated in fiscal year before current fiscal year 30,600 520,651
Amortized cost, year three, originated two years before current fiscal year 506,879 632,843
Amortized cost, year four, originated three years before current fiscal year 631,863 435,768
Amortized cost, year five, originated four years before current fiscal year 423,814 560,750
Amortized cost, originated more than five years before current fiscal year 1,882,453 1,350,816
Mortgage loans, amortized cost 3,475,609 3,544,999
Commercial Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 0 44,171
Amortized cost, year two, originated in fiscal year before current fiscal year 30,600 520,651
Amortized cost, year three, originated two years before current fiscal year 506,879 632,843
Amortized cost, year four, originated three years before current fiscal year 631,863 435,768
Amortized cost, year five, originated four years before current fiscal year 423,814 560,750
Amortized cost, originated more than five years before current fiscal year 1,882,453 1,350,816
Mortgage loans, amortized cost 3,475,609 3,544,999
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 897 48,676
Amortized cost, year two, originated in fiscal year before current fiscal year 48,608 192,677
Amortized cost, year three, originated two years before current fiscal year 190,478 133,639
Amortized cost, year four, originated three years before current fiscal year 132,286 168,500
Amortized cost, year five, originated four years before current fiscal year 166,189 2,141
Amortized cost, originated more than five years before current fiscal year 36,127 34,000
Mortgage loans, amortized cost 574,585 579,633
Agricultural Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 897 48,676
Amortized cost, year two, originated in fiscal year before current fiscal year 48,608 182,273
Amortized cost, year three, originated two years before current fiscal year 190,478 131,448
Amortized cost, year four, originated three years before current fiscal year 130,102 168,500
Amortized cost, year five, originated four years before current fiscal year 166,189 2,141
Amortized cost, originated more than five years before current fiscal year 36,127 34,000
Mortgage loans, amortized cost 572,401 567,038
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 10,404
Amortized cost, year three, originated two years before current fiscal year 0 2,191
Amortized cost, year four, originated three years before current fiscal year 2,184 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 2,184 12,595
Residential Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 28,212 1,228,190
Amortized cost, year two, originated in fiscal year before current fiscal year 1,207,270 1,612,223
Amortized cost, year three, originated two years before current fiscal year 1,496,386 403,572
Amortized cost, year four, originated three years before current fiscal year 353,407 174,271
Amortized cost, year five, originated four years before current fiscal year 167,087 31,139
Amortized cost, originated more than five years before current fiscal year 21,288 1,702
Mortgage loans, amortized cost 3,273,650 3,451,097
Residential Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 28,212 1,183,248
Amortized cost, year two, originated in fiscal year before current fiscal year 1,169,009 1,493,165
Amortized cost, year three, originated two years before current fiscal year 1,415,122 365,704
Amortized cost, year four, originated three years before current fiscal year 326,677 161,426
Amortized cost, year five, originated four years before current fiscal year 152,853 22,654
Amortized cost, originated more than five years before current fiscal year 18,766 794
Mortgage loans, amortized cost 3,110,639 3,226,991
Residential Mortgage Loans | 30 - 59 days past due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 0 21,367
Amortized cost, year two, originated in fiscal year before current fiscal year 0 58,420
Amortized cost, year three, originated two years before current fiscal year 2,760 10,253
Amortized cost, year four, originated three years before current fiscal year 0 5,731
Amortized cost, year five, originated four years before current fiscal year 0 4,988
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost 2,760 100,759
Residential Mortgage Loans | 60 - 89 days past due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 0 5,017
Amortized cost, year two, originated in fiscal year before current fiscal year 12,381 22,383
Amortized cost, year three, originated two years before current fiscal year 26,227 3,908
Amortized cost, year four, originated three years before current fiscal year 3,765 1,839
Amortized cost, year five, originated four years before current fiscal year 5,079 99
Amortized cost, originated more than five years before current fiscal year 395 0
Mortgage loans, amortized cost 47,847 33,246
Residential Mortgage Loans | 90 days or more past due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 0 18,558
Amortized cost, year two, originated in fiscal year before current fiscal year 25,880 38,255
Amortized cost, year three, originated two years before current fiscal year 52,277 23,707
Amortized cost, year four, originated three years before current fiscal year 22,965 5,275
Amortized cost, year five, originated four years before current fiscal year 9,155 3,398
Amortized cost, originated more than five years before current fiscal year 2,127 908
Mortgage loans, amortized cost $ 112,404 $ 90,101