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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Commercial Mortgage Loans    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 44,171 $ 425,875
Average LTV, year one, originated in current fiscal year 39.00% 59.00%
Amortized cost, originated in fiscal year before current fiscal year $ 520,651 $ 592,468
Average LTV, year two, originated in fiscal year before current fiscal year 53.00% 53.00%
Amortized cost, originated two years before current fiscal year $ 632,843 $ 486,339
Average LTV, year three, originated two years before current fiscal year 51.00% 58.00%
Amortized cost, originated three years before current fiscal year $ 435,768 $ 591,076
Average LTV, year four, originated three years before current fiscal year 52.00% 61.00%
Amortized cost, originated four years before current fiscal year $ 560,750 $ 416,132
Average LTV, year five, originated four years before current fiscal year 57.00% 57.00%
Amortized cost, originated more than five years before current fiscal year $ 1,350,816 $ 1,042,668
Average LTV, originated more than five years before current fiscal year 47.00% 47.00%
Mortgage loans, amortized cost $ 3,544,999 $ 3,554,558
Total - Average LTV 51.00% 54.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 3,444 $ 249,328
Average LTV, year one, originated in current fiscal year 46.00% 63.00%
Amortized cost, originated in fiscal year before current fiscal year $ 285,481 $ 257,746
Average LTV, year two, originated in fiscal year before current fiscal year 62.00% 61.00%
Amortized cost, originated two years before current fiscal year $ 272,661 $ 421,391
Average LTV, year three, originated two years before current fiscal year 57.00% 57.00%
Amortized cost, originated three years before current fiscal year $ 370,299 $ 429,596
Average LTV, year four, originated three years before current fiscal year 51.00% 58.00%
Amortized cost, originated four years before current fiscal year $ 449,973 $ 325,117
Average LTV, year five, originated four years before current fiscal year 55.00% 53.00%
Amortized cost, originated more than five years before current fiscal year $ 1,056,159 $ 813,319
Average LTV, originated more than five years before current fiscal year 44.00% 44.00%
Mortgage loans, amortized cost $ 2,438,017 $ 2,496,497
Total - Average LTV 50.00% 53.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 0 $ 6,488
Average LTV, year one, originated in current fiscal year 0.00% 70.00%
Amortized cost, originated in fiscal year before current fiscal year $ 76,122 $ 123,038
Average LTV, year two, originated in fiscal year before current fiscal year 49.00% 55.00%
Amortized cost, originated two years before current fiscal year $ 4,500 $ 46,804
Average LTV, year three, originated two years before current fiscal year 55.00% 58.00%
Amortized cost, originated three years before current fiscal year $ 36,534 $ 115,977
Average LTV, year four, originated three years before current fiscal year 57.00% 66.00%
Amortized cost, originated four years before current fiscal year $ 108,232 $ 67,642
Average LTV, year five, originated four years before current fiscal year 64.00% 67.00%
Amortized cost, originated more than five years before current fiscal year $ 177,489 $ 145,703
Average LTV, originated more than five years before current fiscal year 57.00% 60.00%
Mortgage loans, amortized cost $ 402,877 $ 505,652
Total - Average LTV 58.00% 62.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 40,727 $ 170,059
Average LTV, year one, originated in current fiscal year 38.00% 52.00%
Amortized cost, originated in fiscal year before current fiscal year $ 105,578 $ 211,684
Average LTV, year two, originated in fiscal year before current fiscal year 32.00% 43.00%
Amortized cost, originated two years before current fiscal year $ 328,722 $ 18,144
Average LTV, year three, originated two years before current fiscal year 45.00% 79.00%
Amortized cost, originated three years before current fiscal year $ 28,935 $ 39,396
Average LTV, year four, originated three years before current fiscal year 54.00% 73.00%
Amortized cost, originated four years before current fiscal year $ 0 $ 10,348
Average LTV, year five, originated four years before current fiscal year 0.00% 76.00%
Amortized cost, originated more than five years before current fiscal year $ 63,972 $ 58,021
Average LTV, originated more than five years before current fiscal year 71.00% 47.00%
Mortgage loans, amortized cost $ 567,934 $ 507,652
Total - Average LTV 46.00% 51.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 0 $ 0
Average LTV, year one, originated in current fiscal year 0.00% 0.00%
Amortized cost, originated in fiscal year before current fiscal year $ 53,470 $ 0
Average LTV, year two, originated in fiscal year before current fiscal year 54.00% 0.00%
Amortized cost, originated two years before current fiscal year $ 26,960 $ 0
Average LTV, year three, originated two years before current fiscal year 52.00% 0.00%
Amortized cost, originated three years before current fiscal year $ 0 $ 6,107
Average LTV, year four, originated three years before current fiscal year 0.00% 64.00%
Amortized cost, originated four years before current fiscal year $ 2,545 $ 13,025
Average LTV, year five, originated four years before current fiscal year 80.00% 70.00%
Amortized cost, originated more than five years before current fiscal year $ 53,196 $ 25,625
Average LTV, originated more than five years before current fiscal year 52.00% 65.00%
Mortgage loans, amortized cost $ 136,171 $ 44,757
Total - Average LTV 53.00% 66.00%
Agricultural Mortgage Loans    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 48,676 $ 196,347
Average LTV, year one, originated in current fiscal year 58.00% 51.00%
Amortized cost, originated in fiscal year before current fiscal year $ 192,677 $ 160,641
Average LTV, year two, originated in fiscal year before current fiscal year 51.00% 48.00%
Amortized cost, originated two years before current fiscal year $ 133,639 $ 169,346
Average LTV, year three, originated two years before current fiscal year 54.00% 37.00%
Amortized cost, originated three years before current fiscal year $ 168,500 $ 5,629
Average LTV, year four, originated three years before current fiscal year 44.00% 41.00%
Amortized cost, originated four years before current fiscal year $ 2,141 $ 34,000
Average LTV, year five, originated four years before current fiscal year 33.00% 31.00%
Amortized cost, originated more than five years before current fiscal year $ 34,000 $ 0
Average LTV, originated more than five years before current fiscal year 42.00% 0.00%
Mortgage loans, amortized cost $ 579,633 $ 565,963
Total - Average LTV 49.00% 45.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 26,890 $ 85,367
Average LTV, year one, originated in current fiscal year 59.00% 47.00%
Amortized cost, originated in fiscal year before current fiscal year $ 61,374 $ 84,186
Average LTV, year two, originated in fiscal year before current fiscal year 54.00% 46.00%
Amortized cost, originated two years before current fiscal year $ 46,060 $ 97,143
Average LTV, year three, originated two years before current fiscal year 57.00% 41.00%
Amortized cost, originated three years before current fiscal year $ 91,060 $ 0
Average LTV, year four, originated three years before current fiscal year 46.00% 0.00%
Amortized cost, originated four years before current fiscal year $ 0 $ 0
Average LTV, year five, originated four years before current fiscal year 0.00% 0.00%
Amortized cost, originated more than five years before current fiscal year $ 34,000 $ 0
Average LTV, originated more than five years before current fiscal year 42.00% 0.00%
Mortgage loans, amortized cost $ 259,384 $ 266,696
Total - Average LTV 50.00% 45.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 17,798 $ 107,856
Average LTV, year one, originated in current fiscal year 59.00% 54.00%
Amortized cost, originated in fiscal year before current fiscal year $ 89,548 $ 67,630
Average LTV, year two, originated in fiscal year before current fiscal year 54.00% 52.00%
Amortized cost, originated two years before current fiscal year $ 51,819 $ 61,103
Average LTV, year three, originated two years before current fiscal year 52.00% 32.00%
Amortized cost, originated three years before current fiscal year $ 27,433 $ 0
Average LTV, year four, originated three years before current fiscal year 32.00% 0.00%
Amortized cost, originated four years before current fiscal year $ 0 $ 0
Average LTV, year five, originated four years before current fiscal year 0.00% 0.00%
Amortized cost, originated more than five years before current fiscal year $ 0 $ 0
Average LTV, originated more than five years before current fiscal year 0.00% 0.00%
Mortgage loans, amortized cost $ 186,598 $ 236,589
Total - Average LTV 51.00% 48.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 3,988 $ 3,124
Average LTV, year one, originated in current fiscal year 43.00% 56.00%
Amortized cost, originated in fiscal year before current fiscal year $ 3,080 $ 8,825
Average LTV, year two, originated in fiscal year before current fiscal year 55.00% 38.00%
Amortized cost, originated two years before current fiscal year $ 9,246 $ 3,125
Average LTV, year three, originated two years before current fiscal year 57.00% 25.00%
Amortized cost, originated three years before current fiscal year $ 902 $ 0
Average LTV, year four, originated three years before current fiscal year 59.00% 0.00%
Amortized cost, originated four years before current fiscal year $ 0 $ 0
Average LTV, year five, originated four years before current fiscal year 0.00% 0.00%
Amortized cost, originated more than five years before current fiscal year $ 0 $ 0
Average LTV, originated more than five years before current fiscal year 0.00% 0.00%
Mortgage loans, amortized cost $ 17,216 $ 15,074
Total - Average LTV 53.00% 39.00%
Agricultural Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0    
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]    
Amortized cost, originated in current fiscal year $ 0 $ 0
Average LTV, year one, originated in current fiscal year 0.00% 0.00%
Amortized cost, originated in fiscal year before current fiscal year $ 38,675 $ 0
Average LTV, year two, originated in fiscal year before current fiscal year 37.00% 0.00%
Amortized cost, originated two years before current fiscal year $ 26,514 $ 7,975
Average LTV, year three, originated two years before current fiscal year 51.00% 35.00%
Amortized cost, originated three years before current fiscal year $ 49,105 $ 5,629
Average LTV, year four, originated three years before current fiscal year 48.00% 41.00%
Amortized cost, originated four years before current fiscal year $ 2,141 $ 34,000
Average LTV, year five, originated four years before current fiscal year 33.00% 31.00%
Amortized cost, originated more than five years before current fiscal year $ 0 $ 0
Average LTV, originated more than five years before current fiscal year 0.00% 0.00%
Mortgage loans, amortized cost $ 116,435 $ 47,604
Total - Average LTV 45.00% 33.00%