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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Commercial Mortgage Loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Amortized cost, year one, originated in current fiscal year	$ 0	$ 44,171
Average LTV, year one, originated in current fiscal year	0.00%	39.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 30,600	$ 520,651
Average LTV, year two, originated in fiscal year before current fiscal year	35.00%	53.00%
Amortized cost, year three, originated two years before current fiscal year	$ 506,879	$ 632,843
Average LTV, year three, originated two years before current fiscal year	53.00%	51.00%
Amortized cost, year four, originated three years before current fiscal year	$ 631,863	$ 435,768
Average LTV, year four, originated three years before current fiscal year	51.00%	52.00%
Amortized cost, year five, originated four years before current fiscal year	$ 423,814	$ 560,750
Average LTV, year five, originated four years before current fiscal year	51.00%	57.00%
Amortized cost, originated more than five years before current fiscal year	$ 1,882,453	$ 1,350,816
Average LTV, originated more than five years before current fiscal year	50.00%	47.00%
Mortgage loans, amortized cost	$ 3,475,609	$ 3,544,999
Total - Average LTV	51.00%	51.00%
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, year one, originated in current fiscal year	$ 0	$ 3,444
Average LTV, year one, originated in current fiscal year	0.00%	46.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 3,456	$ 285,481
Average LTV, year two, originated in fiscal year before current fiscal year	46.00%	62.00%
Amortized cost, year three, originated two years before current fiscal year	$ 285,438	$ 272,661
Average LTV, year three, originated two years before current fiscal year	62.00%	57.00%
Amortized cost, year four, originated three years before current fiscal year	$ 271,985	$ 370,299
Average LTV, year four, originated three years before current fiscal year	57.00%	51.00%
Amortized cost, year five, originated four years before current fiscal year	$ 348,016	$ 449,973
Average LTV, year five, originated four years before current fiscal year	50.00%	55.00%
Amortized cost, originated more than five years before current fiscal year	$ 1,479,369	$ 1,056,159
Average LTV, originated more than five years before current fiscal year	47.00%	44.00%
Mortgage loans, amortized cost	$ 2,388,264	$ 2,438,017
Total - Average LTV	50.00%	50.00%
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, year one, originated in current fiscal year	$ 0	$ 0
Average LTV, year one, originated in current fiscal year	0.00%	0.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 0	$ 76,122
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	49.00%
Amortized cost, year three, originated two years before current fiscal year	$ 81,084	$ 4,500
Average LTV, year three, originated two years before current fiscal year	48.00%	55.00%
Amortized cost, year four, originated three years before current fiscal year	$ 4,453	$ 36,534
Average LTV, year four, originated three years before current fiscal year	54.00%	57.00%
Amortized cost, year five, originated four years before current fiscal year	$ 27,150	$ 108,232
Average LTV, year five, originated four years before current fiscal year	52.00%	64.00%
Amortized cost, originated more than five years before current fiscal year	$ 282,786	$ 177,489
Average LTV, originated more than five years before current fiscal year	60.00%	57.00%
Mortgage loans, amortized cost	$ 395,473	$ 402,877
Total - Average LTV	57.00%	58.00%
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, year one, originated in current fiscal year	$ 0	$ 40,727
Average LTV, year one, originated in current fiscal year	0.00%	38.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 27,144	$ 105,578
Average LTV, year two, originated in fiscal year before current fiscal year	33.00%	32.00%
Amortized cost, year three, originated two years before current fiscal year	$ 86,871	$ 328,722
Average LTV, year three, originated two years before current fiscal year	29.00%	45.00%
Amortized cost, year four, originated three years before current fiscal year	$ 328,457	$ 28,935
Average LTV, year four, originated three years before current fiscal year	45.00%	54.00%
Amortized cost, year five, originated four years before current fiscal year	$ 30,270	$ 0
Average LTV, year five, originated four years before current fiscal year	56.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 63,302	$ 63,972
Average LTV, originated more than five years before current fiscal year	71.00%	71.00%
Mortgage loans, amortized cost	$ 536,044	$ 567,934
Total - Average LTV	46.00%	46.00%
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, year one, originated in current fiscal year	$ 0	$ 0
Average LTV, year one, originated in current fiscal year	0.00%	0.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 0	$ 53,470
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	54.00%
Amortized cost, year three, originated two years before current fiscal year	$ 53,486	$ 26,960
Average LTV, year three, originated two years before current fiscal year	54.00%	52.00%
Amortized cost, year four, originated three years before current fiscal year	$ 26,968	$ 0
Average LTV, year four, originated three years before current fiscal year	52.00%	0.00%
Amortized cost, year five, originated four years before current fiscal year	$ 18,378	$ 2,545
Average LTV, year five, originated four years before current fiscal year	54.00%	80.00%
Amortized cost, originated more than five years before current fiscal year	$ 56,996	$ 53,196
Average LTV, originated more than five years before current fiscal year	63.00%	52.00%
Mortgage loans, amortized cost	$ 155,828	$ 136,171
Total - Average LTV	57.00%	53.00%
Agricultural Mortgage Loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Amortized cost, year one, originated in current fiscal year	$ 897	$ 48,676
Average LTV, year one, originated in current fiscal year	36.00%	58.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 48,608	$ 192,677
Average LTV, year two, originated in fiscal year before current fiscal year	58.00%	51.00%
Amortized cost, year three, originated two years before current fiscal year	$ 190,478	$ 133,639
Average LTV, year three, originated two years before current fiscal year	50.00%	54.00%
Amortized cost, year four, originated three years before current fiscal year	$ 132,286	$ 168,500
Average LTV, year four, originated three years before current fiscal year	53.00%	44.00%
Amortized cost, year five, originated four years before current fiscal year	$ 166,189	$ 2,141
Average LTV, year five, originated four years before current fiscal year	44.00%	33.00%
Amortized cost, originated more than five years before current fiscal year	$ 36,127	$ 34,000
Average LTV, originated more than five years before current fiscal year	41.00%	42.00%
Mortgage loans, amortized cost	$ 574,585	$ 579,633
Total - Average LTV	49.00%	49.00%
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, year one, originated in current fiscal year	$ 0	$ 26,890
Average LTV, year one, originated in current fiscal year	0.00%	59.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 26,865	$ 61,374
Average LTV, year two, originated in fiscal year before current fiscal year	59.00%	54.00%
Amortized cost, year three, originated two years before current fiscal year	$ 61,331	$ 46,060
Average LTV, year three, originated two years before current fiscal year	53.00%	57.00%
Amortized cost, year four, originated three years before current fiscal year	$ 45,598	$ 91,060
Average LTV, year four, originated three years before current fiscal year	56.00%	46.00%
Amortized cost, year five, originated four years before current fiscal year	$ 90,066	$ 0
Average LTV, year five, originated four years before current fiscal year	45.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 34,000	$ 34,000
Average LTV, originated more than five years before current fiscal year	42.00%	42.00%
Mortgage loans, amortized cost	$ 257,860	$ 259,384
Total - Average LTV	50.00%	50.00%
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, year one, originated in current fiscal year	$ 0	$ 17,798
Average LTV, year one, originated in current fiscal year	0.00%	59.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 17,755	$ 89,548
Average LTV, year two, originated in fiscal year before current fiscal year	59.00%	54.00%
Amortized cost, year three, originated two years before current fiscal year	$ 88,146	$ 51,819
Average LTV, year three, originated two years before current fiscal year	53.00%	52.00%
Amortized cost, year four, originated three years before current fiscal year	$ 51,510	$ 27,433
Average LTV, year four, originated three years before current fiscal year	51.00%	32.00%
Amortized cost, year five, originated four years before current fiscal year	$ 26,352	$ 0
Average LTV, year five, originated four years before current fiscal year	34.00%	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	$ 183,763	$ 186,598
Total - Average LTV	50.00%	51.00%
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, year one, originated in current fiscal year	$ 897	$ 3,988
Average LTV, year one, originated in current fiscal year	36.00%	43.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 3,988	$ 3,080
Average LTV, year two, originated in fiscal year before current fiscal year	43.00%	55.00%
Amortized cost, year three, originated two years before current fiscal year	$ 3,058	$ 9,246
Average LTV, year three, originated two years before current fiscal year	55.00%	57.00%
Amortized cost, year four, originated three years before current fiscal year	$ 9,224	$ 902
Average LTV, year four, originated three years before current fiscal year	57.00%	59.00%
Amortized cost, year five, originated four years before current fiscal year	$ 894	$ 0
Average LTV, year five, originated four years before current fiscal year	58.00%	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	$ 18,061	$ 17,216
Total - Average LTV	52.00%	53.00%
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, year one, originated in current fiscal year	$ 0	$ 0
Average LTV, year one, originated in current fiscal year	0.00%	0.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 0	$ 38,675
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	37.00%
Amortized cost, year three, originated two years before current fiscal year	$ 37,943	$ 26,514
Average LTV, year three, originated two years before current fiscal year	36.00%	51.00%
Amortized cost, year four, originated three years before current fiscal year	$ 25,954	$ 49,105
Average LTV, year four, originated three years before current fiscal year	50.00%	48.00%
Amortized cost, year five, originated four years before current fiscal year	$ 48,877	$ 2,141
Average LTV, year five, originated four years before current fiscal year	48.00%	33.00%
Amortized cost, originated more than five years before current fiscal year	$ 2,127	$ 0
Average LTV, originated more than five years before current fiscal year	33.00%	0.00%
Mortgage loans, amortized cost	$ 114,901	$ 116,435
Total - Average LTV	44.00%	45.00%

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