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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
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	$ 34,618	$ 425,875
Average LTV, year one, originated in current fiscal year	32.00%	59.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 500,624	$ 592,468
Average LTV, year two, originated in fiscal year before current fiscal year	53.00%	53.00%
Amortized cost, year three, originated two years before current fiscal year	$ 599,335	$ 486,339
Average LTV, year three, originated two years before current fiscal year	51.00%	58.00%
Amortized cost, year four, originated three years before current fiscal year	$ 475,500	$ 591,076
Average LTV, year four, originated three years before current fiscal year	53.00%	61.00%
Amortized cost, year five, originated four years before current fiscal year	$ 558,182	$ 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	$ 1,360,747	$ 1,042,668
Average LTV, originated more than five years before current fiscal year	47.00%	47.00%
Mortgage loans, amortized cost	$ 3,529,006	$ 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, year one, originated in current fiscal year	$ 0	$ 249,328
Average LTV, year one, originated in current fiscal year	0.00%	63.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 285,725	$ 257,746
Average LTV, year two, originated in fiscal year before current fiscal year	62.00%	61.00%
Amortized cost, year three, originated two years before current fiscal year	$ 273,012	$ 421,391
Average LTV, year three, originated two years before current fiscal year	57.00%	57.00%
Amortized cost, year four, originated three years before current fiscal year	$ 380,956	$ 429,596
Average LTV, year four, originated three years before current fiscal year	53.00%	58.00%
Amortized cost, year five, originated four years before current fiscal year	$ 461,587	$ 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	$ 1,098,330	$ 813,319
Average LTV, originated more than five years before current fiscal year	44.00%	44.00%
Mortgage loans, amortized cost	$ 2,499,610	$ 2,496,497
Total - Average LTV	51.00%	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, year one, originated in current fiscal year	$ 0	$ 6,488
Average LTV, year one, originated in current fiscal year	0.00%	70.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 0	$ 123,038
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	55.00%
Amortized cost, year three, originated two years before current fiscal year	$ 4,547	$ 46,804
Average LTV, year three, originated two years before current fiscal year	56.00%	58.00%
Amortized cost, year four, originated three years before current fiscal year	$ 55,321	$ 115,977
Average LTV, year four, originated three years before current fiscal year	54.00%	66.00%
Amortized cost, year five, originated four years before current fiscal year	$ 94,038	$ 67,642
Average LTV, year five, originated four years before current fiscal year	68.00%	67.00%
Amortized cost, originated more than five years before current fiscal year	$ 178,773	$ 145,703
Average LTV, originated more than five years before current fiscal year	58.00%	60.00%
Mortgage loans, amortized cost	$ 332,679	$ 505,652
Total - Average LTV	60.00%	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, year one, originated in current fiscal year	$ 34,618	$ 170,059
Average LTV, year one, originated in current fiscal year	32.00%	52.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 214,899	$ 211,684
Average LTV, year two, originated in fiscal year before current fiscal year	42.00%	43.00%
Amortized cost, year three, originated two years before current fiscal year	$ 321,776	$ 18,144
Average LTV, year three, originated two years before current fiscal year	45.00%	79.00%
Amortized cost, year four, originated three years before current fiscal year	$ 39,223	$ 39,396
Average LTV, year four, originated three years before current fiscal year	62.00%	73.00%
Amortized cost, year five, 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	$ 29,780	$ 58,021
Average LTV, originated more than five years before current fiscal year	69.00%	47.00%
Mortgage loans, amortized cost	$ 640,296	$ 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, 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	$ 0
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	0.00%
Amortized cost, year three, originated two years before current fiscal year	$ 0	$ 0
Average LTV, year three, originated two years before current fiscal year	0.00%	0.00%
Amortized cost, year four, 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, year five, originated four years before current fiscal year	$ 2,557	$ 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	$ 53,864	$ 25,625
Average LTV, originated more than five years before current fiscal year	53.00%	65.00%
Mortgage loans, amortized cost	$ 56,421	$ 44,757
Total - Average LTV	54.00%	66.00%
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	$ 48,826	$ 196,347
Average LTV, year one, originated in current fiscal year	58.00%	51.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 193,525	$ 160,641
Average LTV, year two, originated in fiscal year before current fiscal year	51.00%	48.00%
Amortized cost, year three, originated two years before current fiscal year	$ 135,888	$ 169,346
Average LTV, year three, originated two years before current fiscal year	54.00%	37.00%
Amortized cost, year four, originated three years before current fiscal year	$ 168,811	$ 5,629
Average LTV, year four, originated three years before current fiscal year	45.00%	41.00%
Amortized cost, year five, originated four years before current fiscal year	$ 2,263	$ 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	$ 583,313	$ 565,963
Total - Average LTV	50.00%	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, year one, originated in current fiscal year	$ 27,014	$ 85,367
Average LTV, year one, originated in current fiscal year	59.00%	47.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 86,511	$ 84,186
Average LTV, year two, originated in fiscal year before current fiscal year	46.00%	46.00%
Amortized cost, year three, originated two years before current fiscal year	$ 61,672	$ 97,143
Average LTV, year three, originated two years before current fiscal year	57.00%	41.00%
Amortized cost, year four, originated three years before current fiscal year	$ 100,768	$ 0
Average LTV, year four, originated three years before current fiscal year	45.00%	0.00%
Amortized cost, year five, 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	$ 275,965	$ 266,696
Total - Average LTV	49.00%	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, year one, originated in current fiscal year	$ 17,824	$ 107,856
Average LTV, year one, originated in current fiscal year	59.00%	54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 103,934	$ 67,630
Average LTV, year two, originated in fiscal year before current fiscal year	54.00%	52.00%
Amortized cost, year three, originated two years before current fiscal year	$ 65,543	$ 61,103
Average LTV, year three, originated two years before current fiscal year	53.00%	32.00%
Amortized cost, year four, originated three years before current fiscal year	$ 60,068	$ 0
Average LTV, year four, originated three years before current fiscal year	45.00%	0.00%
Amortized cost, year five, 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	$ 247,369	$ 236,589
Total - Average LTV	52.00%	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, year one, originated in current fiscal year	$ 3,988	$ 3,124
Average LTV, year one, originated in current fiscal year	43.00%	56.00%
Amortized cost, year two, 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, year three, originated two years before current fiscal year	$ 8,673	$ 3,125
Average LTV, year three, originated two years before current fiscal year	39.00%	25.00%
Amortized cost, year four, originated three years before current fiscal year	$ 0	$ 0
Average LTV, year four, originated three years before current fiscal year	0.00%	0.00%
Amortized cost, year five, 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	$ 15,741	$ 15,074
Total - Average LTV	43.00%	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, 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	$ 0
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	0.00%
Amortized cost, year three, originated two years before current fiscal year	$ 0	$ 7,975
Average LTV, year three, originated two years before current fiscal year	0.00%	35.00%
Amortized cost, year four, originated three years before current fiscal year	$ 7,975	$ 5,629
Average LTV, year four, originated three years before current fiscal year	40.00%	41.00%
Amortized cost, year five, originated four years before current fiscal year	$ 2,263	$ 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	$ 44,238	$ 47,604
Total - Average LTV	41.00%	33.00%

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