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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, 2022	Dec. 31, 2021
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	$ 391,127	$ 592,095
Average LTV, year one, originated in current fiscal year	60.00%	54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 593,951	$ 534,839
Average LTV, year two, originated in fiscal year before current fiscal year	53.00%	61.00%
Amortized cost, year three, originated two years before current fiscal year	$ 488,719	$ 688,191
Average LTV, year three, originated two years before current fiscal year	58.00%	64.00%
Amortized cost, year four, originated three years before current fiscal year	$ 601,991	$ 459,451
Average LTV, year four, originated three years before current fiscal year	61.00%	60.00%
Amortized cost, year five, originated four years before current fiscal year	$ 431,078	$ 402,400
Average LTV, year five, originated four years before current fiscal year	58.00%	58.00%
Amortized cost, originated more than five years before current fiscal year	$ 1,076,726	$ 951,526
Average LTV, originated more than five years before current fiscal year	47.00%	47.00%
Mortgage loans, amortized cost	$ 3,583,592	$ 3,628,502
Total - Average LTV	55.00%	56.00%
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	$ 231,027	$ 260,623
Average LTV, year one, originated in current fiscal year	64.00%	64.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 258,232	$ 454,828
Average LTV, year two, originated in fiscal year before current fiscal year	61.00%	60.00%
Amortized cost, year three, originated two years before current fiscal year	$ 441,541	$ 464,059
Average LTV, year three, originated two years before current fiscal year	57.00%	61.00%
Amortized cost, year four, originated three years before current fiscal year	$ 439,473	$ 344,170
Average LTV, year four, originated three years before current fiscal year	59.00%	58.00%
Amortized cost, year five, originated four years before current fiscal year	$ 333,748	$ 246,854
Average LTV, year five, originated four years before current fiscal year	54.00%	52.00%
Amortized cost, originated more than five years before current fiscal year	$ 840,846	$ 758,494
Average LTV, originated more than five years before current fiscal year	45.00%	45.00%
Mortgage loans, amortized cost	$ 2,544,867	$ 2,529,028
Total - Average LTV	54.00%	55.00%
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	$ 6,486	$ 12,836
Average LTV, year one, originated in current fiscal year	70.00%	67.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 124,082	$ 58,960
Average LTV, year two, originated in fiscal year before current fiscal year	56.00%	66.00%
Amortized cost, year three, originated two years before current fiscal year	$ 28,910	$ 128,301
Average LTV, year three, originated two years before current fiscal year	61.00%	70.00%
Amortized cost, year four, originated three years before current fiscal year	$ 116,762	$ 89,293
Average LTV, year four, originated three years before current fiscal year	67.00%	66.00%
Amortized cost, year five, originated four years before current fiscal year	$ 73,807	$ 135,818
Average LTV, year five, originated four years before current fiscal year	69.00%	66.00%
Amortized cost, originated more than five years before current fiscal year	$ 147,784	$ 129,833
Average LTV, originated more than five years before current fiscal year	60.00%	57.00%
Mortgage loans, amortized cost	$ 497,831	$ 555,041
Total - Average LTV	62.00%	65.00%
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	$ 100,177	$ 318,636
Average LTV, year one, originated in current fiscal year	52.00%	45.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 211,637	$ 17,762
Average LTV, year two, originated in fiscal year before current fiscal year	43.00%	82.00%
Amortized cost, year three, originated two years before current fiscal year	$ 18,268	$ 69,684
Average LTV, year three, originated two years before current fiscal year	80.00%	72.00%
Amortized cost, year four, originated three years before current fiscal year	$ 39,603	$ 11,937
Average LTV, year four, originated three years before current fiscal year	74.00%	75.00%
Amortized cost, year five, originated four years before current fiscal year	$ 10,404	$ 6,343
Average LTV, year five, originated four years before current fiscal year	76.00%	60.00%
Amortized cost, originated more than five years before current fiscal year	$ 60,019	$ 42,125
Average LTV, originated more than five years before current fiscal year	47.00%	58.00%
Mortgage loans, amortized cost	$ 440,108	$ 466,487
Total - Average LTV	51.00%	53.00%
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	$ 53,437	$ 0
Average LTV, year one, originated in current fiscal year	54.00%	0.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 0	$ 3,289
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	61.00%
Amortized cost, year three, originated two years before current fiscal year	$ 0	$ 26,147
Average LTV, year three, originated two years before current fiscal year	0.00%	63.00%
Amortized cost, year four, originated three years before current fiscal year	$ 6,153	$ 14,051
Average LTV, year four, originated three years before current fiscal year	61.00%	76.00%
Amortized cost, year five, originated four years before current fiscal year	$ 13,119	$ 13,385
Average LTV, year five, originated four years before current fiscal year	73.00%	73.00%
Amortized cost, originated more than five years before current fiscal year	$ 28,077	$ 21,074
Average LTV, originated more than five years before current fiscal year	67.00%	54.00%
Mortgage loans, amortized cost	$ 100,786	$ 77,946
Total - Average LTV	61.00%	65.00%
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	$ 188,916	$ 165,764
Average LTV, year one, originated in current fiscal year	52.00%	54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 158,513	$ 196,521
Average LTV, year two, originated in fiscal year before current fiscal year	53.00%	49.00%
Amortized cost, year three, originated two years before current fiscal year	$ 193,598	$ 19,714
Average LTV, year three, originated two years before current fiscal year	53.00%	45.00%
Amortized cost, year four, originated three years before current fiscal year	$ 5,768	$ 25,000
Average LTV, year four, originated three years before current fiscal year	24.00%	11.00%
Amortized cost, year five, originated four years before current fiscal year	$ 34,000	$ 0
Average LTV, year five, originated four years before current fiscal year	42.00%	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	$ 580,795	$ 406,999
Total - Average LTV	52.00%	48.00%
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	$ 85,660	$ 62,548
Average LTV, year one, originated in current fiscal year	48.00%	54.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 54,509	$ 80,919
Average LTV, year two, originated in fiscal year before current fiscal year	51.00%	56.00%
Amortized cost, year three, originated two years before current fiscal year	$ 83,847	$ 11,645
Average LTV, year three, originated two years before current fiscal year	67.00%	49.00%
Amortized cost, year four, originated three years before current fiscal year	$ 1,421	$ 25,000
Average LTV, year four, originated three years before current fiscal year	42.00%	11.00%
Amortized cost, year five, originated four years before current fiscal year	$ 34,000	$ 0
Average LTV, year five, originated four years before current fiscal year	42.00%	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	$ 259,437	$ 180,112
Total - Average LTV	54.00%	49.00%
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	$ 96,443	$ 95,738
Average LTV, year one, originated in current fiscal year	54.00%	55.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 96,648	$ 102,958
Average LTV, year two, originated in fiscal year before current fiscal year	54.00%	43.00%
Amortized cost, year three, originated two years before current fiscal year	$ 99,008	$ 3,335
Average LTV, year three, originated two years before current fiscal year	42.00%	22.00%
Amortized cost, year four, originated three years before current fiscal year	$ 4,347	$ 0
Average LTV, year four, originated three years before current fiscal year	18.00%	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	$ 296,446	$ 202,031
Total - Average LTV	50.00%	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	$ 6,813	$ 7,478
Average LTV, year one, originated in current fiscal year	74.00%	44.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 7,356	$ 4,092
Average LTV, year two, originated in fiscal year before current fiscal year	43.00%	36.00%
Amortized cost, year three, originated two years before current fiscal year	$ 4,042	$ 4,734
Average LTV, year three, originated two years before current fiscal year	36.00%	50.00%
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	$ 18,211	$ 16,304
Total - Average LTV	53.00%	44.00%
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	$ 8,552
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	59.00%
Amortized cost, year three, originated two years before current fiscal year	$ 6,701	$ 0
Average LTV, year three, originated two years before current fiscal year	46.00%	0.00%
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	$ 6,701	$ 8,552
Total - Average LTV	46.00%	59.00%

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