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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 94,924	$ 543,991
Average LTV, year one, originated in current fiscal year	68.00%	65.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 539,326	$ 755,584
Average LTV, year two, originated in fiscal year before current fiscal year	64.00%	67.00%
Amortized cost, year three, originated two years before current fiscal year	$ 753,362	$ 527,670
Average LTV, year three, originated two years before current fiscal year	66.00%	64.00%
Amortized cost, year four, originated three years before current fiscal year	$ 506,817	$ 459,055
Average LTV, year four, originated three years before current fiscal year	65.00%	60.00%
Amortized cost, year five, originated four years before current fiscal year	$ 448,100	$ 411,834
Average LTV, year five, originated four years before current fiscal year	60.00%	55.00%
Amortized cost, originated more than five years before current fiscal year	$ 1,115,941	$ 880,754
Average LTV, originated more than five years before current fiscal year	49.00%	49.00%
Mortgage loans, amortized cost	$ 3,458,470	$ 3,578,888
Total - Average LTV	59.00%	59.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 81,799	$ 364,574
Average LTV, year one, originated in current fiscal year	67.00%	63.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 429,215	$ 442,370
Average LTV, year two, originated in fiscal year before current fiscal year	63.00%	66.00%
Amortized cost, year three, originated two years before current fiscal year	$ 491,471	$ 399,193
Average LTV, year three, originated two years before current fiscal year	64.00%	62.00%
Amortized cost, year four, originated three years before current fiscal year	$ 420,279	$ 316,738
Average LTV, year four, originated three years before current fiscal year	63.00%	57.00%
Amortized cost, year five, originated four years before current fiscal year	$ 312,331	$ 359,321
Average LTV, year five, originated four years before current fiscal year	56.00%	54.00%
Amortized cost, originated more than five years before current fiscal year	$ 913,649	$ 715,706
Average LTV, originated more than five years before current fiscal year	48.00%	47.00%
Mortgage loans, amortized cost	$ 2,648,744	$ 2,597,902
Total - Average LTV	57.00%	57.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 13,125	$ 161,779
Average LTV, year one, originated in current fiscal year	69.00%	66.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 86,440	$ 226,166
Average LTV, year two, originated in fiscal year before current fiscal year	64.00%	70.00%
Amortized cost, year three, originated two years before current fiscal year	$ 204,354	$ 124,267
Average LTV, year three, originated two years before current fiscal year	69.00%	72.00%
Amortized cost, year four, originated three years before current fiscal year	$ 85,124	$ 124,564
Average LTV, year four, originated three years before current fiscal year	73.00%	67.00%
Amortized cost, year five, originated four years before current fiscal year	$ 122,666	$ 52,513
Average LTV, year five, originated four years before current fiscal year	67.00%	62.00%
Amortized cost, originated more than five years before current fiscal year	$ 145,080	$ 111,690
Average LTV, originated more than five years before current fiscal year	59.00%	55.00%
Mortgage loans, amortized cost	$ 656,789	$ 800,979
Total - Average LTV	66.00%	66.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 0	$ 17,638
Average LTV, year one, originated in current fiscal year	0.00%	82.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 23,671	$ 22,917
Average LTV, year two, originated in fiscal year before current fiscal year	78.00%	67.00%
Amortized cost, year three, originated two years before current fiscal year	$ 19,409	$ 2,769
Average LTV, year three, originated two years before current fiscal year	80.00%	71.00%
Amortized cost, year four, originated three years before current fiscal year	$ 0	$ 7,597
Average LTV, year four, originated three years before current fiscal year	0.00%	66.00%
Amortized cost, year five, originated four years before current fiscal year	$ 2,250	$ 0
Average LTV, year five, originated four years before current fiscal year	72.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 44,910	$ 32,327
Average LTV, originated more than five years before current fiscal year	58.00%	65.00%
Mortgage loans, amortized cost	$ 90,240	$ 83,248
Total - Average LTV	68.00%	69.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
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	$ 64,131
Average LTV, year two, originated in fiscal year before current fiscal year	0.00%	58.00%
Amortized cost, year three, originated two years before current fiscal year	$ 38,128	$ 1,441
Average LTV, year three, originated two years before current fiscal year	66.00%	89.00%
Amortized cost, year four, originated three years before current fiscal year	$ 1,414	$ 10,156
Average LTV, year four, originated three years before current fiscal year	87.00%	80.00%
Amortized cost, year five, originated four years before current fiscal year	$ 10,853	$ 0
Average LTV, year five, originated four years before current fiscal year	78.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 12,302	$ 21,031
Average LTV, originated more than five years before current fiscal year	49.00%	60.00%
Mortgage loans, amortized cost	$ 62,697	$ 96,759
Total - Average LTV	66.00%	61.00%
Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 30,416	$ 196,190
Average LTV, year one, originated in current fiscal year	45.00%	47.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 201,319	$ 23,983
Average LTV, year two, originated in fiscal year before current fiscal year	50.00%	42.00%
Amortized cost, year three, originated two years before current fiscal year	$ 19,984	$ 25,000
Average LTV, year three, originated two years before current fiscal year	45.00%	11.00%
Amortized cost, year four, originated three years before current fiscal year	$ 25,000	$ 0
Average LTV, year four, originated three years before current fiscal year	11.00%	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	$ 276,719	$ 245,173
Total - Average LTV	45.00%	43.00%
Agricultural | Debt Service Coverage Ratio: Greater Than or Equal to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 12,108	$ 78,631
Average LTV, year one, originated in current fiscal year	39.00%	52.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 84,764	$ 13,985
Average LTV, year two, originated in fiscal year before current fiscal year	57.00%	47.00%
Amortized cost, year three, originated two years before current fiscal year	$ 11,841	$ 25,000
Average LTV, year three, originated two years before current fiscal year	49.00%	11.00%
Amortized cost, year four, originated three years before current fiscal year	$ 25,000	$ 0
Average LTV, year four, originated three years before current fiscal year	11.00%	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	$ 133,713	$ 117,616
Total - Average LTV	46.00%	43.00%
Agricultural | Debt Service Coverage Ratio: Greater Than or Equal to 1.2 and Less Than 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 10,829	$ 101,879
Average LTV, year one, originated in current fiscal year	54.00%	44.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 103,764	$ 3,425
Average LTV, year two, originated in fiscal year before current fiscal year	43.00%	23.00%
Amortized cost, year three, originated two years before current fiscal year	$ 3,385	$ 0
Average LTV, year three, originated two years before current fiscal year	22.00%	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	$ 117,978	$ 105,304
Total - Average LTV	44.00%	44.00%
Agricultural | Debt Service Coverage Ratio: Greater Than or Equal to 1.0 and Less Than 1.2
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 7,479	$ 4,213
Average LTV, year one, originated in current fiscal year	44.00%	37.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 4,166	$ 6,573
Average LTV, year two, originated in fiscal year before current fiscal year	29.00%	43.00%
Amortized cost, year three, originated two years before current fiscal year	$ 4,758	$ 0
Average LTV, year three, originated two years before current fiscal year	50.00%	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	$ 16,403	$ 10,786
Total - Average LTV	44.00%	41.00%
Agricultural | Debt Service Coverage Ratio: Less Than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 0	$ 11,467
Average LTV, year one, originated in current fiscal year	0.00%	48.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 8,625	$ 0
Average LTV, year two, originated in fiscal year before current fiscal year	59.00%	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	$ 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	$ 8,625	$ 11,467
Total - Average LTV	59.00%	48.00%

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