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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, 2021	Dec. 31, 2020
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, originated in current fiscal year	$ 54,134	$ 543,991
Average LTV, originated in current fiscal year	67.00%	65.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 541,611	$ 755,584
Average LTV, originated in fiscal year before latest fiscal year	64.00%	67.00%
Amortized cost, originated two years before latest fiscal year	$ 754,416	$ 527,670
Average LTV, originated two years before latest fiscal year	66.00%	64.00%
Amortized cost, originated three years before latest fiscal year	$ 511,189	$ 459,055
Average LTV, originated three years before latest fiscal year	65.00%	60.00%
Amortized cost, originated four years before latest fiscal year	$ 455,370	$ 411,834
Average LTV, originated four years before latest fiscal year	60.00%	55.00%
Amortized cost, originated five or more years before latest fiscal year	$ 1,229,207	$ 880,754
Average LTV, originated five or more years before latest fiscal year	50.00%	49.00%
Amortized cost	$ 3,545,927	$ 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, originated in current fiscal year	$ 40,908	$ 364,574
Average LTV, originated in current fiscal year	66.00%	63.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 393,845	$ 442,370
Average LTV, originated in fiscal year before latest fiscal year	63.00%	66.00%
Amortized cost, originated two years before latest fiscal year	$ 496,170	$ 399,193
Average LTV, originated two years before latest fiscal year	65.00%	62.00%
Amortized cost, originated three years before latest fiscal year	$ 412,055	$ 316,738
Average LTV, originated three years before latest fiscal year	64.00%	57.00%
Amortized cost, originated four years before latest fiscal year	$ 314,347	$ 359,321
Average LTV, originated four years before latest fiscal year	57.00%	54.00%
Amortized cost, originated five or more years before latest fiscal year	$ 1,017,700	$ 715,706
Average LTV, originated five or more years before latest fiscal year	48.00%	47.00%
Amortized cost	$ 2,675,025	$ 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, originated in current fiscal year	$ 13,226	$ 161,779
Average LTV, originated in current fiscal year	69.00%	66.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 130,276	$ 226,166
Average LTV, originated in fiscal year before latest fiscal year	67.00%	70.00%
Amortized cost, originated two years before latest fiscal year	$ 212,153	$ 124,267
Average LTV, originated two years before latest fiscal year	70.00%	72.00%
Amortized cost, originated three years before latest fiscal year	$ 94,962	$ 124,564
Average LTV, originated three years before latest fiscal year	73.00%	67.00%
Amortized cost, originated four years before latest fiscal year	$ 123,465	$ 52,513
Average LTV, originated four years before latest fiscal year	67.00%	62.00%
Amortized cost, originated five or more years before latest fiscal year	$ 162,707	$ 111,690
Average LTV, originated five or more years before latest fiscal year	57.00%	55.00%
Amortized cost	$ 736,789	$ 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, originated in current fiscal year	$ 0	$ 17,638
Average LTV, originated in current fiscal year	0.00%	82.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 17,490	$ 22,917
Average LTV, originated in fiscal year before latest fiscal year	81.00%	67.00%
Amortized cost, originated two years before latest fiscal year	$ 8,958	$ 2,769
Average LTV, originated two years before latest fiscal year	68.00%	71.00%
Amortized cost, originated three years before latest fiscal year	$ 2,744	$ 7,597
Average LTV, originated three years before latest fiscal year	70.00%	66.00%
Amortized cost, originated four years before latest fiscal year	$ 7,495	$ 0
Average LTV, originated four years before latest fiscal year	65.00%	0.00%
Amortized cost, originated five or more years before latest fiscal year	$ 28,608	$ 32,327
Average LTV, originated five or more years before latest fiscal year	63.00%	65.00%
Amortized cost	$ 65,295	$ 83,248
Total - Average LTV	69.00%	69.00%
Commercial Mortgage Loans | Debt Service Coverage Ratio: Less Than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, originated in current fiscal year	$ 0	$ 0
Average LTV, originated in current fiscal year	0.00%	0.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 0	$ 64,131
Average LTV, originated in fiscal year before latest fiscal year	0.00%	58.00%
Amortized cost, originated two years before latest fiscal year	$ 37,135	$ 1,441
Average LTV, originated two years before latest fiscal year	65.00%	89.00%
Amortized cost, originated three years before latest fiscal year	$ 1,428	$ 10,156
Average LTV, originated three years before latest fiscal year	88.00%	80.00%
Amortized cost, originated four years before latest fiscal year	$ 10,063	$ 0
Average LTV, originated four years before latest fiscal year	80.00%	0.00%
Amortized cost, originated five or more years before latest fiscal year	$ 20,192	$ 21,031
Average LTV, originated five or more years before latest fiscal year	61.00%	60.00%
Amortized cost	$ 68,818	$ 96,759
Total - Average LTV	66.00%	61.00%
Agricultural
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, originated in current fiscal year	$ 23,355	$ 196,190
Average LTV, originated in current fiscal year	43.00%	47.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 197,147	$ 23,983
Average LTV, originated in fiscal year before latest fiscal year	48.00%	42.00%
Amortized cost, originated two years before latest fiscal year	$ 20,083	$ 25,000
Average LTV, originated two years before latest fiscal year	45.00%	11.00%
Amortized cost, originated three years before latest fiscal year	$ 25,000	$ 0
Average LTV, originated three years before latest fiscal year	11.00%	0.00%
Amortized cost, originated four years before latest fiscal year	$ 0	$ 0
Average LTV, originated four years before latest fiscal year	0.00%	0.00%
Amortized cost, originated five or more years before latest fiscal year	$ 0	$ 0
Average LTV, originated five or more years before latest fiscal year	0.00%	0.00%
Amortized cost	$ 265,585	$ 245,173
Total - Average LTV	44.00%	43.00%
Agricultural | Debt Service Coverage Ratio: Greater Than or Equal to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, originated in current fiscal year	$ 12,128	$ 78,631
Average LTV, originated in current fiscal year	39.00%	52.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 80,175	$ 13,985
Average LTV, originated in fiscal year before latest fiscal year	53.00%	47.00%
Amortized cost, originated two years before latest fiscal year	$ 11,901	$ 25,000
Average LTV, originated two years before latest fiscal year	49.00%	11.00%
Amortized cost, originated three years before latest fiscal year	$ 25,000	$ 0
Average LTV, originated three years before latest fiscal year	11.00%	0.00%
Amortized cost, originated four years before latest fiscal year	$ 0	$ 0
Average LTV, originated four years before latest fiscal year	0.00%	0.00%
Amortized cost, originated five or more years before latest fiscal year	$ 0	$ 0
Average LTV, originated five or more years before latest fiscal year	0.00%	0.00%
Amortized cost	$ 129,204	$ 117,616
Total - Average LTV	43.00%	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, originated in current fiscal year	$ 3,748	$ 101,879
Average LTV, originated in current fiscal year	57.00%	44.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 104,090	$ 3,425
Average LTV, originated in fiscal year before latest fiscal year	43.00%	23.00%
Amortized cost, originated two years before latest fiscal year	$ 3,401	$ 0
Average LTV, originated two years before latest fiscal year	23.00%	0.00%
Amortized cost, originated three years before latest fiscal year	$ 0	$ 0
Average LTV, originated three years before latest fiscal year	0.00%	0.00%
Amortized cost, originated four years before latest fiscal year	$ 0	$ 0
Average LTV, originated four years before latest fiscal year	0.00%	0.00%
Amortized cost, originated five or more years before latest fiscal year	$ 0	$ 0
Average LTV, originated five or more years before latest fiscal year	0.00%	0.00%
Amortized cost	$ 111,239	$ 105,304
Total - Average LTV	43.00%	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, originated in current fiscal year	$ 7,479	$ 4,213
Average LTV, originated in current fiscal year	44.00%	37.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 4,186	$ 6,573
Average LTV, originated in fiscal year before latest fiscal year	37.00%	43.00%
Amortized cost, originated two years before latest fiscal year	$ 4,781	$ 0
Average LTV, originated two years before latest fiscal year	50.00%	0.00%
Amortized cost, originated three years before latest fiscal year	$ 0	$ 0
Average LTV, originated three years before latest fiscal year	0.00%	0.00%
Amortized cost, originated four years before latest fiscal year	$ 0	$ 0
Average LTV, originated four years before latest fiscal year	0.00%	0.00%
Amortized cost, originated five or more years before latest fiscal year	$ 0	$ 0
Average LTV, originated five or more years before latest fiscal year	0.00%	0.00%
Amortized cost	$ 16,446	$ 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, originated in current fiscal year	$ 0	$ 11,467
Average LTV, originated in current fiscal year	0.00%	48.00%
Amortized cost, originated in fiscal year before latest fiscal year	$ 8,696	$ 0
Average LTV, originated in fiscal year before latest fiscal year	60.00%	0.00%
Amortized cost, originated two years before latest fiscal year	$ 0	$ 0
Average LTV, originated two years before latest fiscal year	0.00%	0.00%
Amortized cost, originated three years before latest fiscal year	$ 0	$ 0
Average LTV, originated three years before latest fiscal year	0.00%	0.00%
Amortized cost, originated four years before latest fiscal year	$ 0	$ 0
Average LTV, originated four years before latest fiscal year	0.00%	0.00%
Amortized cost, originated five or more years before latest fiscal year	$ 0	$ 0
Average LTV, originated five or more years before latest fiscal year	0.00%	0.00%
Amortized cost	$ 8,696	$ 11,467
Total - Average LTV	60.00%	48.00%

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