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Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 592,095	$ 543,991
Average LTV, year one, originated in current fiscal year	54.00%	65.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 534,839	$ 755,584
Average LTV, year two, originated in fiscal year before current fiscal year	61.00%	67.00%
Amortized cost, year three, originated two years before current fiscal year	$ 688,191	$ 527,670
Average LTV, year three, originated two years before current fiscal year	64.00%	64.00%
Amortized cost, year four, originated three years before current fiscal year	$ 459,451	$ 459,055
Average LTV, year four, originated three years before current fiscal year	60.00%	60.00%
Amortized cost, year five, originated four years before current fiscal year	$ 402,400	$ 411,834
Average LTV, year five, originated four years before current fiscal year	58.00%	55.00%
Amortized cost, originated more than five years before current fiscal year	$ 951,526	$ 880,754
Average LTV, originated more than five years before current fiscal year	47.00%	49.00%
Mortgage loans, amortized cost	$ 3,628,502	$ 3,578,888
Total - Average LTV	56.00%	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	$ 260,623	$ 364,574
Average LTV, year one, originated in current fiscal year	64.00%	63.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 454,828	$ 442,370
Average LTV, year two, originated in fiscal year before current fiscal year	60.00%	66.00%
Amortized cost, year three, originated two years before current fiscal year	$ 464,059	$ 399,193
Average LTV, year three, originated two years before current fiscal year	61.00%	62.00%
Amortized cost, year four, originated three years before current fiscal year	$ 344,170	$ 316,738
Average LTV, year four, originated three years before current fiscal year	58.00%	57.00%
Amortized cost, year five, originated four years before current fiscal year	$ 246,854	$ 359,321
Average LTV, year five, originated four years before current fiscal year	52.00%	54.00%
Amortized cost, originated more than five years before current fiscal year	$ 758,494	$ 715,706
Average LTV, originated more than five years before current fiscal year	45.00%	47.00%
Mortgage loans, amortized cost	$ 2,529,028	$ 2,597,902
Total - Average LTV	55.00%	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	$ 12,836	$ 161,779
Average LTV, year one, originated in current fiscal year	67.00%	66.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 58,960	$ 226,166
Average LTV, year two, originated in fiscal year before current fiscal year	66.00%	70.00%
Amortized cost, year three, originated two years before current fiscal year	$ 128,301	$ 124,267
Average LTV, year three, originated two years before current fiscal year	70.00%	72.00%
Amortized cost, year four, originated three years before current fiscal year	$ 89,293	$ 124,564
Average LTV, year four, originated three years before current fiscal year	66.00%	67.00%
Amortized cost, year five, originated four years before current fiscal year	$ 135,818	$ 52,513
Average LTV, year five, originated four years before current fiscal year	66.00%	62.00%
Amortized cost, originated more than five years before current fiscal year	$ 129,833	$ 111,690
Average LTV, originated more than five years before current fiscal year	57.00%	55.00%
Mortgage loans, amortized cost	$ 555,041	$ 800,979
Total - Average LTV	65.00%	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	$ 318,636	$ 17,638
Average LTV, year one, originated in current fiscal year	45.00%	82.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 17,762	$ 22,917
Average LTV, year two, originated in fiscal year before current fiscal year	82.00%	67.00%
Amortized cost, year three, originated two years before current fiscal year	$ 69,684	$ 2,769
Average LTV, year three, originated two years before current fiscal year	72.00%	71.00%
Amortized cost, year four, originated three years before current fiscal year	$ 11,937	$ 7,597
Average LTV, year four, originated three years before current fiscal year	75.00%	66.00%
Amortized cost, year five, originated four years before current fiscal year	$ 6,343	$ 0
Average LTV, year five, originated four years before current fiscal year	60.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 42,125	$ 32,327
Average LTV, originated more than five years before current fiscal year	58.00%	65.00%
Mortgage loans, amortized cost	$ 466,487	$ 83,248
Total - Average LTV	53.00%	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	$ 3,289	$ 64,131
Average LTV, year two, originated in fiscal year before current fiscal year	61.00%	58.00%
Amortized cost, year three, originated two years before current fiscal year	$ 26,147	$ 1,441
Average LTV, year three, originated two years before current fiscal year	63.00%	89.00%
Amortized cost, year four, originated three years before current fiscal year	$ 14,051	$ 10,156
Average LTV, year four, originated three years before current fiscal year	76.00%	80.00%
Amortized cost, year five, originated four years before current fiscal year	$ 13,385	$ 0
Average LTV, year five, originated four years before current fiscal year	73.00%	0.00%
Amortized cost, originated more than five years before current fiscal year	$ 21,074	$ 21,031
Average LTV, originated more than five years before current fiscal year	54.00%	60.00%
Mortgage loans, amortized cost	$ 77,946	$ 96,759
Total - Average LTV	65.00%	61.00%
Agricultural Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Amortized cost, year one, originated in current fiscal year	$ 165,764	$ 196,190
Average LTV, year one, originated in current fiscal year	54.00%	47.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 196,521	$ 23,983
Average LTV, year two, originated in fiscal year before current fiscal year	49.00%	42.00%
Amortized cost, year three, originated two years before current fiscal year	$ 19,714	$ 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	$ 406,999	$ 245,173
Total - Average LTV	48.00%	43.00%
Agricultural 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	$ 62,548	$ 78,631
Average LTV, year one, originated in current fiscal year	54.00%	52.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 80,919	$ 13,985
Average LTV, year two, originated in fiscal year before current fiscal year	56.00%	47.00%
Amortized cost, year three, originated two years before current fiscal year	$ 11,645	$ 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	$ 180,112	$ 117,616
Total - Average LTV	49.00%	43.00%
Agricultural 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	$ 95,738	$ 101,879
Average LTV, year one, originated in current fiscal year	55.00%	44.00%
Amortized cost, year two, originated in fiscal year before current fiscal year	$ 102,958	$ 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	$ 3,335	$ 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	$ 202,031	$ 105,304
Total - Average LTV	48.00%	44.00%
Agricultural 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	$ 7,478	$ 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	$ 4,092	$ 6,573
Average LTV, year two, originated in fiscal year before current fiscal year	36.00%	43.00%
Amortized cost, year three, originated two years before current fiscal year	$ 4,734	$ 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	$ 16,304	$ 10,786
Total - Average LTV	44.00%	41.00%
Agricultural 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	$ 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	$ 8,552	$ 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	$ 8,552	$ 11,467
Total - Average LTV	59.00%	48.00%

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