Mortgage Loans on Real Estate (Summary By Debt Service Coverage and Loan to Value Ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Commercial Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2020 - Amortized cost	$ 543,991
2020 - Average LTV	65.00%
2019 - Amortized cost	$ 755,584
2019 - Average LTV	67.00%
2018 - Amortized cost	$ 527,670
2018 - Average LTV	64.00%
2017 - Amortized cost	$ 459,055
2017 - Average LTV	60.00%
2016 - Amortized cost	$ 411,834
2016 - Average LTV	55.00%
Prior - Amortized cost	$ 880,754
Prior - Average LTV	49.00%
Amortized cost	$ 3,578,888	$ 3,406,712
Total - Average LTV	59.00%
Commercial Mortgage Loans \| Debt Service Coverage Ratio: Greater Than or Equal to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
2020 - Amortized cost	$ 364,574
2020 - Average LTV	63.00%
2019 - Amortized cost	$ 442,370
2019 - Average LTV	66.00%
2018 - Amortized cost	$ 399,193
2018 - Average LTV	62.00%
2017 - Amortized cost	$ 316,738
2017 - Average LTV	57.00%
2016 - Amortized cost	$ 359,321
2016 - Average LTV	54.00%
Prior - Amortized cost	$ 715,706
Prior - Average LTV	47.00%
Amortized cost	$ 2,597,902
Total - Average LTV	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]
2020 - Amortized cost	$ 161,779
2020 - Average LTV	66.00%
2019 - Amortized cost	$ 226,166
2019 - Average LTV	70.00%
2018 - Amortized cost	$ 124,267
2018 - Average LTV	72.00%
2017 - Amortized cost	$ 124,564
2017 - Average LTV	67.00%
2016 - Amortized cost	$ 52,513
2016 - Average LTV	62.00%
Prior - Amortized cost	$ 111,690
Prior - Average LTV	55.00%
Amortized cost	$ 800,979
Total - Average LTV	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]
2020 - Amortized cost	$ 17,638
2020 - Average LTV	82.00%
2019 - Amortized cost	$ 22,917
2019 - Average LTV	67.00%
2018 - Amortized cost	$ 2,769
2018 - Average LTV	71.00%
2017 - Amortized cost	$ 7,597
2017 - Average LTV	66.00%
2016 - Amortized cost	$ 0
2016 - Average LTV	0.00%
Prior - Amortized cost	$ 32,327
Prior - Average LTV	65.00%
Amortized cost	$ 83,248
Total - Average LTV	69.00%
Commercial Mortgage Loans \| Debt Service Coverage Ratio: Less Than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
2020 - Amortized cost	$ 0
2020 - Average LTV	0.00%
2019 - Amortized cost	$ 64,131
2019 - Average LTV	58.00%
2018 - Amortized cost	$ 1,441
2018 - Average LTV	89.00%
2017 - Amortized cost	$ 10,156
2017 - Average LTV	80.00%
2016 - Amortized cost	$ 0
2016 - Average LTV	0.00%
Prior - Amortized cost	$ 21,031
Prior - Average LTV	60.00%
Amortized cost	$ 96,759
Total - Average LTV	61.00%
Agricultural Mortgage Loans
Financing Receivable, Credit Quality Indicator [Line Items]
2020 - Amortized cost	$ 196,190
2020 - Average LTV	47.00%
2019 - Amortized cost	$ 23,983
2019 - Average LTV	42.00%
2018 - Amortized cost	$ 25,000
2018 - Average LTV	11.00%
2017 - Amortized cost	$ 0
2017 - Average LTV	0.00%
2016 - Amortized cost	$ 0
2016 - Average LTV	0.00%
Prior - Amortized cost	$ 0
Prior - Average LTV	0.00%
Amortized cost	$ 245,173	$ 51,260
Total - Average LTV	43.00%
Agricultural Mortgage Loans \| Debt Service Coverage Ratio: Greater Than or Equal to 1.5
Financing Receivable, Credit Quality Indicator [Line Items]
2020 - Amortized cost	$ 78,631
2020 - Average LTV	52.00%
2019 - Amortized cost	$ 13,985
2019 - Average LTV	47.00%
2018 - Amortized cost	$ 25,000
2018 - Average LTV	11.00%
2017 - Amortized cost	$ 0
2017 - Average LTV	0.00%
2016 - Amortized cost	$ 0
2016 - Average LTV	0.00%
Prior - Amortized cost	$ 0
Prior - Average LTV	0.00%
Amortized cost	$ 117,616
Total - Average LTV	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]
2020 - Amortized cost	$ 101,879
2020 - Average LTV	44.00%
2019 - Amortized cost	$ 3,425
2019 - Average LTV	23.00%
2018 - Amortized cost	$ 0
2018 - Average LTV	0.00%
2017 - Amortized cost	$ 0
2017 - Average LTV	0.00%
2016 - Amortized cost	$ 0
2016 - Average LTV	0.00%
Prior - Amortized cost	$ 0
Prior - Average LTV	0.00%
Amortized cost	$ 105,304
Total - Average LTV	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]
2020 - Amortized cost	$ 4,213
2020 - Average LTV	37.00%
2019 - Amortized cost	$ 6,573
2019 - Average LTV	43.00%
2018 - Amortized cost	$ 0
2018 - Average LTV	0.00%
2017 - Amortized cost	$ 0
2017 - Average LTV	0.00%
2016 - Amortized cost	$ 0
2016 - Average LTV	0.00%
Prior - Amortized cost	$ 0
Prior - Average LTV	0.00%
Amortized cost	$ 10,786
Total - Average LTV	41.00%
Agricultural Mortgage Loans \| Debt Service Coverage Ratio: Less Than 1.0
Financing Receivable, Credit Quality Indicator [Line Items]
2020 - Amortized cost	$ 11,467
2020 - Average LTV	48.00%
2019 - Amortized cost	$ 0
2019 - Average LTV	0.00%
2018 - Amortized cost	$ 0
2018 - Average LTV	0.00%
2017 - Amortized cost	$ 0
2017 - Average LTV	0.00%
2016 - Amortized cost	$ 0
2016 - Average LTV	0.00%
Prior - Amortized cost	$ 0
Prior - Average LTV	0.00%
Amortized cost	$ 11,467
Total - Average LTV	48.00%

Financing Receivable, Originated Five or More Years before Latest Fiscal Year, Average Loan To Value, Percentage

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Financing Receivable, Originated Four Years before Latest Fiscal Year, Average Loan To Value, Percentage

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Financing Receivable, Originated Two Years before Latest Fiscal Year, Average Loan To Value, Percentage

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- Definition

Financing Receivable, Originated in Current Fiscal Year, Average Loan To Value, Percentage

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- Definition

Financing Receivable, after Deferred Income Offset, Average Loan To Value, Percentage

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- Definition

Amount, after fee received for commitment to originate or purchase, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

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Amount of financing receivable originated five or more years prior to latest fiscal year.

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Amount of financing receivable originated four years prior to latest fiscal year.

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Amount of financing receivable originated in current fiscal year.

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Amount of financing receivable originated in fiscal year prior to latest fiscal year.

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Amount of financing receivable originated three years prior to latest fiscal year.

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Amount of financing receivable originated two years prior to latest fiscal year.

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