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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Mortgage loans, past due |  | $ 0
Commercial Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | $ 543,991 |
2019 | 755,584 |
2018 | 527,670 |
2017 | 459,055 |
2016 | 411,834 |
Prior | 880,754 |
Amortized cost | 3,578,888 | 3,406,712
Commercial Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 543,991 |
2019 | 755,584 |
2018 | 527,670 |
2017 | 459,055 |
2016 | 411,834 |
Prior | 880,754 |
Mortgage loans, current | 3,578,888 |
Commercial Mortgage Loans | 30 to 59 Days |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, past due | 0 |
Commercial Mortgage Loans | 60 to 89 Days |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, past due | 0 |
Commercial Mortgage Loans | 90 Days and Over |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, past due | 0 |
Agricultural Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 196,190 |
2019 | 23,983 |
2018 | 25,000 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Amortized cost | 245,173 | 51,260
Agricultural Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 196,190 |
2019 | 23,983 |
2018 | 25,000 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, current | 245,173 |
Agricultural Mortgage Loans | 30 to 59 Days |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, past due | 0 |
Agricultural Mortgage Loans | 60 to 89 Days |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, past due | 0 |
Agricultural Mortgage Loans | 90 Days and Over |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 0 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, past due | 0 |
Residential Mortgage Loans |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 347,207 |
2019 | 25,250 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Amortized cost | 372,457 | $ 0
Residential Mortgage Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 321,779 |
2019 | 24,951 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, current | 346,730 |
Residential Mortgage Loans | 30 to 59 Days |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 25,150 |
2019 | 299 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, past due | 25,449 |
Residential Mortgage Loans | 60 to 89 Days |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 111 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, past due | 111 |
Residential Mortgage Loans | 90 Days and Over |  |
Financing Receivable, Past Due [Line Items] |  |
2020 | 167 |
2019 | 0 |
2018 | 0 |
2017 | 0 |
2016 | 0 |
Prior | 0 |
Mortgage loans, past due | $ 167 |

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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 + Details
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- Definition Amount of financing receivable originated five or more years prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
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