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

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

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Amount of financing receivable not past due.

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