Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Commercial Mortgage Loans
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	$ 54,134	$ 543,991
Amortized cost, originated in fiscal year before latest fiscal year	541,611	755,584
Amortized cost, originated two years before latest fiscal year	754,416	527,670
Amortized cost, originated three years before latest fiscal year	511,189	459,055
Amortized cost, originated four years before latest fiscal year	455,370	411,834
Amortized cost, originated five or more years before latest fiscal year	1,229,207	880,754
Amortized cost	3,545,927	3,578,888
Commercial Mortgage Loans \| Current
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	54,134	543,991
Amortized cost, originated in fiscal year before latest fiscal year	541,611	755,584
Amortized cost, originated two years before latest fiscal year	754,416	527,670
Amortized cost, originated three years before latest fiscal year	511,189	459,055
Amortized cost, originated four years before latest fiscal year	455,370	411,834
Amortized cost, originated five or more years before latest fiscal year	1,229,207	880,754
Mortgage loans, current	3,545,927	3,578,888
Commercial Mortgage Loans \| 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	0	0
Amortized cost, originated in fiscal year before latest fiscal year	0	0
Amortized cost, originated two years before latest fiscal year	0	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, past due	0	0
Commercial Mortgage Loans \| 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	0	0
Amortized cost, originated in fiscal year before latest fiscal year	0	0
Amortized cost, originated two years before latest fiscal year	0	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, past due	0	0
Commercial Mortgage Loans \| Over 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	0	0
Amortized cost, originated in fiscal year before latest fiscal year	0	0
Amortized cost, originated two years before latest fiscal year	0	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, past due	0	0
Agricultural
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	23,355	196,190
Amortized cost, originated in fiscal year before latest fiscal year	197,147	23,983
Amortized cost, originated two years before latest fiscal year	20,083	25,000
Amortized cost, originated three years before latest fiscal year	25,000	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Amortized cost	265,585	245,173
Agricultural \| Current
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	23,355	196,190
Amortized cost, originated in fiscal year before latest fiscal year	197,147	23,983
Amortized cost, originated two years before latest fiscal year	20,083	25,000
Amortized cost, originated three years before latest fiscal year	25,000	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, current	265,585	245,173
Agricultural \| 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	0	0
Amortized cost, originated in fiscal year before latest fiscal year	0	0
Amortized cost, originated two years before latest fiscal year	0	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, past due	0	0
Agricultural \| 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	0	0
Amortized cost, originated in fiscal year before latest fiscal year	0	0
Amortized cost, originated two years before latest fiscal year	0	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, past due	0	0
Agricultural \| Over 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	0	0
Amortized cost, originated in fiscal year before latest fiscal year	0	0
Amortized cost, originated two years before latest fiscal year	0	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, past due	0	0
Residential Mortgage Loans
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	76,510	347,207
Amortized cost, originated in fiscal year before latest fiscal year	406,372	25,250
Amortized cost, originated two years before latest fiscal year	24,722	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Amortized cost	507,604	372,457
Residential Mortgage Loans \| Current
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	72,910	321,779
Amortized cost, originated in fiscal year before latest fiscal year	275,127	24,951
Amortized cost, originated two years before latest fiscal year	20,406	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, current	368,443	346,730
Residential Mortgage Loans \| 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	3,600	25,150
Amortized cost, originated in fiscal year before latest fiscal year	90,607	299
Amortized cost, originated two years before latest fiscal year	1,981	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, past due	96,188	25,449
Residential Mortgage Loans \| 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	0	111
Amortized cost, originated in fiscal year before latest fiscal year	37,925	0
Amortized cost, originated two years before latest fiscal year	2,335	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, past due	40,260	111
Residential Mortgage Loans \| Over 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Amortized cost, originated in current fiscal year	0	167
Amortized cost, originated in fiscal year before latest fiscal year	2,713	0
Amortized cost, originated two years before latest fiscal year	0	0
Amortized cost, originated three years before latest fiscal year	0	0
Amortized cost, originated four years before latest fiscal year	0	0
Amortized cost, originated five or more years before latest fiscal year	0	0
Mortgage loans, past due	$ 2,713	$ 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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