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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Commercial Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year $ 128,981 $ 543,991
Amortized cost, originated in fiscal year before latest fiscal year 537,879 755,584
Amortized cost, originated two years before latest fiscal year 751,659 527,670
Amortized cost, originated three years before latest fiscal year 462,393 459,055
Amortized cost, originated four years before latest fiscal year 409,611 411,834
Amortized cost, originated five or more years before latest fiscal year 1,033,461 880,754
Mortgage loans, amortized cost 3,323,984 3,578,888
Commercial Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 128,981 543,991
Amortized cost, originated in fiscal year before latest fiscal year 537,879 755,584
Amortized cost, originated two years before latest fiscal year 751,659 527,670
Amortized cost, originated three years before latest fiscal year 462,393 459,055
Amortized cost, originated four years before latest fiscal year 409,611 411,834
Amortized cost, originated five or more years before latest fiscal year 1,033,461 880,754
Mortgage loans, amortized cost 3,323,984 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, amortized cost 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, amortized cost 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, amortized cost 0 0
Agricultural    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 109,091 196,190
Amortized cost, originated in fiscal year before latest fiscal year 199,792 23,983
Amortized cost, originated two years before latest fiscal year 19,858 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, amortized cost 353,741 245,173
Agricultural | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 109,091 196,190
Amortized cost, originated in fiscal year before latest fiscal year 199,792 23,983
Amortized cost, originated two years before latest fiscal year 19,858 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, amortized cost 353,741 245,173
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, amortized cost 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, amortized cost 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, amortized cost 0 0
Residential Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 285,919 347,207
Amortized cost, originated in fiscal year before latest fiscal year 328,837 25,250
Amortized cost, originated two years before latest fiscal year 17,819 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, amortized cost 632,575 372,457
Residential Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 232,026 321,779
Amortized cost, originated in fiscal year before latest fiscal year 316,539 24,951
Amortized cost, originated two years before latest fiscal year 16,520 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, amortized cost 565,085 346,730
Residential Mortgage Loans | 30 - 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 49,684 25,150
Amortized cost, originated in fiscal year before latest fiscal year 5,343 299
Amortized cost, originated two years before latest fiscal year 389 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, amortized cost 55,416 25,449
Residential Mortgage Loans | 60 - 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 4,209 111
Amortized cost, originated in fiscal year before latest fiscal year 951 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, amortized cost 5,160 111
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 6,004 0
Amortized cost, originated two years before latest fiscal year 910 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, amortized cost $ 6,914 $ 167