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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Commercial Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year $ 94,924 $ 543,991
Amortized cost, originated in fiscal year before latest fiscal year 539,326 755,584
Amortized cost, originated two years before latest fiscal year 753,362 527,670
Amortized cost, originated three years before latest fiscal year 506,817 459,055
Amortized cost, originated four years before latest fiscal year 448,100 411,834
Amortized cost, originated five or more years before latest fiscal year 1,115,941 880,754
Mortgage loans, amortized cost 3,458,470 3,578,888
Commercial Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 94,924 543,991
Amortized cost, originated in fiscal year before latest fiscal year 539,326 755,584
Amortized cost, originated two years before latest fiscal year 753,362 527,670
Amortized cost, originated three years before latest fiscal year 506,817 459,055
Amortized cost, originated four years before latest fiscal year 448,100 411,834
Amortized cost, originated five or more years before latest fiscal year 1,115,941 880,754
Mortgage loans, amortized cost 3,458,470 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 30,416 196,190
Amortized cost, originated in fiscal year before latest fiscal year 201,319 23,983
Amortized cost, originated two years before latest fiscal year 19,984 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 276,719 245,173
Agricultural | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 30,416 196,190
Amortized cost, originated in fiscal year before latest fiscal year 199,731 23,983
Amortized cost, originated two years before latest fiscal year 19,984 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 275,131 245,173
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 1,588 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 1,588 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 185,563 347,207
Amortized cost, originated in fiscal year before latest fiscal year 384,590 25,250
Amortized cost, originated two years before latest fiscal year 21,184 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 591,337 372,457
Residential Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 183,180 321,779
Amortized cost, originated in fiscal year before latest fiscal year 369,038 24,951
Amortized cost, originated two years before latest fiscal year 20,126 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 572,344 346,730
Residential Mortgage Loans | 30 - 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 2,383 25,150
Amortized cost, originated in fiscal year before latest fiscal year 7,652 299
Amortized cost, originated two years before latest fiscal year 107 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 10,142 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 2,992 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 2,992 111
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 4,908 0
Amortized cost, originated two years before latest fiscal year 951 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 $ 5,859 $ 167