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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Commercial Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year $ 90,976 $ 592,095
Amortized cost, originated in fiscal year before latest fiscal year 593,129 534,839
Amortized cost, originated two years before latest fiscal year 501,301 688,191
Amortized cost, originated three years before latest fiscal year 662,996 459,451
Amortized cost, originated four years before latest fiscal year 456,478 402,400
Amortized cost, originated five or more years before latest fiscal year 1,301,119 951,526
Mortgage loans, amortized cost 3,605,999 3,628,502
Commercial Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 90,976 592,095
Amortized cost, originated in fiscal year before latest fiscal year 593,129 534,839
Amortized cost, originated two years before latest fiscal year 501,301 688,191
Amortized cost, originated three years before latest fiscal year 662,996 459,451
Amortized cost, originated four years before latest fiscal year 456,478 402,400
Amortized cost, originated five or more years before latest fiscal year 1,301,119 951,526
Mortgage loans, amortized cost 3,605,999 3,628,502
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 Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 66,743 165,764
Amortized cost, originated in fiscal year before latest fiscal year 164,616 196,521
Amortized cost, originated two years before latest fiscal year 190,440 19,714
Amortized cost, originated three years before latest fiscal year 16,288 25,000
Amortized cost, originated four years before latest fiscal year 25,000 0
Amortized cost, originated five or more years before latest fiscal year 0 0
Mortgage loans, amortized cost 463,087 406,999
Agricultural Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 66,743 165,764
Amortized cost, originated in fiscal year before latest fiscal year 164,616 196,521
Amortized cost, originated two years before latest fiscal year 190,440 19,714
Amortized cost, originated three years before latest fiscal year 16,288 25,000
Amortized cost, originated four years before latest fiscal year 25,000 0
Amortized cost, originated five or more years before latest fiscal year 0 0
Mortgage loans, amortized cost 463,087 406,999
Agricultural 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
Agricultural 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
Agricultural 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
Residential Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 219,854 1,105,239
Amortized cost, originated in fiscal year before latest fiscal year 1,040,856 473,444
Amortized cost, originated two years before latest fiscal year 358,712 79,762
Amortized cost, originated three years before latest fiscal year 63,363 17,325
Amortized cost, originated four years before latest fiscal year 11,698 751
Amortized cost, originated five or more years before latest fiscal year 572 0
Mortgage loans, amortized cost 1,695,055 1,676,521
Residential Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 172,104 1,092,438
Amortized cost, originated in fiscal year before latest fiscal year 1,002,004 454,532
Amortized cost, originated two years before latest fiscal year 332,075 67,380
Amortized cost, originated three years before latest fiscal year 48,951 16,898
Amortized cost, originated four years before latest fiscal year 9,669 751
Amortized cost, originated five or more years before latest fiscal year 572 0
Mortgage loans, amortized cost 1,565,375 1,631,999
Residential Mortgage Loans | 30 - 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 47,750 10,284
Amortized cost, originated in fiscal year before latest fiscal year 12,618 12,363
Amortized cost, originated two years before latest fiscal year 14,235 11,373
Amortized cost, originated three years before latest fiscal year 14,311 427
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 88,914 34,447
Residential Mortgage Loans | 60 - 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 0 1,838
Amortized cost, originated in fiscal year before latest fiscal year 21,040 1,090
Amortized cost, originated two years before latest fiscal year 5,133 102
Amortized cost, originated three years before latest fiscal year 101 0
Amortized cost, originated four years before latest fiscal year 2,029 0
Amortized cost, originated five or more years before latest fiscal year 0 0
Mortgage loans, amortized cost 28,303 3,030
Residential Mortgage Loans | Over 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 0 679
Amortized cost, originated in fiscal year before latest fiscal year 5,194 5,459
Amortized cost, originated two years before latest fiscal year 7,269 907
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 $ 12,463 $ 7,045