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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Commercial Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year $ 253,315 $ 592,095
Amortized cost, year two, originated in fiscal year before current fiscal year 594,144 534,839
Amortized cost, year three, originated two years before current fiscal year 491,176 688,191
Amortized cost, year four, originated three years before current fiscal year 643,697 459,451
Amortized cost, year five, originated four years before current fiscal year 444,046 402,400
Amortized cost, originated more than five years before current fiscal year 1,176,900 951,526
Mortgage loans, amortized cost 3,603,278 3,628,502
Commercial Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 253,315 592,095
Amortized cost, year two, originated in fiscal year before current fiscal year 594,144 534,839
Amortized cost, year three, originated two years before current fiscal year 491,176 688,191
Amortized cost, year four, originated three years before current fiscal year 643,697 459,451
Amortized cost, year five, originated four years before current fiscal year 444,046 402,400
Amortized cost, originated more than five years before current fiscal year 1,172,184 951,526
Mortgage loans, amortized cost 3,598,562 3,628,502
Commercial Mortgage Loans | 30 - 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 0 0
Amortized cost, year two, originated in fiscal year before current fiscal year 0 0
Amortized cost, year three, originated two years before current fiscal year 0 0
Amortized cost, year four, originated three years before current fiscal year 0 0
Amortized cost, year five, originated four years before current fiscal year 0 0
Amortized cost, originated more than five years before current fiscal year 4,716 0
Mortgage loans, amortized cost 4,716 0
Commercial Mortgage Loans | 60 - 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 0 0
Amortized cost, year two, originated in fiscal year before current fiscal year 0 0
Amortized cost, year three, originated two years before current fiscal year 0 0
Amortized cost, year four, originated three years before current fiscal year 0 0
Amortized cost, year five, originated four years before current fiscal year 0 0
Amortized cost, originated more than five years before current 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, year one, originated in current fiscal year 0 0
Amortized cost, year two, originated in fiscal year before current fiscal year 0 0
Amortized cost, year three, originated two years before current fiscal year 0 0
Amortized cost, year four, originated three years before current fiscal year 0 0
Amortized cost, year five, originated four years before current fiscal year 0 0
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost 0 0
Agricultural Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 173,546 165,764
Amortized cost, year two, originated in fiscal year before current fiscal year 161,390 196,521
Amortized cost, year three, originated two years before current fiscal year 191,722 19,714
Amortized cost, year four, originated three years before current fiscal year 5,806 25,000
Amortized cost, year five, originated four years before current fiscal year 34,000 0
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost 566,464 406,999
Agricultural Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 173,546 165,764
Amortized cost, year two, originated in fiscal year before current fiscal year 161,390 196,521
Amortized cost, year three, originated two years before current fiscal year 190,941 19,714
Amortized cost, year four, originated three years before current fiscal year 5,806 25,000
Amortized cost, year five, originated four years before current fiscal year 34,000 0
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost 565,683 406,999
Agricultural Mortgage Loans | 30 - 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 0 0
Amortized cost, year two, originated in fiscal year before current fiscal year 0 0
Amortized cost, year three, originated two years before current fiscal year 781 0
Amortized cost, year four, originated three years before current fiscal year 0 0
Amortized cost, year five, originated four years before current fiscal year 0 0
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost 781 0
Agricultural Mortgage Loans | 60 - 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 0 0
Amortized cost, year two, originated in fiscal year before current fiscal year 0 0
Amortized cost, year three, originated two years before current fiscal year 0 0
Amortized cost, year four, originated three years before current fiscal year 0 0
Amortized cost, year five, originated four years before current fiscal year 0 0
Amortized cost, originated more than five years before current 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, year one, originated in current fiscal year 0 0
Amortized cost, year two, originated in fiscal year before current fiscal year 0 0
Amortized cost, year three, originated two years before current fiscal year 0 0
Amortized cost, year four, originated three years before current fiscal year 0 0
Amortized cost, year five, originated four years before current fiscal year 0 0
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost 0 0
Residential Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 904,698 1,105,239
Amortized cost, year two, originated in fiscal year before current fiscal year 839,298 473,444
Amortized cost, year three, originated two years before current fiscal year 293,981 79,762
Amortized cost, year four, originated three years before current fiscal year 46,705 17,325
Amortized cost, year five, originated four years before current fiscal year 6,009 751
Amortized cost, originated more than five years before current fiscal year 571 0
Mortgage loans, amortized cost 2,091,262 1,676,521
Residential Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 877,500 1,092,438
Amortized cost, year two, originated in fiscal year before current fiscal year 800,494 454,532
Amortized cost, year three, originated two years before current fiscal year 279,948 67,380
Amortized cost, year four, originated three years before current fiscal year 39,923 16,898
Amortized cost, year five, originated four years before current fiscal year 3,915 751
Amortized cost, originated more than five years before current fiscal year 571 0
Mortgage loans, amortized cost 2,002,351 1,631,999
Residential Mortgage Loans | 30 - 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 19,574 10,284
Amortized cost, year two, originated in fiscal year before current fiscal year 24,547 12,363
Amortized cost, year three, originated two years before current fiscal year 5,179 11,373
Amortized cost, year four, originated three years before current fiscal year 6,681 427
Amortized cost, year five, originated four years before current fiscal year 65 0
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost 56,046 34,447
Residential Mortgage Loans | 60 - 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 4,936 1,838
Amortized cost, year two, originated in fiscal year before current fiscal year 3,529 1,090
Amortized cost, year three, originated two years before current fiscal year 2,018 102
Amortized cost, year four, originated three years before current fiscal year 101 0
Amortized cost, year five, originated four years before current fiscal year 2,029 0
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost 12,613 3,030
Residential Mortgage Loans | Over 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 2,688 679
Amortized cost, year two, originated in fiscal year before current fiscal year 10,728 5,459
Amortized cost, year three, originated two years before current fiscal year 6,836 907
Amortized cost, year four, originated three years before current fiscal year 0 0
Amortized cost, year five, originated four years before current fiscal year 0 0
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost $ 20,252 $ 7,045