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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Commercial Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year $ 391,127 $ 592,095
Amortized cost, year two, originated in fiscal year before current fiscal year 593,951 534,839
Amortized cost, year three, originated two years before current fiscal year 488,719 688,191
Amortized cost, year four, originated three years before current fiscal year 601,991 459,451
Amortized cost, year five, originated four years before current fiscal year 431,078 402,400
Amortized cost, originated more than five years before current fiscal year 1,076,726 951,526
Mortgage loans, amortized cost 3,583,592 3,628,502
Commercial Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 391,127 592,095
Amortized cost, year two, originated in fiscal year before current fiscal year 593,951 534,839
Amortized cost, year three, originated two years before current fiscal year 488,719 688,191
Amortized cost, year four, originated three years before current fiscal year 601,991 459,451
Amortized cost, year five, originated four years before current fiscal year 431,078 402,400
Amortized cost, originated more than five years before current fiscal year 1,076,726 951,526
Mortgage loans, amortized cost 3,583,592 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 0 0
Mortgage loans, amortized cost 0 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 188,916 165,764
Amortized cost, year two, originated in fiscal year before current fiscal year 158,513 196,521
Amortized cost, year three, originated two years before current fiscal year 193,598 19,714
Amortized cost, year four, originated three years before current fiscal year 5,768 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 580,795 406,999
Agricultural Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 188,916 165,764
Amortized cost, year two, originated in fiscal year before current fiscal year 158,513 196,521
Amortized cost, year three, originated two years before current fiscal year 190,463 19,714
Amortized cost, year four, originated three years before current fiscal year 5,768 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 577,660 406,999
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 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 | 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 3,135 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 3,135 0
Residential Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 1,479,160 1,105,239
Amortized cost, year two, originated in fiscal year before current fiscal year 704,745 473,444
Amortized cost, year three, originated two years before current fiscal year 250,732 79,762
Amortized cost, year four, originated three years before current fiscal year 33,102 17,325
Amortized cost, year five, originated four years before current fiscal year 4,506 751
Amortized cost, originated more than five years before current fiscal year 417 0
Mortgage loans, amortized cost 2,472,662 1,676,521
Residential Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 1,457,896 1,092,438
Amortized cost, year two, originated in fiscal year before current fiscal year 672,371 454,532
Amortized cost, year three, originated two years before current fiscal year 233,185 67,380
Amortized cost, year four, originated three years before current fiscal year 31,457 16,898
Amortized cost, year five, originated four years before current fiscal year 1,710 751
Amortized cost, originated more than five years before current fiscal year 417 0
Mortgage loans, amortized cost 2,397,036 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 15,049 10,284
Amortized cost, year two, originated in fiscal year before current fiscal year 9,384 12,363
Amortized cost, year three, originated two years before current fiscal year 6,443 11,373
Amortized cost, year four, originated three years before current fiscal year 1,645 427
Amortized cost, year five, originated four years before current fiscal year 767 0
Amortized cost, originated more than five years before current fiscal year 0 0
Mortgage loans, amortized cost 33,288 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 3,298 1,838
Amortized cost, year two, originated in fiscal year before current fiscal year 440 1,090
Amortized cost, year three, originated two years before current fiscal year 4,641 102
Amortized cost, year four, originated three years before current fiscal year 0 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 10,408 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 2,917 679
Amortized cost, year two, originated in fiscal year before current fiscal year 22,550 5,459
Amortized cost, year three, originated two years before current fiscal year 6,463 907
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 $ 31,930 $ 7,045