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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Commercial Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year $ 592,095 $ 543,991
Amortized cost, originated in fiscal year before latest fiscal year 534,839 755,584
Amortized cost, originated two years before latest fiscal year 688,191 527,670
Amortized cost, originated three years before latest fiscal year 459,451 459,055
Amortized cost, originated four years before latest fiscal year 402,400 411,834
Amortized cost, originated five or more years before latest fiscal year 951,526 880,754
Mortgage loans, amortized cost 3,628,502 3,578,888
Commercial Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 592,095 543,991
Amortized cost, originated in fiscal year before latest fiscal year 534,839 755,584
Amortized cost, originated two years before latest fiscal year 688,191 527,670
Amortized cost, originated three years before latest fiscal year 459,451 459,055
Amortized cost, originated four years before latest fiscal year 402,400 411,834
Amortized cost, originated five or more years before latest fiscal year 951,526 880,754
Mortgage loans, amortized cost 3,628,502 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 Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 165,764 196,190
Amortized cost, originated in fiscal year before latest fiscal year 196,521 23,983
Amortized cost, originated two years before latest fiscal year 19,714 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 406,999 245,173
Agricultural Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 165,764 196,190
Amortized cost, originated in fiscal year before latest fiscal year 196,521 23,983
Amortized cost, originated two years before latest fiscal year 19,714 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 406,999 245,173
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 1,105,239 347,207
Amortized cost, originated in fiscal year before latest fiscal year 473,444 25,250
Amortized cost, originated two years before latest fiscal year 79,762 0
Amortized cost, originated three years before latest fiscal year 17,325 0
Amortized cost, originated four years before latest fiscal year 751 0
Amortized cost, originated five or more years before latest fiscal year 0 0
Mortgage loans, amortized cost 1,676,521 372,457
Residential Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 1,092,438 321,779
Amortized cost, originated in fiscal year before latest fiscal year 454,532 24,951
Amortized cost, originated two years before latest fiscal year 67,380 0
Amortized cost, originated three years before latest fiscal year 16,898 0
Amortized cost, originated four years before latest fiscal year 751 0
Amortized cost, originated five or more years before latest fiscal year 0 0
Mortgage loans, amortized cost 1,631,999 346,730
Residential Mortgage Loans | 30 - 59 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 10,284 25,150
Amortized cost, originated in fiscal year before latest fiscal year 12,363 299
Amortized cost, originated two years before latest fiscal year 11,373 0
Amortized cost, originated three years before latest fiscal year 427 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 34,447 25,449
Residential Mortgage Loans | 60 - 89 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 1,838 111
Amortized cost, originated in fiscal year before latest fiscal year 1,090 0
Amortized cost, originated two years before latest fiscal year 102 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 3,030 111
Residential Mortgage Loans | Over 90 Days Past Due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, originated in current fiscal year 679 167
Amortized cost, originated in fiscal year before latest fiscal year 5,459 0
Amortized cost, originated two years before latest fiscal year 907 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 $ 7,045 $ 167