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Mortgage Loans on Real Estate (Aging of Financing Receivables) (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Commercial Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year $ 18,444 $ 425,875
Amortized cost, year two, originated in fiscal year before current fiscal year 478,594 592,468
Amortized cost, year three, originated two years before current fiscal year 599,883 486,339
Amortized cost, year four, originated three years before current fiscal year 476,290 591,076
Amortized cost, year five, originated four years before current fiscal year 561,561 416,132
Amortized cost, originated more than five years before current fiscal year 1,394,597 1,042,668
Mortgage loans, amortized cost 3,529,369 3,554,558
Commercial Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 18,444 425,875
Amortized cost, year two, originated in fiscal year before current fiscal year 478,594 592,468
Amortized cost, year three, originated two years before current fiscal year 599,883 486,339
Amortized cost, year four, originated three years before current fiscal year 476,290 591,076
Amortized cost, year five, originated four years before current fiscal year 561,561 416,132
Amortized cost, originated more than five years before current fiscal year 1,394,597 1,042,668
Mortgage loans, amortized cost 3,529,369 3,554,558
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 35,743 196,347
Amortized cost, year two, originated in fiscal year before current fiscal year 193,956 160,641
Amortized cost, year three, originated two years before current fiscal year 144,791 169,346
Amortized cost, year four, originated three years before current fiscal year 170,175 5,629
Amortized cost, year five, originated four years before current fiscal year 2,276 34,000
Amortized cost, originated more than five years before current fiscal year 34,000 0
Mortgage loans, amortized cost 580,941 565,963
Agricultural Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 32,743 196,347
Amortized cost, year two, originated in fiscal year before current fiscal year 193,956 160,641
Amortized cost, year three, originated two years before current fiscal year 144,791 166,211
Amortized cost, year four, originated three years before current fiscal year 170,175 5,629
Amortized cost, year five, originated four years before current fiscal year 2,276 34,000
Amortized cost, originated more than five years before current fiscal year 34,000 0
Mortgage loans, amortized cost 577,941 562,828
Agricultural Mortgage Loans | 30 - 59 days past due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 3,000 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 3,000 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 3,135
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 3,135
Residential Mortgage Loans    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 707,424 1,970,718
Amortized cost, year two, originated in fiscal year before current fiscal year 1,860,159 624,834
Amortized cost, year three, originated two years before current fiscal year 504,511 233,741
Amortized cost, year four, originated three years before current fiscal year 196,650 31,262
Amortized cost, year five, originated four years before current fiscal year 30,408 4,506
Amortized cost, originated more than five years before current fiscal year 4,542 417
Mortgage loans, amortized cost 3,303,694 2,865,478
Residential Mortgage Loans | Current    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 663,036 1,915,169
Amortized cost, year two, originated in fiscal year before current fiscal year 1,778,621 595,363
Amortized cost, year three, originated two years before current fiscal year 473,986 211,119
Amortized cost, year four, originated three years before current fiscal year 186,088 27,483
Amortized cost, year five, originated four years before current fiscal year 26,497 1,710
Amortized cost, originated more than five years before current fiscal year 978 417
Mortgage loans, amortized cost 3,129,206 2,751,261
Residential Mortgage Loans | 30 - 59 days past due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 39,680 39,179
Amortized cost, year two, originated in fiscal year before current fiscal year 43,994 8,238
Amortized cost, year three, originated two years before current fiscal year 14,638 13,073
Amortized cost, year four, originated three years before current fiscal year 4,650 1,960
Amortized cost, year five, originated four years before current fiscal year 2,274 0
Amortized cost, originated more than five years before current fiscal year 162 0
Mortgage loans, amortized cost 105,398 62,450
Residential Mortgage Loans | 60 - 89 days past due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 3,901 6,668
Amortized cost, year two, originated in fiscal year before current fiscal year 10,276 7,165
Amortized cost, year three, originated two years before current fiscal year 5,427 3,034
Amortized cost, year four, originated three years before current fiscal year 1,030 57
Amortized cost, year five, originated four years before current fiscal year 0 0
Amortized cost, originated more than five years before current fiscal year 190 0
Mortgage loans, amortized cost 20,824 16,924
Residential Mortgage Loans | Over 90 days past due    
Financing Receivable, Past Due [Line Items]    
Amortized cost, year one, originated in current fiscal year 807 9,702
Amortized cost, year two, originated in fiscal year before current fiscal year 27,268 14,068
Amortized cost, year three, originated two years before current fiscal year 10,460 6,515
Amortized cost, year four, originated three years before current fiscal year 4,882 1,762
Amortized cost, year five, originated four years before current fiscal year 1,637 2,796
Amortized cost, originated more than five years before current fiscal year 3,212 0
Mortgage loans, amortized cost $ 48,266 $ 34,843