v3.26.1
SUMMARY OF INVESTMENTS - Carrying Value of Commercial Mortgage Loans and Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Total mortgage loans at amortized cost $ 30,962 $ 31,116
Allowance for mortgage loan losses (286) (286)
Mortgage loans, net 30,676 30,830
Total mortgage loans | Commercial Mortgage Loans by Region    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 30,962 $ 31,116
Percent of Total 100.00% 100.00%
Total mortgage loans | Commercial Mortgage Loans by Region | East North Central    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 3,147 $ 3,162
Percent of Total 10.20% 10.20%
Total mortgage loans | Commercial Mortgage Loans by Region | Southern Atlantic    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 14,168 $ 14,206
Percent of Total 45.80% 45.70%
Total mortgage loans | Commercial Mortgage Loans by Region | East South Central    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 6,905 $ 6,977
Percent of Total 22.30% 22.40%
Total mortgage loans | Commercial Mortgage Loans by Region | Middle Atlantic    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 2,015 $ 2,028
Percent of Total 6.50% 6.50%
Total mortgage loans | Commercial Mortgage Loans by Region | Mountain    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 1,992 $ 1,992
Percent of Total 6.40% 6.40%
Total mortgage loans | Commercial Mortgage Loans by Region | West North Central    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 2,735 $ 2,751
Percent of Total 8.80% 8.80%
Total mortgage loans | Commercial Mortgage Loans by Property Type    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 30,962 $ 31,116
Percent of Total 100.00% 100.00%
Total mortgage loans | Commercial Mortgage Loans by Property Type | Multifamily    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 8,138 $ 8,184
Percent of Total 26.30% 26.30%
Total mortgage loans | Commercial Mortgage Loans by Property Type | Office    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 7,651 $ 7,703
Percent of Total 24.70% 24.80%
Total mortgage loans | Commercial Mortgage Loans by Property Type | Industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 3,228 $ 3,248
Percent of Total 10.40% 10.40%
Total mortgage loans | Commercial Mortgage Loans by Property Type | Retail    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 9,930 $ 9,953
Percent of Total 32.10% 32.00%
Total mortgage loans | Commercial Mortgage Loans by Property Type | Mixed use/Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Mortgage loans, net $ 2,015 $ 2,028
Percent of Total 6.50% 6.50%
Less than 65%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total mortgage loans at amortized cost $ 22,743 $ 22,846
65%-75%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total mortgage loans at amortized cost $ 8,219 $ 8,270