SUMMARY OF INVESTMENTS - Carrying Value of Commercial Mortgage Loans and Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2026	Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]
Total mortgage loans at amortized cost	$ 30,649	$ 31,116
Allowance for mortgage loan losses	(284)	(286)
Mortgage loans, net	30,365	30,830
Total mortgage loans \| Commercial Mortgage Loans by Region
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage loans, net	$ 30,649	$ 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	$ 3,118	$ 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	$ 14,088	$ 14,206
Percent of Total	46.00%	45.70%
Total mortgage loans \| Commercial Mortgage Loans by Region \| East South Central
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage loans, net	$ 6,758	$ 6,977
Percent of Total	22.00%	22.40%
Total mortgage loans \| Commercial Mortgage Loans by Region \| Middle Atlantic
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage loans, net	$ 1,990	$ 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	6.50%	6.40%
Total mortgage loans \| Commercial Mortgage Loans by Region \| West North Central
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage loans, net	$ 2,703	$ 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	$ 30,649	$ 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	$ 8,046	$ 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	$ 7,543	$ 7,703
Percent of Total	24.60%	24.80%
Total mortgage loans \| Commercial Mortgage Loans by Property Type \| Industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage loans, net	$ 3,189	$ 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	$ 9,881	$ 9,953
Percent of Total	32.20%	32.00%
Total mortgage loans \| Commercial Mortgage Loans by Property Type \| Mixed use/Other
Financing Receivable, Credit Quality Indicator [Line Items]
Mortgage loans, net	$ 1,990	$ 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	$ 22,532	$ 22,846
65%-75%
Financing Receivable, Credit Quality Indicator [Line Items]
Total mortgage loans at amortized cost	$ 8,117	$ 8,270

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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