INVESTMENTS - Maturity of Residential and Commercial Loans (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Remainder of 2021	$ 615,309
2022	1,372,514
2023	1,293,380
2024	1,771,043
2025	679,495
2026	1,410,908
2027 and thereafter	7,333,189
Total	14,475,838
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Remainder of 2021	103,037
2022	410,358
2023	298,538
2024	349,931
2025	18,434
2026	365,190
2027 and thereafter	4,052,766
Total	5,598,254
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Remainder of 2021	512,272
2022	962,156
2023	994,842
2024	1,421,112
2025	661,061
2026	1,045,718
2027 and thereafter	3,280,423
Total	$ 8,877,584

Financing Receivable, Before Allowance For Credit Loss, Maturity, After Year Five

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Financing Receivable, Before Allowance For Credit Loss, Maturity, Remainder Of Fiscal Year

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Financing Receivable, Before Allowance For Credit Loss, Maturity, Year Four

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