FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Thousands	12 Months Ended
Dec. 31, 2023 USD ($) fund	Dec. 31, 2022 USD ($)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Transfers into Level 3	$ 0	$ 0
Transfers into Level 3	0	0
Transfers out of level 3	0	0
Transfers out of level 3	$ 0	0
Number of investment funds transferred from level 3 to NAV practical expedient \| fund	2
Fixed maturities, held to maturity, at amortized cost	$ 686,296	698,351
Fair value	675,851	674,743
Advances from FHLB	85,790	81,388
Borrowings from FHLB	86,000	81,000
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	1,314,000	1,312,000
Estimate of Fair Value
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Senior notes	$ 1,198,000	$ 1,160,000

Fair Value Measurement With Unobservable Inputs, Reconciliation, Asset, Transfers Out Of Level 3 into Level 2

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- Definition

Fair Value Measurement With Unobservable Inputs, Reconciliation, Assets, Transfers From Level 2 Into Level 3

+ References

No definition available.

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Fair Value Measurement With Unobservable Inputs, Reconciliation, Liability, Transfers From Level 2 Into Level 3

+ References

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Fair Value Measurement With Unobservable Inputs, Reconciliation, Liability, Transfers Out Of Level 3 into Level 2

+ References

No definition available.

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- Definition

Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers Out Of Level 3, Number Of Investment Funds

+ References

No definition available.

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- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

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-Topic 942
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Amount excluding accrued interest, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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- Definition

Fair value portion of notes payable.

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