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INVESTMENTS - Schedule of AFS Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2025	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Expected credit loss on available-for-sale debt securities at beginning of period	$ 1,018	$ 1,018	$ 566
Provision for (or reversal of) credit loss expense		(296)	452
Expected credit loss on available-for-sale debt securities at end of period		722	1,018
Corporate Bonds
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Expected credit loss on available-for-sale debt securities at beginning of period	894	894	469
Provision for (or reversal of) credit loss expense		(241)	425
Expected credit loss on available-for-sale debt securities at end of period		653	894
Municipal Bonds
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Expected credit loss on available-for-sale debt securities at beginning of period	3	3	4
Provision for (or reversal of) credit loss expense		(2)	(1)
Expected credit loss on available-for-sale debt securities at end of period		1	3
Redeemable Preferred Stock
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Expected credit loss on available-for-sale debt securities at beginning of period	121	121	93
Provision for (or reversal of) credit loss expense		(54)	28
Expected credit loss on available-for-sale debt securities at end of period		67	121
Mortgage-Backed and Asset-Backed Securities
Debt Securities, Available-for-sale, Allowance for Credit Loss [Roll Forward]
Expected credit loss on available-for-sale debt securities at beginning of period	0	0	0
Provision for (or reversal of) credit loss expense	$ 0	1
Expected credit loss on available-for-sale debt securities at end of period		$ 1	$ 0

X

- Definition

Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479106/326-30-50-9

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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