XML 57 R43.htm IDEA: XBRL DOCUMENT v3.25.1

Investments - Schedule of Realized Gain (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Fair Value at Sale
Fair value at sale	$ 16,458	$ 2,994
Fair value at sale	1,000	0
Net fair value at sale	17,458	2,994
Debt Securities, Available-for-Sale, Realized Gain	1,385	0
Debt Securities, Available-for-Sale, Realized Loss	(3)	0
Debt Securities, Available-for-Sale, Realized Gain (Loss)	1,382	0
Fixed Maturities
Fair Value at Sale
Fair value at sale	6,311	994
Fair value at sale	1,000	0
Debt Securities, Available-for-Sale, Realized Gain	2	0
Debt Securities, Available-for-Sale, Realized Loss	(3)	0
Equity Securities
Fair Value at Sale
Fair value at sale	9,998	0
Equity Securities, FV-NI, Realized Gain	1,383	0
Short-term Investments
Fair Value at Sale
Fair value at sale	149	0
Debt Securities, Available-for-Sale, Realized Gain	0	0
Limited Partnership
Fair Value at Sale
Fair value at sale	0	2,000
Debt Securities, Available-for-Sale, Realized Gain	$ 0	$ 0

X

- Definition

Available-for-sale, Gross Realized Gains, Fair Value at Sale

+ References

No definition available.

+ Details

Name:	acic_AvailableForSaleGrossRealizedGainsFairValueAtSale
Namespace Prefix:	acic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Available-for-sale, Gross Realized Gains (Losses), Fair Value at Sale

+ References

No definition available.

+ Details

Name:	acic_AvailableForSaleGrossRealizedGainsLossesFairValueAtSale
Namespace Prefix:	acic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Available-for-sale, Gross Realized Losses, Fair Value at Sale

+ References

No definition available.

+ Details

Name:	acic_AvailableForSaleGrossRealizedLossesFairValueAtSale
Namespace Prefix:	acic_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of realized gain 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 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleRealizedGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of realized gain (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/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleRealizedGainLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of realized 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 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleRealizedLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479536/321-10-50-4

+ Details

Name:	us-gaap_EquitySecuritiesFvNiRealizedGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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