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Significant group concentrations of credit risk (Details)		12 Months Ended
	Jan. 26, 2024	Dec. 31, 2023
Major customers
Percentage of workforce covered by collective bargaining arrangement		50.00%
Percentage of benchmark loan to appraisal ratio in excess of which mortgage insurance is required		80.00%
Hawaiian Electric Company, Inc. and Subsidiaries | Subsequent Event
Major customers
Market rate adjustment percentage	11.40%
Annual incentive percentage	4.00%
Contract term	3 years
General wage increase percentage	3.00%
Incentive payment percentage	1.00%
American Savings Bank (ASB)
Major customers
Percentage of benchmark loan to appraisal ratio in excess of which mortgage insurance is required		80.00%

X

- Definition

Collective Bargaining Arrangement, Annual Incentive, Percentage

+ References

No definition available.

+ Details

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- Definition

Collective Bargaining Arrangement, Incentive Payment, Percentage

+ References

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- Definition

Collective Bargaining Arrangement, Increase In Compensation, Percentage

+ References

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- Definition

Collective Bargaining Arrangement, Market Rate Adjustment, Percentage

+ References

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- Definition

Collective Bargaining Arrangement, Term

+ References

No definition available.

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X

- Definition

Represents the minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required as per the policy of the reporting entity.

+ References

No definition available.

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X

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 954
-SubTopic 310
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481027/954-310-50-2

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- Definition

Percentage of entity's employees covered by collective-bargaining arrangement (CBA) to all participants in multiemployer pension plan determined to be individually insignificant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 80
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480576/715-80-50-5

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