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Bank segment - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Allowance for credit losses
Goodwill impairment			$ 82,190,000	$ 0
Other bank borrowings	$ 520,000,000		520,000,000		$ 750,000,000
American Savings Bank (ASB)
Allowance for credit losses
Goodwill impairment	82,190,000	$ 0	$ 82,190,000	0
Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required			80.00%
Unused line and letters of credits	1,900,000,000		$ 1,900,000,000
Advances from the FHLB	520,000,000.0		520,000,000.0		200,000,000.0
American Savings Bank (ASB) | Federal Reserve Bank Advances
Allowance for credit losses
Other bank borrowings	$ 0		0		$ 550,000,000.0
Home equity line of credit
Allowance for credit losses
Conversion of debt			11,300,000	14,900,000
Commercial
Allowance for credit losses
Conversion of debt			1,900,000	2,000,000.0
Consumer
Allowance for credit losses
Conversion of debt			$ 400,000	$ 900,000

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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.

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-Name Accounting Standards Codification
-Section 45
-Paragraph 1
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Unused amount of commitments to extend credit to customers.

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