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Bank segment - Narrative (Details)	1 Months Ended		9 Months Ended
	Nov. 30, 2022 security	Oct. 31, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Allowance for credit losses
Securities sold under agreements to repurchase			$ 284,000,000		$ 88,000,000
American Savings Bank (ASB)
Allowance for credit losses
Advances from the FHLB			125,000,000		0
Securities sold under agreements to repurchase			$ 284,000,000		$ 88,300,000
Minimum benchmark percentage of loan to appraisal ratio which mortgage insurance is required			80.00%
Minimum benchmark percentage of loan to appraisal ratio on non-owner occupied residential property			75.00%
American Savings Bank (ASB) | Subsequent Event
Allowance for credit losses
Number of available-for-sale investment securities transferred | security	66
Available-for-sale and held-to-maturity, fair value		$ 755,000,000
Gross realized losses on available-for-sale securities		$ 206,000,000
Home equity line of credit
Allowance for credit losses
Conversion of debt			$ 12,900,000	$ 13,600,000
Commercial
Allowance for credit losses
Conversion of debt			1,600,000	1,600,000
Consumer
Allowance for credit losses
Conversion of debt			$ 2,700,000	$ 1,900,000

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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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