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Summary of significant accounting policies - Schedule of Income Tax Expense Related to Investment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Amounts in income taxes related to low-income housing tax credit investments      
Net benefit to income tax expense $ (44,573) $ (61,167) $ (62,807)
American Savings Bank (ASB)      
Amounts in income taxes related to low-income housing tax credit investments      
Net benefit to income tax expense (10,039) (22,252) (29,325)
Variable Interest Entity, Not Primary Beneficiary | American Savings Bank (ASB)      
Amounts in income taxes related to low-income housing tax credit investments      
Amortization recognized in the provision for income taxes (13,500) (12,000) (10,300)
Tax credits and other tax benefits recognized in the provision for income taxes 18,300 16,300 13,900
Net benefit to income tax expense $ 4,800 $ 4,300 $ 3,600