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Bank segment - Reconciliation of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Condensed Income Statements, Captions [Line Items]    
Revenues $ 897,158 $ 928,237
Less / Add back: Retirement defined benefits credit—other than service costs (1,282) (1,152)
Total expenses 820,739 834,719
Operating income - bank 76,419 93,518
Income before income taxes 54,269 70,304
American Savings Bank (ASB)    
Condensed Income Statements, Captions [Line Items]    
Interest and dividend income 87,935 79,479
Noninterest income 17,209 14,378
Revenues 105,144 93,857
Total interest expense 25,586 14,558
Provision for credit losses (2,159) 1,175
Noninterest expense 55,904 54,417
Less / Add back: Retirement defined benefits credit—other than service costs (281) (187)
Total expenses 79,612 70,337
Operating income - bank 25,532 23,520
Income before income taxes $ 25,813 $ 23,707