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Bank segment - Reconciliation of income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Condensed Income Statements, Captions [Line Items]    
Revenues $ 928,237 $ 785,068
Less: Retirement defined benefits credit—other than service costs (1,152) (1,243)
Total expenses 834,719 685,792
Operating income - bank 93,518 99,276
Income before income taxes 70,304 87,480
American Savings Bank (ASB)    
Condensed Income Statements, Captions [Line Items]    
Interest and dividend income 79,479 59,989
Noninterest income 14,378 16,128
Less: Gain on sale of real estate 0 1,002
Revenues 93,857 75,115
Total interest expense 14,558 952
Provision for credit losses 1,175 (3,263)
Noninterest expense 54,417 48,213
Less: Retirement defined benefits credit—other than service costs (187) (185)
Total expenses 70,337 45,085
Operating income - bank 23,520 30,030
Income before income taxes $ 23,707 $ 30,215