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Bank segment - Reconciliation of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Condensed Income Statements, Captions [Line Items]        
Revenues $ 895,685 $ 895,607 $ 1,823,922 $ 1,680,675
Less: Retirement defined benefits credit—other than service costs (1,153) (1,246) (2,305) (2,489)
Total expenses 802,706 808,939 1,637,425 1,494,731
Operating income - bank 92,979 86,668 186,497 185,944
Income before income taxes 69,367 66,217 139,671 153,697
American Savings Bank (ASB)        
Condensed Income Statements, Captions [Line Items]        
Interest and dividend income 81,741 62,822 161,220 122,811
Noninterest income 15,639 12,502 30,017 28,630
Less: Gain on sale of real estate 495 0 495 1,002
Revenues 96,885 75,324 190,742 150,439
Total interest expense 18,513 1,060 33,071 2,012
Provision for credit losses 43 2,757 1,218 (506)
Noninterest expense 53,769 49,398 108,186 97,611
Less: Retirement defined benefits credit—other than service costs (187) (186) (374) (371)
Total expenses 72,017 53,401 142,354 98,486
Operating income - bank 24,868 21,923 48,388 51,953
Income before income taxes $ 25,055 $ 22,109 $ 48,762 $ 52,324