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Bank segment - Reconciliation of income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Condensed Income Statements, Captions [Line Items]        
Less: Gain on sale of investment securities, net $ 0 $ 0 $ 8,123 $ 528
Revenues 1,042,197 756,904 2,722,872 2,080,107
Less: Retirement defined benefits credit—other than service costs (1,039) (1,058) (3,528) (4,709)
Total expenses 940,082 659,588 2,434,813 1,782,904
Operating income - bank 102,115 97,316 288,059 297,203
Income before income taxes 79,905 78,151 233,602 241,291
American Savings Bank (ASB)        
Condensed Income Statements, Captions [Line Items]        
Interest and dividend income 68,417 61,441 191,228 182,127
Noninterest income 12,994 14,767 41,624 49,000
Less: Gain on sale of real estate 0 0 1,002 0
Less: Gain on sale of investment securities, net 0 0 0 528
Revenues 81,411 76,208 231,850 230,599
Total interest expense 2,759 1,181 4,771 3,974
Provision for credit losses (186) (1,725) (692) (22,367)
Noninterest expense 51,557 51,511 149,168 147,185
Less: Retirement defined benefits credit—other than service costs (181) (184) (552) (1,648)
Total expenses 54,311 51,151 152,797 130,440
Operating income - bank 27,100 25,057 79,053 100,159
Income before income taxes $ 27,281 $ 25,241 $ 79,605 $ 102,335