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Bank segment - Reconciliation of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Condensed Income Statements, Captions [Line Items]        
Less: Gain on sale of investment securities, net $ 0 $ 0 $ 528 $ 9,275
Revenues 756,904 641,427 2,080,107 1,927,558
Provision for credit losses (1,975) 14,470 (21,967) 35,204
Less: Retirement defined benefits expense (credit)—other than service costs (1,058) 1,102 (4,709) 2,970
Total expenses 659,588 541,866 1,782,904 1,696,739
Operating income - Bank 97,316 99,561 297,203 230,819
Income before income taxes 78,151 79,521 241,291 179,447
American Savings Bank (ASB)        
Condensed Income Statements, Captions [Line Items]        
Interest and dividend income 61,441 59,640 182,127 184,444
Noninterest income 14,767 19,004 49,000 57,927
Less: Gain on sale of investment securities, net 0 0 528 9,275
Revenues 76,208 78,644 230,599 233,096
Total interest expense 1,181 2,348 3,974 9,394
Provision for credit losses (1,725) 13,970 (22,367) 39,504
Noninterest expense 51,511 47,299 147,185 142,143
Less: Retirement defined benefits expense (credit)—other than service costs (184) 473 (1,648) 1,341
Total expenses 51,151 63,144 130,440 189,700
Operating income - Bank 25,057 15,500 100,159 43,396
Income before income taxes $ 25,241 $ 15,027 $ 102,335 $ 51,330