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Bank segment - Reconciliation of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Condensed Income Statements, Captions [Line Items]    
Total revenues $ 661,615 $ 645,874
Less: Retirement defined benefits gain (expense)—other than service costs (763) (1,833)
Total expenses 583,678 573,985
Operating income 77,937 71,889
Income before income taxes 58,039 53,276
American Savings Bank (ASB)    
Condensed Income Statements, Captions [Line Items]    
Interest and dividend income 68,488 62,002
Total noninterest income 14,564 13,417
Total revenues 83,052 75,419
Total interest expense 4,780 3,453
Provision for loan losses 6,870 3,541
Noninterest expense 45,240 43,925
Less: Retirement defined benefits gain (expense)—other than service costs (40) 387
Total expenses 56,930 50,532
Operating income 26,122 24,887
Income before income taxes $ 26,162 $ 24,500