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Bank segment - Reconciliation of Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Condensed Income Statements, Captions [Line Items]        
Total revenues $ 768,048 $ 673,185 $ 2,099,199 $ 1,897,028
Less: Retirement defined benefits expense—other than service costs (1,276) (1,928) (4,673) (5,710)
Total expenses 669,984 561,712 1,850,447 1,638,015
Operating income 98,064 111,473 248,752 259,013
Income before income taxes 77,233 95,139 190,091 206,347
American Savings Bank (ASB)        
Condensed Income Statements, Captions [Line Items]        
Interest and dividend income 65,185 59,060 190,448 175,862
Total noninterest income 15,311 15,229 42,571 46,612
Total revenues 80,496 74,289 233,019 222,474
Total interest expense 4,039 2,914 11,169 8,968
Provision for loan losses 6,033 490 12,337 7,231
Noninterest expense 43,593 44,121 131,668 130,555
Less: Retirement defined benefits expense—other than service costs 433 212 1,223 608
Total expenses 53,232 47,313 153,951 146,146
Operating income 27,264 26,976 79,068 76,328
Income before income taxes $ 26,831 $ 26,764 $ 77,845 $ 75,720