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Bank segment - Comprehensive income data (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Condensed Statement of Income Captions [Line Items]    
Net income $ 32,825 $ 32,339
Net unrealized gains (losses) on securities:    
Net unrealized gains on available-for-sale investment securities arising during the period, net of tax benefits of $4,905 and $2,278 for the respective periods 7,428 3,451
Retirement benefit plans:    
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $137 and $259 for the respective periods 3,538 5,459
Other comprehensive income, net of taxes 8,800 4,058
Comprehensive income 41,152 35,924
Net unrealized gains (losses) on securities arising during the period, taxes 4,905 2,278
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits 2,257 3,486
American Savings Bank (ASB)    
Condensed Statement of Income Captions [Line Items]    
Net income 12,673 13,475
Net unrealized gains (losses) on securities:    
Net unrealized gains on available-for-sale investment securities arising during the period, net of tax benefits of $4,905 and $2,278 for the respective periods 7,429 3,451
Retirement benefit plans:    
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits of $137 and $259 for the respective periods 208 392
Other comprehensive income, net of taxes 7,637 3,843
Comprehensive income 20,310 17,318
Net unrealized gains (losses) on securities arising during the period, taxes (4,905) (2,278)
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits $ 137 $ 259