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Bank subsidiary (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Net income $ 48,177 $ 48,875 $ 126,239 $ 105,422
Net unrealized losses on securities:        
Net unrealized gains on securities arising during the period, net of taxes of $689 and $1,917 for the three months ended September 30, 2012 and 2011 and $1,261 and $4,258 for the nine months ended September 30, 2012 and 2011, respectively 1,043 3,013 1,910 6,448
Net unrealized gains on securities arising during the period, taxes 689 1,917 1,261 4,258
Less: reclassification adjustment for net realized gains included in net income, net of taxes of nil and $146 for the three months ended September 30, 2012 and 2011 and $53 and $148 for the nine months ended September 30, 2012 and 2011, respectively   (221) (81) (224)
Less: reclassification adjustment for net realized gains included in net income, taxes    146 53 148
Retirement benefit plans:        
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, net of tax benefits of $2,443 and $1,405 for the three months ended September 30, 2012 and 2011 and $7,321 and $3,513 for the nine months ended September 30, 2012 and 2011, respectively 3,826 2,068 11,467 5,556
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax (tax benefits) (2,443) (1,405) (7,321) (3,513)
Other comprehensive income, net of taxes 1,586 3,181 3,447 5,810
Comprehensive income 49,292 51,585 128,269 109,815
American Savings Bank (ASB)
        
Net income 14,208 15,457 44,274 44,503
Net unrealized losses on securities:        
Net unrealized gains on securities arising during the period, net of taxes of $689 and $1,917 for the three months ended September 30, 2012 and 2011 and $1,261 and $4,258 for the nine months ended September 30, 2012 and 2011, respectively 1,043 3,013 1,910 6,448
Net unrealized gains on securities arising during the period, taxes 689 1,917 1,261 4,258
Less: reclassification adjustment for net realized gains included in net income, net of taxes of nil and $146 for the three months ended September 30, 2012 and 2011 and $53 and $148 for the nine months ended September 30, 2012 and 2011, respectively   (221) (81) (224)
Less: reclassification adjustment for net realized gains included in net income, taxes   146 53 148
Retirement benefit plans:        
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, net of tax benefits of $2,443 and $1,405 for the three months ended September 30, 2012 and 2011 and $7,321 and $3,513 for the nine months ended September 30, 2012 and 2011, respectively 266 86 769 (1,367)
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax (tax benefits) (176) (175) (508) 902
Other comprehensive income, net of taxes 1,309 2,878 2,598 4,857
Comprehensive income $ 15,517 $ 18,335 $ 46,872 $ 49,360