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Bank segment - Comprehensive income data (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income | $ 35,491 | $ 41,754 | $ 67,830 | $ 88,014
Net unrealized gains (losses) on securities: |  |  |  |
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of (taxes) benefits of $2,439, $(1,679), $161 and $(3,343) for the respective periods | (3,694) | 2,543 | (243) | 5,063
Less: reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil, nil and $1,132 for the respective periods | 0 | 0 | 0 | (1,715)
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 $255, $142, $514 and $286 for the respective periods | 5,780 | 2,873 | 11,239 | 5,686
Other comprehensive income (loss), net of taxes | (3,127) | 2,900 | 931 | 4,067
Comprehensive income | 31,891 | 44,181 | 67,815 | 91,135
Net unrealized gains (losses) on securities arising during the period, taxes | 2,439 | (1,679) | 161 | (3,343)
Less: reclassification adjustment for net realized gains included in net income, taxes | 0 | 0 | 0 | (1,132)
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | (3,691) | (1,836) | (7,177) | (3,632)
American Savings Bank (ASB) |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income | 12,851 | 11,536 | 26,326 | 25,935
Net unrealized gains (losses) on securities: |  |  |  |
Net unrealized gains (losses) on available-for-sale investment securities arising during the period, net of (taxes) benefits of $2,439, $(1,679), $161 and $(3,343) for the respective periods | (3,694) | 2,543 | (243) | 5,063
Less: reclassification adjustment for net realized gains included in net income, net of taxes of nil, nil, nil and $1,132 for the respective periods | 0 | 0 | 0 | (1,715)
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 $255, $142, $514 and $286 for the respective periods | 387 | 215 | 779 | 434
Other comprehensive income (loss), net of taxes | (3,307) | 2,758 | 536 | 3,782
Comprehensive income | 9,544 | 14,294 | 26,862 | 29,717
Net unrealized gains (losses) on securities arising during the period, taxes | (2,439) | 1,679 | (161) | 3,343
Less: reclassification adjustment for net realized gains included in net income, taxes | 0 | 0 | 0 | 1,132
Less: amortization of prior service credit and net losses recognized during the period in net periodic benefit cost, net of tax benefits | $ (255) | $ (142) | $ (514) | $ (286)

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