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Bank segment - Comprehensive income data (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income | $ 51,144 | $ 48,279 | $ 118,974 | $ 136,293
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 $(2,543), $1,094, $(2,382) and $(2,249) for the respective periods | 3,851 | (1,657) | 3,608 | 3,406
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 $249, $138, $763 and $424 for the respective periods | 5,611 | 2,829 | 16,850 | 8,515
Other comprehensive income (loss), net of taxes | 4,430 | (1,311) | 5,361 | 2,756
Comprehensive income | 55,103 | 46,497 | 122,918 | 137,632
Net unrealized gains (losses) on securities arising during the period, taxes | (2,543) | 1,094 | (2,382) | (2,249)
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 | 3,583 | 1,900 | 10,760 | 5,438
American Savings Bank (ASB) |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |
Net income | 13,451 | 13,253 | 39,777 | 39,188
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 $(2,543), $1,094, $(2,382) and $(2,249) for the respective periods | 3,851 | (1,657) | 3,608 | 3,406
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 $249, $138, $763 and $424 for the respective periods | 376 | 208 | 1,155 | 642
Other comprehensive income (loss), net of taxes | 4,227 | (1,449) | 4,763 | 2,333
Comprehensive income | 17,678 | 11,804 | 44,540 | 41,521
Net unrealized gains (losses) on securities arising during the period, taxes | 2,543 | (1,094) | 2,382 | 2,249
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 | $ 249 | $ 138 | $ 763 | $ 424

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