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Bank segment - Comprehensive income data (Details) - USD ($) $ in Thousands | 3 Months Ended
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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

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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