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Fair value measurements Additional Information (Details) - American Savings Bank (ASB) - USD ($) $ in Millions | Dec. 31, 2014 | Dec. 31, 2013
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Carrying or notional amount |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Notional amount of loans serviced | $ 1,400.0 | $ 1,400.0
Estimated fair value |  |
Fair value measurements on a recurring and nonrecurring basis |  |
Servicing rights on loans | $ 14.5 | $ 15.7

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- Definition Represents the aggregate principal amount of loans serviced on behalf of others. + References No definition available. + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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