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Fair value measurements Additional Information (Details) - American Savings Bank (ASB) - USD ($) $ in Millions	Dec. 31, 2014	Dec. 31, 2013
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

X

- Definition

Represents the aggregate principal amount of loans serviced on behalf of others.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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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

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