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Bank subsidiary Bank subsidiary (Details 14) (American Savings Bank (ASB), Mortgage Servicing Rights (MSR), USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
American Savings Bank (ASB) | Mortgage Servicing Rights (MSR)
Servicing Asset at Amortized Cost [Line Items]
Gross carrying amount	$ 26,097	$ 24,150
Accumulated amortization	(14,138)	(12,399)
Valuation allowance	(202)	(351)
Net carrying amount	11,757	11,400
Valuation Allowance [Roll Forward]
Valuation allowance, beginning balance	251	498
Provision (recovery)	(35)	(107)
Other-than-temporary impairment	(14)	(40)
Valuation allowance, ending balance	202	351
Unpaid principal balance	$ 1,382,731	$ 1,305,811
Weighted average note-rate	4.07%	4.11%
Weighted average discount rate	9.80%	9.70%
Weighted average prepayment speed	8.70%	10.80%

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- Definition

Fair Value Inputs, Stated Interest Rate

+ References

No definition available.

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Fair Value Inputs, Unpaid Principal Balance, Asset

+ References

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- Definition

Servicing Asset, Accumulated Amortization

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- Definition

Servicing Asset, Net

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- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

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- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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Amount of other-than-temporary impairment (OTTI) applied to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (a)(6)

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Reflects the estimated amount of impairment as of the balance sheet date of recognized servicing assets that are being amortized in proportion to and over the period of estimated net servicing income or loss.

+ References

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-Publisher FASB

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-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

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New provisions recoveries or charged against this account which increase or reduce the net value of servicing assets.

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