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Bank segment - Mortgage servicing rights (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |  |
Repurchase reserve |  |  |  |  |  | $ 100,000 |  | $ 0
American Savings Bank (ASB) |  |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |  |
Mortgage service fees | $ 700,000 | $ 900,000 | $ 1,400,000 | $ 1,800,000 |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Servicing asset - beginning balance |  |  | 8,884,000 |  |  |  |  |
Servicing asset - ending balance | 9,016,000 |  | 9,016,000 |  | $ 8,884,000 |  |  |
American Savings Bank (ASB) | Residential loan |  |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of mortgage loans | 58,100,000 | 95,000,000 | 98,500,000 | 173,300,000 |  |  |  |
Gain on sale of mortgage loans | 1,500,000 | 2,100,000 | 2,700,000 | 3,900,000 |  |  |  |
American Savings Bank (ASB) | Mortgage Servicing Rights (MSR) |  |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |  |
Gross carrying amount |  |  |  |  |  | 15,652,000 | $ 14,531,000 |
Accumulated amortization |  |  |  |  |  | (6,636,000) | (5,647,000) |
Valuation allowance | 0 | (37,000) | 0 | (209,000) | (209,000) | 0 | 0 | (37,000)
Net carrying amount |  |  |  |  |  | 9,016,000 | 8,884,000 | $ 12,265,000
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Servicing asset - beginning balance |  |  | 8,884,000 | 11,749,000 | 11,749,000 |  |  |
Amount capitalized |  |  | 1,120,000 | 2,001,000 |  |  |  |
Amortization |  |  | (988,000) | (1,444,000) |  |  |  |
Other-than-temporary impairment |  |  | 0 | (4,000) |  |  |  |
Servicing asset - ending balance | 9,016,000 | 12,302,000 | 9,016,000 | 12,302,000 | 8,884,000 |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |  |
Valuation allowance, beginning balance |  |  | 0 | 209,000 | 209,000 |  |  |
Provision (recovery) |  |  | 0 | (168,000) |  |  |  |
Other-than-temporary impairment |  |  | 0 | (4,000) |  |  |  |
Valuation allowance, ending balance | $ 0 | $ 37,000 | $ 0 | $ 37,000 | $ 0 |  |  |
Unpaid principal balance |  |  |  |  |  | 1,137,226,000 | 1,097,314,000 |
Weighted average note-rate |  |  | 4.03% |  | 4.05% |  |  |
Weighted average discount rate |  |  | 9.40% |  | 9.60% |  |  |
Weighted average prepayment speed |  |  | 11.40% |  | 9.30% |  |  |
Prepayment rate - 25 points adverse rate change |  |  |  |  |  | (567,000) | (561,000) |
Prepayment rate - 50 points adverse rate change |  |  |  |  |  | (1,037,000) | (1,104,000) |
Discount rate - 25 points adverse rate change |  |  |  |  |  | (97,000) | (111,000) |
Discount rate - 50 points adverse rate change |  |  |  |  |  | $ (192,000) | $ (220,000) |
American Savings Bank (ASB) | Measurement Band A |  |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |  |
Measurement band percent for risk categorization |  |  | 0.50% |  |  |  |  |
American Savings Bank (ASB) | Measurement Band B |  |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |  |
Measurement band percent for risk categorization |  |  | 1.00% |  |  |  |  |

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- Definition Mortgage Loans on Real Estate, Repurchase Reserve + References No definition available. + Details
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- Definition Risks Inherent in Servicing Assets and Servicing Liabilities, Band Percent For Risk Categorization + References No definition available. + Details
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- Definition The hypothetical financial impact of a 25 basis point adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References No definition available. + Details
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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) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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=66048111&loc=d3e19207-110258 + Details
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- Definition Income from mortgage banking activities (fees and commissions) and servicing real estate mortgages, credit cards, and other financial assets held by others net of any related impairment of capitalized service costs. Also includes any premiums received in lieu of regular servicing fees on such loans only as earned over the life of the loans. + References No definition available. + Details
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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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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 + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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- Definition Amortized amount of 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 -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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