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Bank segment - Mortgage servicing rights (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Valuation Allowance [Roll Forward] |  |  |  |  |  |
Weighted average discount rate | 3.262% |  |  |  |  |
American Savings Bank (ASB) |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
Repurchase reserve |  |  |  | $ 100 |  | $ 100
Mortgage service fees | $ 700 | $ 800 |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |
Servicing asset - beginning balance | 8,639 |  |  |  |  |
Servicing asset - ending balance | 8,541 |  | $ 8,639 |  |  |
American Savings Bank (ASB) | Mortgage Servicing Rights (MSR) |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
Gross carrying amount |  |  |  | 17,846 | $ 17,511 |
Accumulated amortization |  |  |  | (9,305) | (8,872) |
Valuation allowance | 0 | 0 | 0 | 0 | 0 | 0
Net carrying amount |  |  |  | 8,541 | 8,639 | $ 9,294
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |
Servicing asset - beginning balance | 8,639 | 9,373 | 9,373 |  |  |
Amount capitalized | 335 | 436 |  |  |  |
Amortization | (433) | (515) |  |  |  |
Other-than-temporary impairment | 0 | 0 |  |  |  |
Servicing asset - ending balance | 8,541 | 9,294 | 8,639 |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |
Valuation allowance, beginning balance | 0 | 0 | 0 |  |  |
Provision (recovery) | 0 | 0 |  |  |  |
Other-than-temporary impairment | 0 | 0 |  |  |  |
Valuation allowance, ending balance | $ 0 | 0 | $ 0 |  |  |
Unpaid principal balance |  |  |  | 1,184,160 | 1,195,454 |
Weighted average note-rate | 3.94% |  | 3.94% |  |  |
Weighted average discount rate | 10.00% |  | 10.00% |  |  |
Weighted average prepayment speed | 7.10% |  | 9.00% |  |  |
Prepayment rate: |  |  |  |  |  |
25 basis points adverse rate change |  |  |  | (378) | (869) |
50 basis points adverse rate change |  |  |  | (883) | (1,828) |
Discount rate: |  |  |  |  |  |
25 basis points adverse rate change |  |  |  | (127) | (111) |
50 basis points adverse rate change |  |  |  | $ (252) | $ (220) |
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% |  |  |  |  |
American Savings Bank (ASB) | Residential loan |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |
Proceeds from sale of mortgage loans | $ 33,100 | 40,600 |  |  |  |
Gain on sale of mortgage loans | $ 600 | $ 800 |  |  |  |

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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 The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3461-108585 + 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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