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Bank segment - Mortgage servicing rights (Details) - American Savings Bank (ASB) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($)
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |
Repurchase reserve |  |  |  |  | $ 100 |  | $ 100
Mortgage service fees | $ 800 | $ 700 | $ 1,500 | $ 1,500 |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |
Servicing asset - beginning balance |  |  | 8,639 |  |  |  |
Servicing asset - ending balance | 8,509 |  | 8,509 |  |  |  |
Residential loan |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |
Proceeds from sale of mortgage loans | 44,300 | 39,300 | 77,400 | 79,900 |  |  |
Gain on sale of mortgage loans | 600 | 600 | 1,200 | 1,400 |  |  |
Servicing contracts |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |
Gross carrying amount |  |  |  |  | 18,238 | $ 17,511 |
Accumulated amortization |  |  |  |  | (9,729) | (8,872) |
Valuation allowance | 0 | 0 | 0 | 0 | 0 | 0 | 0
Net carrying amount |  |  |  |  | 8,509 | 8,639 | $ 9,181
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |
Servicing asset - beginning balance | 8,541 | 9,294 | 8,639 | 9,373 |  |  |
Amount capitalized | 392 | 362 | 727 | 798 |  |  |
Amortization | (424) | (475) | (857) | (990) |  |  |
Other-than-temporary impairment | 0 | 0 | 0 | 0 |  |  |
Servicing asset - ending balance | 8,509 | 9,181 | 8,509 | 9,181 |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |
Valuation allowance, beginning balance | 0 | 0 | 0 | 0 |  |  |
Provision (recovery) | 0 | 0 | 0 | 0 |  |  |
Other-than-temporary impairment | 0 | 0 | 0 | 0 |  |  |
Valuation allowance, ending balance | $ 0 | $ 0 | $ 0 | $ 0 |  |  |
Unpaid principal balance |  |  |  |  | 1,192,901 | 1,195,454 |
Prepayment rate: |  |  |  |  |  |  |
25 basis points adverse rate change |  |  |  |  | (344) | (869) |
50 basis points adverse rate change |  |  |  |  | (797) | (1,828) |
Discount rate: |  |  |  |  |  |  |
25 basis points adverse rate change |  |  |  |  | (135) | (111) |
50 basis points adverse rate change |  |  |  |  | $ (268) | $ (220) |
Servicing contracts | Note rate |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |
Weighted average measurement input |  |  |  |  | 0.0396 | 0.0394 |
Servicing contracts | Discount rate |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |
Weighted average measurement input |  |  |  |  | 0.100 | 0.100 |
Servicing contracts | Prepayment speed |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |
Weighted average measurement input |  |  |  |  | 0.068 | 0.090 |
Measurement Band A |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |
Measurement band percent for risk categorization |  |  | 0.50% |  |  |  |
Measurement Band B |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |
Measurement band percent for risk categorization |  |  | 1.00% |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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