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Bank segment - Mortgage servicing rights (Details) - American Savings Bank (ASB) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2015 USD ($) loan | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($)
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |  |  |
Mortgage service fees |  | $ 900 | $ 900 | $ 2,700 | $ 2,600 |  |  |  |
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |
Servicing Asset at Amortized Cost | $ 12,258 |  |  | 11,540 |  |  |  |  |
Servicing Asset at Amortized Cost |  | 12,258 |  | 12,258 |  | $ 11,540 |  |  |
Mortgage Servicing Rights (MSR) |  |  |  |  |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |  |  |  |  |
Gross carrying amount |  |  |  |  |  |  | $ 29,818 |  | $ 26,685
Accumulated amortization |  |  |  |  |  |  | (17,560) |  | (15,003)
Valuation allowance | 0 | 0 | (158) | (209) | (251) | (251) | 0 | $ (209) | (158)
Net carrying amount |  |  |  |  |  |  | 12,258 |  | $ 11,524
Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |
Servicing Asset at Amortized Cost | 12,258 |  |  | 11,749 | 11,938 | 11,938 |  |  |
Servicing Asset at Amortized Value, Amount Capitalized |  |  |  | 2,636 | 1,098 |  |  |  |
Servicing Asset at Amortized Cost, Amortization |  |  |  | (2,123) | (1,297) |  |  |  |
Other-than-temporary impairment |  |  |  | (4) | (57) |  |  |  |
Servicing Asset at Amortized Cost |  | 12,258 | 11,682 | 12,258 | 11,682 | 11,749 |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |  |  |
Valuation allowance, beginning balance | $ 0 |  |  | 209 | 251 | 251 |  |  |
Provision (recovery) |  |  |  | (205) | (36) |  |  |  |
Other-than-temporary impairment |  |  |  | (4) | (57) |  |  |  |
Valuation allowance, ending balance |  | $ 0 | $ 158 | $ 0 | $ 158 | $ 209 |  |  |
Unpaid principal balance |  |  |  |  |  |  | 1,503,369 | 1,391,030 |
Weighted average note-rate |  |  |  | 4.01% |  | 4.07% |  |  |
Weighted average discount rate |  |  |  | 9.50% |  | 9.60% |  |  |
Weighted average prepayment speed |  |  |  | 9.90% |  | 9.50% |  |  |
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 25 Basis Point Adverse Change in Prepayment Speed |  |  |  |  |  |  | (832) | (757) |
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 Basis Point Adverse Change in Prepayment Speed |  |  |  |  |  |  | (1,643) | (1,524) |
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 25 Basis Points Adverse Change in Discount Rate |  |  |  |  |  |  | (148) | (140) |
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 50 Basis Points Adverse Change in Discount Rate |  |  |  |  |  |  | $ (293) | $ (278) |
Mortgage Servicing Rights (MSR) | Residential loan | Subsequent Event |  |  |  |  |  |  |  |  |
Valuation Allowance [Roll Forward] |  |  |  |  |  |  |  |  |
Mortgage servicing rights, underlying loans disposed | loan | 1,500 |  |  |  |  |  |  |  |
Unpaid principal balance of loans | $ 419,000 |  |  |  |  |  |  |  |

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