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Bank segment (HEI only) - Key Assumptions Used in Estimating the Fair Value of ASB's Mortgage Servicing Rights (Details) - Allowance for mortgage-servicing assets – bank $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Prepayment rate: |  |
25 basis points adverse rate change | $ (714) | $ (738)
50 basis points adverse rate change | (1,608) | (1,445)
Discount rate: |  |
25 basis points adverse rate change | (129) | (68)
50 basis points adverse rate change | (256) | (135)
American Savings Bank (ASB) |  |
Mortgage Servicing Rights |  |
Unpaid principal balance | $ 1,481,899 | $ 1,450,312
Weighted average note rate | 3.38% | 3.68%
American Savings Bank (ASB) | Weighted average discount rate |  |
Mortgage Servicing Rights |  |
Weighted average measurement input | 0.0925 | 0.0925
American Savings Bank (ASB) | Weighted average prepayment speed |  |
Mortgage Servicing Rights |  |
Weighted average measurement input | 0.0977 | 0.1770

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- Definition Fair Value Inputs, Stated Interest Rate + References No definition available. + Details
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- Definition Fair Value Inputs, Unpaid Principal Balance, Asset + 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 Value of input used to measure servicing asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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