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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 - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Prepayment rate:    
25 basis points adverse rate change $ (561) $ (757)
50 basis points adverse rate change (1,104) (1,524)
Discount rate:    
25 basis points adverse rate change (111) (140)
50 basis points adverse rate change (220) (278)
American Savings Bank (ASB)    
Loans receivable    
Unpaid principal balance $ 1,097,314 $ 1,391,030
Weighted average note rate 4.05% 4.07%
Weighted average discount rate 9.60% 9.60%
Weighted average prepayment speed 9.30% 9.50%