Bank segment (HEI only) Key Assumptions Used in Estimating the Fair Value of ASB's Mortgage Servicing Rights (Details) - Mortgage Servicing Rights (MSR) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Prepayment rate:
25 basis points adverse rate change	$ (757)	$ (732)
50 basis points adverse change	(1,524)	(1,492)
Discount rate:
25 basis points adverse rate change	(140)	(154)
50 basis points adverse change	(278)	(306)
American Savings Bank (ASB)
Loans receivable
Unpaid principal balance	$ 1,391,030	$ 1,357,003
Weighted average note rate	4.07%	4.07%
Weighted average discount rate	9.60%	9.80%
Weighted average prepayment speed	9.50%	8.60%