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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Valuation and qualifying accounts      
Reclassifications of allowance from one customer account into long term assets $ 841 $ 1,790 $ 2,303
Allowance for uncollectible accounts – electric utility | Hawaiian Electric Company, Inc. and Subsidiaries      
Valuation and qualifying accounts      
Balance at beginning of period 1,121 1,699 1,959
Charged to costs and expenses 1,810 2,383 3,653
Charged to other accounts 785 877 977
Deductions 2,538 3,838 4,890
Balance at end of period 1,178 1,121 1,699
Allowance for uncollectible interest – bank | Bank      
Valuation and qualifying accounts      
Balance at beginning of period 1,834 1,679 1,514
Charged to costs and expenses 0 0 0
Charged to other accounts 0 155 165
Deductions 1,467 0 0
Balance at end of period 367 1,834 1,679
Allowance for losses for loans receivable – bank | Bank      
Valuation and qualifying accounts      
Balance at beginning of period 55,533 50,038 45,618
Charged to costs and expenses 10,901 16,763 6,275
Charged to other accounts 4,016 2,977 4,571
Deductions 16,813 14,245 6,426
Balance at end of period 53,637 55,533 50,038
Allowance for mortgage-servicing assets – bank | Bank      
Valuation and qualifying accounts      
Balance at beginning of period   0 209
Charged to costs and expenses     0
Charged to other accounts     (205)
Deductions     4
Balance at end of period     0
Deferred tax valuation allowance – HEI      
Valuation and qualifying accounts      
Balance at beginning of period 38 54 45
Charged to costs and expenses 0 0 9
Charged to other accounts 0 0 0
Deductions 38 16 0
Balance at end of period $ 0 $ 38 $ 54