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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Allowance for uncollectible accounts – electric utility | Hawaiian Electric Company, Inc. and Subsidiaries      
Valuation and qualifying accounts      
Balance at beginning of period $ 1,959 $ 2,329 $ 2,148
Charged to costs and expenses 3,653 1,384 3,812
Charged to other accounts 977 1,613 1,943
Deductions 4,890 3,367 5,574
Balance at end of period 1,699 1,959 2,329
Allowance for uncollectible interest – bank | Bank      
Valuation and qualifying accounts      
Balance at beginning of period 1,514 1,661 3,166
Charged to other accounts 165 0 0
Deductions 0 147 1,505
Balance at end of period 1,679 1,514 1,661
Allowance for losses for loans receivable – bank | Bank      
Valuation and qualifying accounts      
Balance at beginning of period 45,618 40,116 41,985
Charged to costs and expenses 6,275 6,126 1,507
Charged to other accounts 4,571 4,926 4,826
Deductions 6,426 5,550 8,202
Balance at end of period 50,038 45,618 40,116
Allowance for mortgage-servicing assets – bank | Bank      
Valuation and qualifying accounts      
Balance at beginning of period 209 251 498
Charged to costs and expenses 0 53 0
Charged to other accounts (205) 0 (60)
Deductions 4 95 187
Balance at end of period 0 209 251
Deferred tax valuation allowance – HEI      
Valuation and qualifying accounts      
Balance at beginning of period 45 278 278
Charged to costs and expenses 9 17 0
Charged to other accounts 0 0 0
Deductions 0 250 0
Balance at end of period $ 54 $ 45 $ 278