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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2020
Valuation and qualifying accounts          
Bad debt expenses deferred to regulatory assets $ 16,700        
Total liabilities and shareholders’ equity (15,004,007) $ (13,745,251)     $ (13,745,251)
Reclassifications of allowance from one customer account into long term assets     $ (4,934) $ (4,934)  
Impact of ASU No. 2016-13          
Valuation and qualifying accounts          
Total liabilities and shareholders’ equity         $ 19,441
Hawaiian Electric Company, Inc. and Subsidiaries          
Valuation and qualifying accounts          
Total liabilities and shareholders’ equity (6,457,373) (6,388,682)      
Bank          
Valuation and qualifying accounts          
Total liabilities and shareholders’ equity (8,396,533) (7,233,017)      
Allowance for uncollectible accounts – electric utility | Hawaiian Electric Company, Inc. and Subsidiaries          
Valuation and qualifying accounts          
Balance at beginning of period 1,377 1,480 1,178    
Charged to costs and expenses 2,100 2,106 2,474    
Charged to other accounts 18,041 795 (4,099)    
Deductions 3,709 3,004 (1,927)    
Balance at end of period 17,809 1,377 1,480 1,178  
Allowance for credit losses for loans – bank | Bank          
Valuation and qualifying accounts          
Balance at beginning of period 72,796 52,119 53,637    
Charged to costs and expenses 49,811 23,480 14,745    
Charged to other accounts 4,748 6,418 4,254    
Deductions 26,154 28,662 20,517    
Balance at end of period 101,201 72,796 52,119 53,637  
Allowance for credit losses for loans – bank | Bank | Previously Reported          
Valuation and qualifying accounts          
Balance at beginning of period $ 53,355        
Balance at end of period   53,355      
Deferred tax valuation allowance – HEI          
Valuation and qualifying accounts          
Balance at beginning of period   $ 0 38    
Charged to costs and expenses     0    
Charged to other accounts     0    
Deductions     38    
Balance at end of period     $ 0 $ 38