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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financial assets    
Available-for-sale investment securities, at fair value $ 906,295 $ 820,648
Financial liabilities    
Short-term borrowings—other than bank 95,485 103,063
Other bank borrowings 329,081 328,582
Carrying or notional amount    
Financial assets    
Money market funds 10 10
Available-for-sale investment securities, at fair value 906,295 820,648
Stock in Federal Home Loan Bank 11,218 10,678
Loans receivable, net 4,597,850 4,570,412
Mortgage-servicing rights 8,857 8,884
Bank-owned life insurance 138,732 138,139
Derivative assets 63,470 22,616
Financial liabilities    
Deposit liabilities 5,139,932 5,025,254
Short-term borrowings—other than bank 95,485 103,063
Other bank borrowings 329,081 328,582
Long-term debt, net—other than bank 1,578,618 1,578,368
Derivative liabilities 30,516 23,269
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets 31,335  
Financial liabilities    
The Utilities’ short-term borrowings (included in amount above) 12,998  
Long-term debt, net—other than bank 1,278,916 1,278,702
Estimated fair value    
Financial assets    
Money market funds 10 10
Available-for-sale investment securities, at fair value 906,295 820,648
Stock in Federal Home Loan Bank 11,218 10,678
Loans receivable, net 4,845,115 4,749,525
Mortgage-servicing rights 11,231 11,790
Bank-owned life insurance 138,732 138,139
Derivative assets 2,295 385
Financial liabilities    
Deposit liabilities 5,144,128 5,024,500
Short-term borrowings—other than bank 95,485 103,063
Other bank borrowings 333,743 333,392
Long-term debt, net—other than bank 1,704,567 1,669,087
Derivative liabilities 192 30
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets 1,640  
Financial liabilities    
The Utilities’ short-term borrowings (included in amount above) 12,998  
Long-term debt, net—other than bank 1,397,598 1,363,766
Estimated fair value | Level 1    
Financial assets    
Derivative assets 0 0
Financial liabilities    
Derivative liabilities 139 15
Estimated fair value | Level 2    
Financial assets    
Money market funds 10 10
Available-for-sale investment securities, at fair value 906,295 820,648
Stock in Federal Home Loan Bank 11,218 10,678
Loans receivable, net 7,938 4,639
Bank-owned life insurance 138,732 138,139
Derivative assets 2,295 385
Financial liabilities    
Deposit liabilities 5,144,128 5,024,500
Short-term borrowings—other than bank 95,485 103,063
Other bank borrowings 333,743 333,392
Long-term debt, net—other than bank 1,704,567 1,669,087
Derivative liabilities 53 15
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets 1,640  
Financial liabilities    
The Utilities’ short-term borrowings (included in amount above) 12,998  
Long-term debt, net—other than bank 1,397,598 1,363,766
Estimated fair value | Level 3    
Financial assets    
Loans receivable, net 4,837,177 4,744,886
Mortgage-servicing rights $ 11,231 $ 11,790