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Fair value measurements - Summary of financial assets and liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financial assets    
Available-for-sale investment securities $ 996,984 $ 820,648
Financial liabilities    
Short-term borrowings—other than bank 0 103,063
Other bank borrowings 265,388 328,582
Carrying or notional amount    
Financial assets    
Money market funds 45,030 10
Available-for-sale investment securities 996,984 820,648
Stock in Federal Home Loan Bank 11,218 10,678
Loans receivable, net 4,702,644 4,570,412
Mortgage-servicing rights 9,191 8,884
Bank-owned life insurance 141,262 138,139
Derivative assets 62,581 22,616
Financial liabilities    
Deposit liabilities 5,380,721 5,025,254
Short-term borrowings—other than bank   103,063
Other bank borrowings 265,388 328,582
Long-term debt, net—other than bank 1,579,065 1,578,368
Derivative liabilities 42,344 23,269
Carrying or notional amount | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets 20,725  
Financial liabilities    
Long-term debt, net—other than bank 1,279,327 1,278,702
Estimated fair value    
Financial assets    
Money market funds 45,030 10
Available-for-sale investment securities 996,984 820,648
Stock in Federal Home Loan Bank 11,218 10,678
Loans receivable, net 4,950,241 4,749,525
Mortgage-servicing rights 10,971 11,790
Bank-owned life insurance 141,262 138,139
Derivative assets 1,508 385
Financial liabilities    
Deposit liabilities 5,384,924 5,024,500
Short-term borrowings—other than bank   103,063
Other bank borrowings 267,892 333,392
Long-term debt, net—other than bank 1,741,707 1,669,087
Derivative liabilities 164 30
Estimated fair value | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets 664  
Financial liabilities    
Long-term debt, net—other than bank 1,432,766 1,363,766
Estimated fair value | Level 1    
Financial assets    
Money market funds 0 0
Available-for-sale investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans receivable, net 0 0
Mortgage-servicing rights 0 0
Bank-owned life insurance 0 0
Derivative assets 0 0
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings—other than bank   0
Other bank borrowings 0 0
Long-term debt, net—other than bank 0 0
Derivative liabilities 121 15
Estimated fair value | Level 1 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets 0  
Financial liabilities    
Long-term debt, net—other than bank 0 0
Estimated fair value | Level 2    
Financial assets    
Money market funds 45,030 10
Available-for-sale investment securities 996,984 820,648
Stock in Federal Home Loan Bank 11,218 10,678
Loans receivable, net 26,784 4,639
Mortgage-servicing rights 0 0
Bank-owned life insurance 141,262 138,139
Derivative assets 1,508 385
Financial liabilities    
Deposit liabilities 5,384,924 5,024,500
Short-term borrowings—other than bank   103,063
Other bank borrowings 267,892 333,392
Long-term debt, net—other than bank 1,741,707 1,669,087
Derivative liabilities 43 15
Estimated fair value | Level 2 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets 664  
Financial liabilities    
Long-term debt, net—other than bank 1,432,766 1,363,766
Estimated fair value | Level 3    
Financial assets    
Money market funds 0 0
Available-for-sale investment securities 0 0
Stock in Federal Home Loan Bank 0 0
Loans receivable, net 4,923,457 4,744,886
Mortgage-servicing rights 10,971 11,790
Bank-owned life insurance 0 0
Derivative assets 0 0
Financial liabilities    
Deposit liabilities 0 0
Short-term borrowings—other than bank   0
Other bank borrowings 0 0
Long-term debt, net—other than bank 0 0
Derivative liabilities 0 0
Estimated fair value | Level 3 | Hawaiian Electric Company, Inc. and Subsidiaries    
Financial assets    
Derivative assets 0  
Financial liabilities    
Long-term debt, net—other than bank $ 0 $ 0