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Fair value measurements (Tables)
 12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of estimated fair values of certain of the Company's financial instruments The following table presents the carrying or notional amount, fair value, and placement in the fair value hierarchy of the Company’s financial instruments. For stock in Federal Home Loan Bank, the carrying amount is a reasonable estimate of fair value because it can only be redeemed at par.
  Estimated fair value
(in thousands)Carrying or notional
amount		Quoted prices in active markets for identical assets
(Level 1)		Significant other observable inputs
(Level 2)		Significant unobservable inputs
(Level 3)		Total
December 31, 2020     
Financial assets     
HEI consolidated
Available-for-sale investment securities
$1,970,417 $— $1,943,232 $27,185 $1,970,417 
Held-to-maturity investment securities
226,947 — 229,963 — 229,963 
Stock in Federal Home Loan Bank
8,680 — 8,680 — 8,680 
Loans, net5,260,917 — 28,354 5,410,976 5,439,330 
Mortgage servicing rights10,020 — 10,705 10,705 
Derivative assets120,980 — 4,536 — 4,536 
Financial liabilities     
HEI consolidated
Deposit liabilities548,830 — 552,800 — 552,800 
Short-term borrowings—other than bank129,379 — 129,379 — 129,379 
Other bank borrowings89,670 — 89,669 — 89,669 
Long-term debt, net—other than bank2,119,129 — 2,487,790 — 2,487,790 
Derivative liabilities
137,500 500 4,530 — 5,030 
Hawaiian Electric consolidated
Short-term borrowings
49,979 — 49,979 — 49,979 
Long-term debt, net
1,561,302 — 1,890,490 — 1,890,490 
December 31, 2019     
Financial assets     
HEI consolidated
Available-for-sale investment securities
$1,232,826 $— $1,204,229 $28,597 $1,232,826 
Held-to-maturity investment securities
139,451 — 143,467 — 143,467 
Stock in Federal Home Loan Bank
8,434 — 8,434 — 8,434 
Loans, net5,080,107 — 12,295 5,145,242 5,157,537 
Mortgage servicing rights9,101 — — 12,379 12,379 
Derivative assets25,179 — 300 — 300 
Financial liabilities     
HEI consolidated
Deposit liabilities769,825 — 765,976 — 765,976 
Short-term borrowings—other than bank185,710 — 185,710 — 185,710 
Other bank borrowings115,110 — 115,107 — 115,107 
Long-term debt, net—other than bank1,964,365 2,156,927 2,156,927 
Derivative liabilities51,375 33 2,185 — 2,218 
Hawaiian Electric consolidated
Short-term borrowings
88,987 — 88,987 — 88,987 
Long-term debt, net
1,497,667 — 1,670,189 — 1,670,189 
Schedule of assets and liabilities measured at fair value on a recurring basis Assets and liabilities measured at fair value on a recurring basis were as follows:
December 3120202019
 Fair value measurements usingFair value measurements using
(in thousands)Level 1Level 2Level 3Level 1Level 2Level 3
Available-for-sale investment securities (bank segment)   
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies
$— $1,849,559 $— $— $1,026,385 $— 
U.S. Treasury and federal agency obligations— 62,322 — — 117,787 — 
Corporate bonds— 31,351 — — 60,057 — 
Mortgage revenue bonds— — 27,185 — — 28,597 
 $— $1,943,232 $27,185 $— $1,204,229 $28,597 
Derivative assets
Interest rate lock commitments (bank segment)1
$— $4,536 $— $— $297 $— 
Forward commitments (bank segment)1
— — — — 3 — 
$— $4,536 $— $— $300 $— 
Derivative liabilities
Forward commitments (bank segment)1
$500 $— $— $33 $12 $— 
Interest rate swap (Other segment)2
— 4,530 — — 2,173 — 
$500 $4,530 $— $33 $2,185 $— 
1 Derivatives are carried at fair value in other assets or other liabilities in the balance sheets with changes in value included in mortgage banking income.
2    Derivatives are included in Other liabilities in the balance sheets.
Schedule of Level 3 assets and liabilities measured at fair value on a recurring basis
The changes in Level 3 assets and liabilities measured at fair value on a recurring basis were as follows:
(in thousands)20202019
Mortgage revenue bonds
Balance, January 1$28,597 $23,636 
Principal payments received(1,641)— 
Purchases229 4,961 
Unrealized gain (loss) included in other comprehensive income— — 
Balance, December 31$27,185 $28,597 
Schedule of assets measured at fair value on a nonrecurring basis The carrying value of assets measured at fair value on a nonrecurring basis were as follows:
  Fair value measurements using
(in thousands)BalanceLevel 1Level 2Level 3
December 31, 2020    
Loans$387 $— $— $387 
Mortgage servicing rights3,001 — — 3,001 
December 31, 2019
Loans25 — — 25 
Schedule of significant unobservable inputs used in the fair value measurement
Key assumptions used in estimating the fair value of ASB’s MSRs used in the impairment analysis were as follows:
December 3120202019
(dollars in thousands)
Unpaid principal balance$1,450,312 $1,276,437 
Weighted average note rate3.68 %3.96 %
Weighted average discount rate9.25 %9.25 %
Weighted average prepayment speed17.7 %11.4 %
The following table presents quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis:
Significant unobservable
 input value (1)
(dollars in thousands)Fair valueValuation techniqueSignificant unobservable inputRangeWeighted
Average
December 31, 2020
Commercial loan$387 Fair value of collateralAppraised value less selling costN/A (2)N/A (2)
Mortgage servicing rights$3,001 Discounted cash flowPrepayment speed
15-22%
22%
Discount rate9.3%
December 31, 2019
Residential land$25 Fair value of collateralAppraised value less selling costN/A (2)N/A (2)
(1)    Represent percent of outstanding principal balance.
(2) N/A - Not applicable. There is one asset in each fair value measurement type.