Bank segment (HEI only) - Balance Sheets Data (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and cash equivalents	$ 199,877	$ 305,551	$ 341,421
Investment securities
Available-for-sale investment securities	1,429,667	2,574,618
Held-to-maturity investment securities, at amortized cost	1,251,747	522,270
Held-to-maturity investment securities	1,150,971
Stock in Federal Home Loan Bank, at cost	26,560	10,000
Allowance for credit losses	(72,216)	(71,130)	(101,201)	$ (53,355)
Total loans, net	5,906,690	5,139,984
Loans held for sale, at lower of cost or fair value	824	10,404
Other	824,536	747,469
Goodwill	82,190	82,190
Total assets	16,284,244	15,822,637	15,004,007
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other	787,057	669,215
Total liabilities	14,047,452	13,397,460
Commitments and contingencies
Retained earnings	845,830	757,921
Accumulated other comprehensive income (loss), net of taxes
Net unrealized losses on securities	(328,904)	(32,037)
Retirement benefit plans	(9,115)	(16,858)
Accumulated other comprehensive income (loss), net of taxes	(336,028)	(52,533)
Total shareholders’ equity	2,202,499	2,390,884	$ 2,337,502	$ 2,280,260
Total capitalization and liabilities	16,284,244	15,822,637
Other assets
Premises and equipment, net	5,687,003	5,392,068
Total other assets	824,536	747,469
Other liabilities
Total other liabilities	787,057	669,215
American Savings Bank (ASB)
Assets
Cash and due from banks	153,042	100,051
Interest-bearing deposits	3,107	151,189
Cash and cash equivalents	156,149	251,240
Investment securities
Available-for-sale investment securities	1,429,667	2,574,618
Held-to-maturity investment securities, at amortized cost	1,251,747	522,270
Held-to-maturity investment securities	1,150,971	510,474
Stock in Federal Home Loan Bank, at cost	26,560	10,000
Loans held for investment	5,978,906	5,211,114
Allowance for credit losses	(72,216)	(71,130)
Total loans, net	5,906,690	5,139,984
Loans held for sale, at lower of cost or fair value	824	10,404
Other	692,143	590,897
Goodwill	82,190	82,190
Total assets	9,545,970	9,181,603
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposit liabilities–noninterest-bearing	2,811,077	2,976,632
Deposit liabilities–interest-bearing	5,358,619	5,195,580
Other borrowings	695,120	88,305
Other	212,269	193,268
Total liabilities	9,077,085	8,453,785
Commitments and contingencies
Common stock	1	1
Premium on capital stock	355,806	353,895
Retained earnings	449,693	411,704
Accumulated other comprehensive income (loss), net of taxes
Net unrealized losses on securities	(328,904)	(32,037)
Retirement benefit plans	(7,711)	(5,745)
Accumulated other comprehensive income (loss), net of taxes	(336,615)	(37,782)
Total shareholders’ equity	468,885	727,818
Total capitalization and liabilities	9,545,970	9,181,603
Other assets
Bank-owned life insurance	182,986	177,566
Premises and equipment, net	195,324	202,299
Accrued interest receivable	25,077	20,854
Mortgage servicing rights	9,047	9,950
Low-income housing investments	106,978	110,989
Deferred income tax assets	116,441	7,699
Real estate acquired in settlement of loans, net	115	0
Other	56,175	61,540
Total other assets	692,143	590,897
Other liabilities
Accrued expenses	97,295	87,905
Federal income taxes payable	863	0
Cashier’s checks	36,401	33,675
Advance payments by borrowers	9,637	9,994
Other	68,073	61,694
Total other liabilities	$ 212,269	$ 193,268