Bank segment (HEI only) - Credit Risk Profile Based on Payment Activity for Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Credit risk profile based on payment activity for loans
Total financing receivables	$ 5,221,204	$ 5,345,226
Recorded investment> 90 days and accruing	0	0
Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	793,304	936,748
Recorded investment> 90 days and accruing	0	0
Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	113,966	168,733
Recorded investment> 90 days and accruing	0	0
Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	2,299,212	2,144,239
Recorded investment> 90 days and accruing	0	0
Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,056,982	983,865
Recorded investment> 90 days and accruing	0	0
Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	835,663	963,578
Recorded investment> 90 days and accruing	0	0
Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	19,859	15,617
Recorded investment> 90 days and accruing	0	0
Commercial construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	91,080	121,424
Recorded investment> 90 days and accruing	0	0
Residential construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	11,138	11,022
Recorded investment> 90 days and accruing	0	0
30-59 days past due
Credit risk profile based on payment activity for loans
Total financing receivables	5,703	7,394
30-59 days past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	700	608
30-59 days past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	1,375	2,605
30-59 days past due | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	3,019	2,629
30-59 days past due | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
30-59 days past due | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	609	850
30-59 days past due | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	702
30-59 days past due | Commercial construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
30-59 days past due | Residential construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
60-89 days past due
Credit risk profile based on payment activity for loans
Total financing receivables	2,749	5,411
60-89 days past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	313	300
60-89 days past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	882	1,491
60-89 days past due | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,468	2,790
60-89 days past due | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	488
60-89 days past due | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	86	342
60-89 days past due | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
60-89 days past due | Commercial construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
60-89 days past due | Residential construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
Greater than 90 days
Credit risk profile based on payment activity for loans
Total financing receivables	8,792	6,830
Greater than 90 days | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	48	132
Greater than 90 days | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	941	1,631
Greater than 90 days | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	6,072	2,715
Greater than 90 days | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
Greater than 90 days | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,334	2,052
Greater than 90 days | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	397	300
Greater than 90 days | Commercial construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
Greater than 90 days | Residential construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
Total past due
Credit risk profile based on payment activity for loans
Total financing receivables	17,244	19,635
Total past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	1,061	1,040
Total past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	3,198	5,727
Total past due | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	10,559	8,134
Total past due | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	488
Total past due | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	2,029	3,244
Total past due | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	397	1,002
Total past due | Commercial construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
Total past due | Residential construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
Current
Credit risk profile based on payment activity for loans
Total financing receivables	5,203,960	5,325,591
Current | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	792,243	935,708
Current | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	110,768	163,006
Current | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	2,288,653	2,136,105
Current | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,056,982	983,377
Current | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	833,634	960,334
Current | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	19,462	14,615
Current | Commercial construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	91,080	121,424
Current | Residential construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	$ 11,138	$ 11,022