Bank segment (HEI only) - Credit Risk Profile Based on Payment Activity for Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Credit risk profile based on payment activity for loans
Total financing receivables	$ 6,210,578	$ 6,005,021
Recorded investment> 90 days and accruing	425	0
Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	743,303	779,691
Recorded investment> 90 days and accruing	0	0
Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	272,256	254,709
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	2,595,162	2,479,637
Recorded investment> 90 days and accruing	425	0
Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,374,038	1,358,123
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	1,017,207	1,002,905
Recorded investment> 90 days and accruing	0	0
Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	18,364	20,679
Recorded investment> 90 days and accruing	0	0
Commercial construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	172,405	88,489
Recorded investment> 90 days and accruing	0	0
Residential construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	17,843	20,788
Recorded investment> 90 days and accruing	0	0
Total past due
Credit risk profile based on payment activity for loans
Total financing receivables	39,933	13,926
Total past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	542	709
Total past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	5,732	4,423
Total past due | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	18,336	5,109
Total past due | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	11,048	725
Total past due | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	3,600	2,960
Total past due | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	675	0
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
30-59 days past due
Credit risk profile based on payment activity for loans
Total financing receivables	8,712	5,959
30-59 days past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	163	614
30-59 days past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	2,567	1,979
30-59 days past due | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	4,501	1,546
30-59 days past due | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	508
30-59 days past due | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,481	1,312
30-59 days past due | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
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	8,148	2,343
60-89 days past due | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	135	18
60-89 days past due | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	1,576	1,315
60-89 days past due | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	5,165	358
60-89 days past due | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	217
60-89 days past due | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	597	435
60-89 days past due | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	675	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	23,073	5,624
Greater than 90 days | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	244	77
Greater than 90 days | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	1,589	1,129
Greater than 90 days | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	8,670	3,205
Greater than 90 days | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	11,048	0
Greater than 90 days | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,522	1,213
Greater than 90 days | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	0	0
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
Current
Credit risk profile based on payment activity for loans
Total financing receivables	6,170,645	5,991,095
Current | Commercial
Credit risk profile based on payment activity for loans
Total financing receivables	742,761	778,982
Current | Consumer
Credit risk profile based on payment activity for loans
Total financing receivables	266,524	250,286
Current | Residential 1-4 family | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	2,576,826	2,474,528
Current | Commercial real estate | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,362,990	1,357,398
Current | Home equity  line of credit | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	1,013,607	999,945
Current | Residential land | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	17,689	20,679
Current | Commercial construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	172,405	88,489
Current | Residential construction | Real estate
Credit risk profile based on payment activity for loans
Total financing receivables	$ 17,843	$ 20,788