Bank segment (HEI only) - Credit Risk Profile by Internally Assigned Grade for Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Credit risk profile by internally assigned grade for loans
Current Year	$ 1,325,112	$ 1,339,586
One Year Prior of Origination Year	934,584	590,363
Two Years Prior of Origination Year	367,452	382,648
Three Years Prior of Origination Year	236,305	335,784
Four Years Prior of Origination Year	217,965	368,904
More than Five Years Prior of Origination Year	1,119,478	1,172,236
Revolving loans	958,710	1,093,287
Converted to term loans	61,598	62,418
Total	5,221,204	5,345,226
30-59 days past due
Credit risk profile by internally assigned grade for loans
Total	5,703	7,394
60-89 days past due
Credit risk profile by internally assigned grade for loans
Total	2,749	5,411
Greater than 90 days
Credit risk profile by internally assigned grade for loans
Total	8,792	6,830
Consumer
Credit risk profile by internally assigned grade for loans
Current Year	37,838	29,546
One Year Prior of Origination Year	15,889	69,325
Two Years Prior of Origination Year	30,679	38,635
Three Years Prior of Origination Year	11,506	7,646
Four Years Prior of Origination Year	352	307
More than Five Years Prior of Origination Year	238	348
Revolving loans	13,044	18,848
Converted to term loans	4,420	4,078
Total	113,966	168,733
Conversion of debt	2,700
Consumer | Current
Credit risk profile by internally assigned grade for loans
Current Year	37,563	28,818
One Year Prior of Origination Year	15,488	67,159
Two Years Prior of Origination Year	29,383	37,072
Three Years Prior of Origination Year	10,897	7,207
Four Years Prior of Origination Year	302	293
More than Five Years Prior of Origination Year	238	348
Revolving loans	12,740	18,351
Converted to term loans	4,157	3,758
Total	110,768	163,006
Consumer | 30-59 days past due
Credit risk profile by internally assigned grade for loans
Current Year	202	406
One Year Prior of Origination Year	181	1,085
Two Years Prior of Origination Year	517	727
Three Years Prior of Origination Year	234	155
Four Years Prior of Origination Year	15	4
More than Five Years Prior of Origination Year	0	0
Revolving loans	156	138
Converted to term loans	70	90
Total	1,375	2,605
Consumer | 60-89 days past due
Credit risk profile by internally assigned grade for loans
Current Year	59	191
One Year Prior of Origination Year	127	549
Two Years Prior of Origination Year	392	427
Three Years Prior of Origination Year	183	165
Four Years Prior of Origination Year	8	3
More than Five Years Prior of Origination Year	0	0
Revolving loans	7	97
Converted to term loans	106	59
Total	882	1,491
Consumer | Greater than 90 days
Credit risk profile by internally assigned grade for loans
Current Year	14	131
One Year Prior of Origination Year	93	532
Two Years Prior of Origination Year	387	409
Three Years Prior of Origination Year	192	119
Four Years Prior of Origination Year	27	7
More than Five Years Prior of Origination Year	0	0
Revolving loans	141	262
Converted to term loans	87	171
Total	941	1,631
Commercial
Credit risk profile by internally assigned grade for loans
Current Year	266,554	430,228
One Year Prior of Origination Year	124,483	148,663
Two Years Prior of Origination Year	93,137	79,496
Three Years Prior of Origination Year	58,476	40,218
Four Years Prior of Origination Year	35,915	50,326
More than Five Years Prior of Origination Year	78,497	52,133
Revolving loans	119,059	111,534
Converted to term loans	17,183	24,150
Total	793,304	936,748
Conversion of debt	1,800
Commercial | 30-59 days past due
Credit risk profile by internally assigned grade for loans
Total	700	608
Commercial | 60-89 days past due
Credit risk profile by internally assigned grade for loans
Total	313	300
Commercial | Greater than 90 days
Credit risk profile by internally assigned grade for loans
Total	48	132
Pass | Commercial
Credit risk profile by internally assigned grade for loans
Current Year	266,087	392,088
One Year Prior of Origination Year	96,963	117,791
Two Years Prior of Origination Year	79,329	75,533
Three Years Prior of Origination Year	56,497	29,211
Four Years Prior of Origination Year	31,019	12,520
More than Five Years Prior of Origination Year	66,570	35,770
Revolving loans	96,673	74,520
Converted to term loans	15,510	11,004
Total	708,648	748,437
Special Mention | Commercial
Credit risk profile by internally assigned grade for loans
Current Year	40	37,836
One Year Prior of Origination Year	27,336	23,087
Two Years Prior of Origination Year	10,071	1,920
Three Years Prior of Origination Year	202	6,990
Four Years Prior of Origination Year	439	30,264
More than Five Years Prior of Origination Year	8,966	13,250
Revolving loans	15,303	31,362
Converted to term loans	18	11,218
Total	62,375	155,927
Substandard | Commercial
Credit risk profile by internally assigned grade for loans
Current Year	427	304
One Year Prior of Origination Year	184	7,785
Two Years Prior of Origination Year	3,737	2,043
Three Years Prior of Origination Year	1,777	4,017
Four Years Prior of Origination Year	4,457	7,542
More than Five Years Prior of Origination Year	2,961	3,113
Revolving loans	7,083	5,265
Converted to term loans	1,655	1,928
Total	22,281	31,997
Doubtful | Commercial
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	387
Converted to term loans	0	0
Total	0	387
Residential 1-4 family | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	791,758	567,282
One Year Prior of Origination Year	461,683	219,464
Two Years Prior of Origination Year	136,332	111,243
Three Years Prior of Origination Year	65,230	204,269
Four Years Prior of Origination Year	124,994	184,888
More than Five Years Prior of Origination Year	719,215	857,093
Revolving loans	0	0
Converted to term loans	0	0
Total	2,299,212	2,144,239
Residential 1-4 family | Real estate | Current
Credit risk profile by internally assigned grade for loans
Current Year	791,758	567,282
One Year Prior of Origination Year	461,683	218,988
Two Years Prior of Origination Year	133,345	111,243
Three Years Prior of Origination Year	64,421	203,916
Four Years Prior of Origination Year	124,994	184,888
More than Five Years Prior of Origination Year	712,452	849,788
Revolving loans	0	0
Converted to term loans	0	0
Total	2,288,653	2,136,105
Residential 1-4 family | Real estate | 30-59 days past due
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	809	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	2,210	2,629
Revolving loans	0	0
Converted to term loans	0	0
Total	3,019	2,629
Residential 1-4 family | Real estate | 60-89 days past due
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	476
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	1,468	2,314
Revolving loans	0	0
Converted to term loans	0	0
Total	1,468	2,790
Residential 1-4 family | Real estate | Greater than 90 days
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	2,987	0
Three Years Prior of Origination Year	0	353
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	3,085	2,362
Revolving loans	0	0
Converted to term loans	0	0
Total	6,072	2,715
Home equity  line of credit
Credit risk profile by internally assigned grade for loans
Conversion of debt	16,000
Home equity  line of credit | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	795,668	929,388
Converted to term loans	39,995	34,190
Total	835,663	963,578
Home equity  line of credit | Real estate | Current
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	794,518	927,106
Converted to term loans	39,116	33,228
Total	833,634	960,334
Home equity  line of credit | Real estate | 30-59 days past due
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	296	552
Converted to term loans	313	298
Total	609	850
Home equity  line of credit | Real estate | 60-89 days past due
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	16	267
Converted to term loans	70	75
Total	86	342
Home equity  line of credit | Real estate | Greater than 90 days
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	838	1,463
Converted to term loans	496	589
Total	1,334	2,052
Residential land | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	10,572	8,357
One Year Prior of Origination Year	6,794	3,427
Two Years Prior of Origination Year	1,116	1,598
Three Years Prior of Origination Year	532	939
Four Years Prior of Origination Year	267	22
More than Five Years Prior of Origination Year	578	1,274
Revolving loans	0	0
Converted to term loans	0	0
Total	19,859	15,617
Residential land | Real estate | Current
Credit risk profile by internally assigned grade for loans
Current Year	10,572	8,357
One Year Prior of Origination Year	6,794	3,427
Two Years Prior of Origination Year	1,116	1,598
Three Years Prior of Origination Year	532	939
Four Years Prior of Origination Year	267	22
More than Five Years Prior of Origination Year	181	272
Revolving loans	0	0
Converted to term loans	0	0
Total	19,462	14,615
Residential land | Real estate | 30-59 days past due
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	702
Revolving loans	0	0
Converted to term loans	0	0
Total	0	702
Residential land | Real estate | 60-89 days past due
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	0	0
Residential land | Real estate | Greater than 90 days
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	397	300
Revolving loans	0	0
Converted to term loans	0	0
Total	397	300
Residential construction | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	7,856	6,919
One Year Prior of Origination Year	3,019	3,093
Two Years Prior of Origination Year	0	385
Three Years Prior of Origination Year	0	625
Four Years Prior of Origination Year	263	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	11,138	11,022
Residential construction | Real estate | Current
Credit risk profile by internally assigned grade for loans
Current Year	7,856	6,919
One Year Prior of Origination Year	3,019	3,093
Two Years Prior of Origination Year	0	385
Three Years Prior of Origination Year	0	625
Four Years Prior of Origination Year	263	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	11,138	11,022
Residential construction | Real estate | 30-59 days past due
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	0	0
Residential construction | Real estate | 60-89 days past due
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	0	0
Residential construction | Real estate | Greater than 90 days
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	0	0
Commercial real estate | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	193,394	280,864
One Year Prior of Origination Year	279,455	114,426
Two Years Prior of Origination Year	106,188	124,301
Three Years Prior of Origination Year	89,219	64,087
Four Years Prior of Origination Year	56,174	127,799
More than Five Years Prior of Origination Year	320,950	261,388
Revolving loans	11,602	11,000
Converted to term loans	0	0
Total	1,056,982	983,865
Commercial real estate | Real estate | 30-59 days past due
Credit risk profile by internally assigned grade for loans
Total	0	0
Commercial real estate | Real estate | 60-89 days past due
Credit risk profile by internally assigned grade for loans
Total	0	488
Commercial real estate | Real estate | Greater than 90 days
Credit risk profile by internally assigned grade for loans
Total	0	0
Commercial real estate | Pass | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	173,794	270,603
One Year Prior of Origination Year	275,242	63,301
Two Years Prior of Origination Year	49,317	62,168
Three Years Prior of Origination Year	56,490	28,432
Four Years Prior of Origination Year	33,581	55,089
More than Five Years Prior of Origination Year	259,583	155,654
Revolving loans	11,602	11,000
Converted to term loans	0	0
Total	859,609	646,247
Commercial real estate | Special Mention | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	19,600	10,261
One Year Prior of Origination Year	3,529	36,405
Two Years Prior of Origination Year	42,935	57,952
Three Years Prior of Origination Year	30,870	33,763
Four Years Prior of Origination Year	20,788	68,287
More than Five Years Prior of Origination Year	32,824	48,094
Revolving loans	0	0
Converted to term loans	0	0
Total	150,546	254,762
Commercial real estate | Substandard | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	684	14,720
Two Years Prior of Origination Year	13,936	4,181
Three Years Prior of Origination Year	1,859	1,892
Four Years Prior of Origination Year	1,805	4,423
More than Five Years Prior of Origination Year	28,543	57,640
Revolving loans	0	0
Converted to term loans	0	0
Total	46,827	82,856
Commercial real estate | Doubtful | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	0	0
Commercial construction | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	17,140	16,390
One Year Prior of Origination Year	43,261	31,965
Two Years Prior of Origination Year	0	26,990
Three Years Prior of Origination Year	11,342	18,000
Four Years Prior of Origination Year	0	5,562
More than Five Years Prior of Origination Year	0	0
Revolving loans	19,337	22,517
Converted to term loans	0	0
Total	91,080	121,424
Commercial construction | Real estate | 30-59 days past due
Credit risk profile by internally assigned grade for loans
Total	0	0
Commercial construction | Real estate | 60-89 days past due
Credit risk profile by internally assigned grade for loans
Total	0	0
Commercial construction | Real estate | Greater than 90 days
Credit risk profile by internally assigned grade for loans
Total	0	0
Commercial construction | Pass | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	17,140	14,480
One Year Prior of Origination Year	43,261	31,965
Two Years Prior of Origination Year	0	26,990
Three Years Prior of Origination Year	11,342	0
Four Years Prior of Origination Year	0	5,562
More than Five Years Prior of Origination Year	0	0
Revolving loans	19,337	22,517
Converted to term loans	0	0
Total	91,080	101,514
Commercial construction | Special Mention | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	0	1,910
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	18,000
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	0	19,910
Commercial construction | Substandard | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	0	0
Commercial construction | Doubtful | Real estate
Credit risk profile by internally assigned grade for loans
Current Year	0	0
One Year Prior of Origination Year	0	0
Two Years Prior of Origination Year	0	0
Three Years Prior of Origination Year	0	0
Four Years Prior of Origination Year	0	0
More than Five Years Prior of Origination Year	0	0
Revolving loans	0	0
Converted to term loans	0	0
Total	$ 0	$ 0