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Bank segment (HEI only) - Credit Risk Profile Based on Payment Activity for Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Credit risk profile based on payment activity for loans
Total past due	$ 19,635	$ 19,751
Current	5,325,591	5,100,913
Total	5,345,226	5,120,664	$ 4,843,634
Recorded Investment greater than 90 days and accruing	0	0
Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	8,134	4,686
Current	2,136,105	2,173,449
Total	2,144,239	2,178,135
Recorded Investment greater than 90 days and accruing	0	0
Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	488	0
Current	983,377	824,830
Total	983,865	824,830
Recorded Investment greater than 90 days and accruing	0	0
Home equity line of credit
Credit risk profile based on payment activity for loans
Total past due	3,244	2,930
Current	960,334	1,089,195
Total	963,578	1,092,125
Recorded Investment greater than 90 days and accruing	0	0
Residential land
Credit risk profile based on payment activity for loans
Total past due	1,002	25
Current	14,615	14,679
Total	15,617	14,704
Recorded Investment greater than 90 days and accruing	0	0
Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Current	121,424	70,605
Total	121,424	70,605
Recorded Investment greater than 90 days and accruing	0	0
Residential construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Current	11,022	11,670
Total	11,022	11,670
Recorded Investment greater than 90 days and accruing	0	0
Commercial
Credit risk profile based on payment activity for loans
Total past due	1,040	1,560
Current	935,708	669,114
Total	936,748	670,674
Recorded Investment greater than 90 days and accruing	0	0
Consumer
Credit risk profile based on payment activity for loans
Total past due	5,727	10,550
Current	163,006	247,371
Total	168,733	257,921
Recorded Investment greater than 90 days and accruing	0	0
30-59 days past due
Credit risk profile based on payment activity for loans
Total past due	7,394	8,864
30-59 days past due | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	2,629	2,588
30-59 days past due | Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	0	0
30-59 days past due | Home equity line of credit
Credit risk profile based on payment activity for loans
Total past due	850	813
30-59 days past due | Residential land
Credit risk profile based on payment activity for loans
Total past due	702	0
30-59 days past due | Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
30-59 days past due | Residential construction
Credit risk profile based on payment activity for loans
Total past due	0	0
30-59 days past due | Commercial
Credit risk profile based on payment activity for loans
Total past due	608	1,077
30-59 days past due | Consumer
Credit risk profile based on payment activity for loans
Total past due	2,605	4,386
60-89 days past due
Credit risk profile based on payment activity for loans
Total past due	5,411	3,858
60-89 days past due | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	2,790	290
60-89 days past due | Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	488	0
60-89 days past due | Home equity line of credit
Credit risk profile based on payment activity for loans
Total past due	342	0
60-89 days past due | Residential land
Credit risk profile based on payment activity for loans
Total past due	0	0
60-89 days past due | Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
60-89 days past due | Residential construction
Credit risk profile based on payment activity for loans
Total past due	0	0
60-89 days past due | Commercial
Credit risk profile based on payment activity for loans
Total past due	300	311
60-89 days past due | Consumer
Credit risk profile based on payment activity for loans
Total past due	1,491	3,257
Greater than 90 days
Credit risk profile based on payment activity for loans
Total past due	6,830	7,029
Greater than 90 days | Residential 1-4 family
Credit risk profile based on payment activity for loans
Total past due	2,715	1,808
Greater than 90 days | Commercial real estate
Credit risk profile based on payment activity for loans
Total past due	0	0
Greater than 90 days | Home equity line of credit
Credit risk profile based on payment activity for loans
Total past due	2,052	2,117
Greater than 90 days | Residential land
Credit risk profile based on payment activity for loans
Total past due	300	25
Greater than 90 days | Commercial construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Greater than 90 days | Residential construction
Credit risk profile based on payment activity for loans
Total past due	0	0
Greater than 90 days | Commercial
Credit risk profile based on payment activity for loans
Total past due	132	172
Greater than 90 days | Consumer
Credit risk profile based on payment activity for loans
Total past due	$ 1,631	$ 2,907

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