Bank segment (HEI only) - FHLB Advances (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Weighted-average stated rate
2017 (as a percent)	4.28%
2018 (as a percent)	1.95%
2019 (as a percent)	0.00%
2020 (as a percent)	0.00%
2021 (as a percent)	0.00%
Thereafter (as a percent)	0.00%
Total weighted-average stated rate (as a percent)	3.12%
Due in
2017	$ 50,000
2018	50,000
2019	0
2020	0
2021	0
Thereafter	0
Total amount due	$ 100,000