Bank segment (HEI only) Deposit Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Weighted-average stated rate
Savings (as a percent)	0.07%	0.06%
Other checking, interest bearing (as a percent)	0.02%	0.02%
Money market (as a percent)	0.13%	0.12%
Term certificates (as a percent)	0.93%	0.83%
Total weighted-average stated rate (as a percent)	0.12%	0.11%
Deposit liabilities
Savings	$ 2,030,644	$ 1,923,062
Other checking
Interest-bearing	831,143	768,787
Noninterest-bearing	746,875	665,005
Commercial checking	773,499	677,789
Money market	167,641	158,010
Term certificates	475,452	430,762
Total Amount	5,025,254	4,623,415
Certificate accounts of $100,000 or more	163,200	119,900
Term certificates outstanding, scheduled maturities
2016	197,095
2017	72,817
2018	63,876
2019	53,525
2020	84,749
Thereafter	3,390
Total	475,452
Interest expense on deposit liabilities by type of deposit
Term certificates	3,747	3,603	$ 3,702
Savings	1,257	1,134	1,052
Money market	205	214	232
Interest-bearing checking	139	126	106
Interest expense on deposit liabilities	$ 5,348	$ 5,077	$ 5,092