Bank segment (HEI only) Available For Sale Investment Securities (Details) $ in Thousands	Dec. 31, 2015 USD ($) issue	Dec. 31, 2014 USD ($) issue
Available-for-sale securities
Total available-for-sale securities, amortized cost	$ 823,756	$ 549,627
Gross unrealized gains	4,589	6,745
Gross unrealized losses	(7,697)	(5,978)
Available-for-sale investment securities	$ 820,648	$ 550,394
Available-for-sale Securities, Continuous Unrealized Loss Position
Number of issues, less than 12 months | issue	51	12
Fair value, less than 12 months	$ 388,838	$ 88,999
Gross unrealized losses, less than 12 months	$ (3,732)	$ (525)
Number of issues, more than 12 months | issue	28	34
Fair value, 12 months or longer	$ 143,195	$ 201,791
Gross unrealized losses, 12 months or longer	(3,965)	(5,453)
U.S. Treasury and federal agency obligations
Available-for-sale securities
Total available-for-sale securities, amortized cost	213,234
Gross unrealized gains	1,025
Gross unrealized losses	(1,300)
Available-for-sale investment securities	$ 212,959
Available-for-sale Securities, Continuous Unrealized Loss Position
Number of issues, less than 12 months | issue	13
Fair value, less than 12 months	$ 83,053
Gross unrealized losses, less than 12 months	$ (866)
Number of issues, more than 12 months | issue	3
Fair value, 12 months or longer	$ 17,378
Gross unrealized losses, 12 months or longer	(434)
Mortgage-related securities-FNMA, FHLMC and GNMA
Available-for-sale securities
Total available-for-sale securities, amortized cost	610,522	430,120
Gross unrealized gains	3,564	5,653
Gross unrealized losses	(6,397)	(4,939)
Available-for-sale investment securities	$ 607,689	$ 430,834
Available-for-sale Securities, Continuous Unrealized Loss Position
Number of issues, less than 12 months | issue	38	6
Fair value, less than 12 months	$ 305,785	$ 47,029
Gross unrealized losses, less than 12 months	$ (2,866)	$ (164)
Number of issues, more than 12 months | issue	25	29
Fair value, 12 months or longer	$ 125,817	$ 172,623
Gross unrealized losses, 12 months or longer	$ (3,531)	(4,775)
U.S. Treasury and federal agency obligations
Available-for-sale securities
Total available-for-sale securities, amortized cost		119,507
Gross unrealized gains		1,092
Gross unrealized losses		(1,039)
Available-for-sale investment securities		$ 119,560
Available-for-sale Securities, Continuous Unrealized Loss Position
Number of issues, less than 12 months | issue		6
Fair value, less than 12 months		$ 41,970
Gross unrealized losses, less than 12 months		$ (361)
Number of issues, more than 12 months | issue		5
Fair value, 12 months or longer		$ 29,168
Gross unrealized losses, 12 months or longer		$ (678)