Bank segment (HEI only) Available For Sale Investment Securities (Details) $ in Thousands	Dec. 31, 2014 USD ($) issue	Dec. 31, 2013 USD ($) issue
Available-for-sale securities
Total available-for-sale securities, amortized cost	$ 549,627	$ 535,090
Gross unrealized gains	6,745	6,911
Gross unrealized losses	(5,978)	(12,994)
Available-for-sale investment securities	$ 550,394	$ 529,007
Available-for-sale Securities, Continuous Unrealized Loss Position
Number of issues, less than 12 months | issue	12	49
Fair value, less than 12 months	$ 88,999	$ 313,820
Gross unrealized losses, less than 12 months	$ (525)	$ (11,353)
Number of issues, more than 12 months | issue	34	4
Fair value, 12 months or longer	$ 201,791	$ 19,655
Gross unrealized losses, 12 months or longer	(5,453)	(1,641)
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)
Mortgage-related securities-FNMA, FHLMC and GNMA
Available-for-sale securities
Total available-for-sale securities, amortized cost	430,120	374,993
Gross unrealized gains	5,653	4,911
Gross unrealized losses	(4,939)	(10,460)
Available-for-sale investment securities	$ 430,834	$ 369,444
Available-for-sale Securities, Continuous Unrealized Loss Position
Number of issues, less than 12 months | issue	6	36
Fair value, less than 12 months	$ 47,029	$ 228,543
Gross unrealized losses, less than 12 months	$ (164)	$ (8,819)
Number of issues, more than 12 months | issue	29	4
Fair value, 12 months or longer	$ 172,623	$ 19,655
Gross unrealized losses, 12 months or longer	$ (4,775)	(1,641)
U.S. Treasury and federal agency obligations
Available-for-sale securities
Total available-for-sale securities, amortized cost		83,193
Gross unrealized gains		174
Gross unrealized losses		(2,394)
Available-for-sale investment securities		$ 80,973
Available-for-sale Securities, Continuous Unrealized Loss Position
Number of issues, less than 12 months | issue		10
Fair value, less than 12 months		$ 70,799
Gross unrealized losses, less than 12 months		$ (2,394)
Number of issues, more than 12 months | issue		0
Fair value, 12 months or longer		$ 0
Gross unrealized losses, 12 months or longer		0
Municipal bonds
Available-for-sale securities
Total available-for-sale securities, amortized cost		76,904
Gross unrealized gains		1,826
Gross unrealized losses		(140)
Available-for-sale investment securities		$ 78,590
Available-for-sale Securities, Continuous Unrealized Loss Position
Number of issues, less than 12 months | issue		3
Fair value, less than 12 months		$ 14,478
Gross unrealized losses, less than 12 months		$ (140)
Number of issues, more than 12 months | issue		0
Fair value, 12 months or longer		$ 0
Gross unrealized losses, 12 months or longer		$ 0