Bank segment (HEI only) Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Amortized Cost
Due in one year or less	$ 0
Due after one year through five years	34,953
Due after five years through ten years	47,131
Due after ten years	37,423
Total amortized cost	119,507
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost	430,120
Total available-for-sale securities, amortized cost	549,627	$ 535,090
Fair value
Due in one year or less	0
Due after one year through five years	35,007
Due after five years through ten years	47,885
Due after ten years	36,668
Total fair value	119,560
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value	430,834
Estimated fair value	550,394	529,007
Gains (losses) from sales of available-for-sale investments
Proceeds	79,564	71,367	[1]	$ 3,548	[1]
Available-for-sale securities pledged at carrying value	88,600	87,100
Available-for-sale securities, pledged at carrying value as collateral for securities sold under agreements to repurchase	230,200	187,100
Interest income from taxable and non-taxable investment securities
Taxable	11,666	11,474		12,309
Non-taxable	279	1,621		1,513
Total	11,945	13,095		13,822
Mortgage-related securities - FNMA, FHLMC and GNMA
Gains (losses) from sales of available-for-sale investments
Proceeds	79,600	71,400		3,500
Gross gains	2,800	1,200		100
Gross losses	0	0		$ 0
U.S. Treasury and federal agency obligations
Amortized Cost
Total available-for-sale securities, amortized cost		83,193
Fair value
Estimated fair value		80,973
Municipal bonds
Amortized Cost
Total available-for-sale securities, amortized cost		76,904
Fair value
Estimated fair value		78,590
FHLB Seattle
Interest income from taxable and non-taxable investment securities
Cost method investments	$ 69,300	$ 92,500

[1] As restated - See Note 1, “Summary of significant accounting policies - Revision and restatements of previously issued financial statements.”