Bank segment (HEI only) Statements of Income Data (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012
Interest expense
Interest on deposit liabilities									$ 5,077	$ 5,092		$ 6,423
Total interest expense									87,160	85,556		89,443
Provision for loan losses									6,126	1,507		12,883
Noninterest expense
Income before income taxes									261,922	247,747		217,407
Income taxes									91,712	84,341		76,859
Net income	$ 33,630	$ 48,286	$ 41,894	$ 46,400	$ 39,486	$ 48,707	$ 41,061	$ 34,152	170,210	163,406	[1]	140,548	[1]
American Savings Bank (ASB)
Interest and dividend income
Interest and fees on loans									179,341	172,969		176,057
Interest and dividends on investment securities									11,945	13,095		13,822
Total interest and dividend income									191,286	186,064		189,879
Interest expense
Interest on deposit liabilities									5,077	5,092		6,423
Interest on other borrowings									5,731	4,985		4,869
Total interest expense									10,808	10,077		11,292
Net interest income									180,478	175,987		178,587
Provision for loan losses									6,126	1,507		12,883
Net interest income after provision for loan losses									174,352	174,480		165,704
Noninterest income
Fees from other financial services									21,747	27,099		31,361
Fee income on deposit liabilities									19,249	18,363		17,775
Fee income on other financial products									8,131	8,405		6,577
Bank-owned life insurance									3,949	3,928		3,981
Mortgage banking income									2,913	8,309		14,628
Gain on sale of investment securities									2,847	1,226		134
Other income, net									2,375	4,753		1,204
Total noninterest income									61,211	72,083		75,660
Noninterest expense
Compensation and employee benefits									79,885	82,910		75,979
Occupancy									17,197	16,747		17,179
Data processing									11,690	10,952		10,098
Services									10,269	9,015		9,866
Equipment									6,564	7,295		7,105
Office supplies, printing and postage									6,089	4,233		3,870
Marketing									3,999	3,373		3,260
FDIC insurance									3,261	3,253		3,307
Other expense									20,990	21,726		21,679
Total noninterest expense									159,944	159,504		152,343
Income before income taxes									75,619	87,059		89,021
Income taxes									24,127	29,525		30,384
Net income									$ 51,492	$ 57,534		$ 58,637

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