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Bank segment (HEI only) - Reconciliation of Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 761,650 | $ 768,048 | $ 685,277 | $ 645,874 | $ 658,597 | $ 673,185 | $ 632,281 | $ 591,562 | $ 2,860,849 | $ 2,555,625 | $ 2,380,654
Total interest expense |  |  |  |  |  |  |  |  | 104,216 | 91,128 | 88,558
Less: Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  | (5,962) | (7,942) | (7,663)
Total expenses |  |  |  |  |  |  |  |  | 2,527,493 | 2,209,392 | 2,024,816
Operating income | $ 84,604 | $ 98,064 | $ 78,799 | $ 71,889 | $ 87,220 | $ 111,473 | $ 77,802 | $ 69,738 | 333,356 | 346,233 | 355,838
Add back: Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  | 5,962 | 7,942 | 7,663
Income before income taxes |  |  |  |  |  |  |  |  | 254,461 | 276,580 | 373,841
American Savings Bank (ASB) |  |  |  |  |  |  |  |  |  |  |
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest and dividend income |  |  |  |  |  |  |  |  | 258,225 | 236,078 | 218,958
Noninterest income |  |  |  |  |  |  |  |  | 56,050 | 61,562 | 66,966
Revenues |  |  |  |  |  |  |  |  | 314,275 | 297,640 | 285,924
Total interest expense |  |  |  |  |  |  |  |  | 15,539 | 12,156 | 12,755
Provision for loan losses |  |  |  |  |  |  |  |  | 14,745 | 10,901 | 16,763
Noninterest expense |  |  |  |  |  |  |  |  | 177,413 | 175,867 | 169,054
Less: Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  | (1,657) | (820) | (875)
Total expenses |  |  |  |  |  |  |  |  | 206,040 | 198,104 | 197,697
Operating income |  |  |  |  |  |  |  |  | 108,235 | 99,536 | 88,227
Add back: Retirement defined benefits expense—other than service costs |  |  |  |  |  |  |  |  | 1,657 | 820 | 875
Income before income taxes |  |  |  |  |  |  |  |  | $ 106,578 | $ 98,716 | $ 87,352

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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