Bank segment (HEI only) - Investment Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amortized Cost
Due in one year or less	$ 20,002
Due after one year through five years	117,549
Due after five years through ten years	76,750
Due after ten years	15,427
Amortized cost, available-for-sale securities with a single maturity date	229,728
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost	1,192,169
Total amortized cost	1,421,897	$ 1,421,622
Mortgage-related securities-FNMA, FHLMC and GNMA, amortized cost basis	141,875
Debt Securities, Held-to-maturity	141,875	44,515
Fair value
Due in one year or less	19,955
Due after one year through five years	116,508
Due after five years through ten years	75,227
Due after ten years	15,427
Available-for-sale securities with a single maturity date	227,117
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value	1,161,416
Total fair value	1,388,533	1,401,198
Mortgage-related securities - FNMA, FHLMC and GNMA, Fair Value	142,057
Held-to-maturity securities, Fair Value	142,057	44,412
Gains (losses) from sales of available-for-sale investments
Proceeds	0	0	$ 16,423
Interest income from taxable and non-taxable investment securities
Taxable	37,153	28,398	19,166
Non-taxable	609	425	18
Total	37,762	28,823	19,184
Available-for-sale securities pledged at carrying value	546,100	411,400
Available-for-sale securities, pledged at carrying value as collateral for securities sold under agreements to repurchase	92,000	165,100
Stock in Federal Home Loan Bank, at cost	9,958	9,706
FHLB Des Moines
Interest income from taxable and non-taxable investment securities
Stock in Federal Home Loan Bank, at cost	10,000	9,700
Mortgage-related securities - FNMA, FHLMC and GNMA
Gains (losses) from sales of available-for-sale investments
Proceeds	0	0	16,400
Gross gains	0	0	600
Gross losses	$ 0	$ 0	$ 0

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