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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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