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Bank segment (HEI only) - Investment Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amortized Cost |  |  |
Due in one year or less | $ 5,000 |  |
Due after one year through five years | 87,404 |  |
Due after five years through ten years | 80,161 |  |
Due after ten years | 28,753 |  |
Total amortized cost | 201,318 |  |
Mortgage-related securities-FNMA, FHLMC and GNMA - amortized cost | 1,220,304 |  |
Total available-for-sale securities, amortized cost | 1,421,622 | $ 1,118,350 |
Mortgage-related securities-FNMA, FHLMC and GNMA, amortized cost basis | 44,515 |  |
Held-to-maturity Securities | 44,515 | 0 |
Fair value |  |  |
Due in one year or less | 4,992 |  |
Due after one year through five years | 87,020 |  |
Due after five years through ten years | 79,358 |  |
Due after ten years | 28,355 |  |
Total fair value | 199,725 |  |
Mortgage-related securities-FNMA, FHLMC and GNMA - fair value | 1,201,473 |  |
Estimated fair value | 1,401,198 | 1,105,182 |
Mortgage-related securities - FNMA, FHLMC and GNMA, Fair Value | 44,412 |  |
Held-to-maturity securities, Fair Value | 44,412 |  |
Gains (losses) from sales of available-for-sale investments |  |  |
Proceeds | 0 | 16,423 | $ 0
Interest income from taxable and non-taxable investment securities |  |  |
Taxable | 28,398 | 19,166 | 15,120
Non-taxable | 425 | 18 | 0
Total | 28,823 | 19,184 | 15,120
Available-for-sale securities pledged at carrying value | 411,400 | 277,100 |
Available-for-sale securities, pledged at carrying value as collateral for securities sold under agreements to repurchase | 165,100 | 114,900 |
FHLB Des Moines |  |  |
Interest income from taxable and non-taxable investment securities |  |  |
Cost method investments | 9,700 | 11,200 |
Mortgage-related securities - FNMA, FHLMC and GNMA |  |  |
Gains (losses) from sales of available-for-sale investments |  |  |
Proceeds | 0 | 16,400 | 0
Gross gains | 0 | 600 | 0
Gross losses | $ 0 | $ 0 | $ 0

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