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Bank segment (HEI only) - Investment Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Available-for-sale |  |  |
Due in one year or less | $ 15,055 |  |
Due after one year through five years | 62,461 |  |
Due after five years through ten years | 58,250 |  |
Due after ten years | 0 |  |
Total | 135,766 |  |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 2,482,618 |  |
Total available-for-sale securities | 2,618,384 |  |
Held-to-maturity |  |  |
Due in one year or less | 0 |  |
Due after one year through five years | 0 |  |
Due after five years through ten years | 59,871 |  |
Due after ten years | 0 |  |
Total | 59,871 |  |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 462,399 |  |
Amortized cost | 522,270 |  |
Available-for-sale |  |  |
Due in one year or less | 15,298 |  |
Due after one year through five years | 63,256 |  |
Due after five years through ten years | 58,141 |  |
Due after ten years | 0 |  |
Total | 136,695 |  |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 2,437,923 |  |
Total available-for-sale securities | 2,574,618 | $ 1,970,417 |
Held-to-maturity |  |  |
Due in one year or less | 0 |  |
Due after one year through five years | 0 |  |
Due after five years through ten years | 59,869 |  |
Due after ten years | 0 |  |
Total | 59,869 |  |
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | 450,605 |  |
Total held-to-maturity securities | 510,474 |  |
Gains (losses) from sales of available-for-sale investments |  |  |
Proceeds | 197,354 | 169,157 | $ 19,810
Gross gains | 975 | 9,275 | 653
Gross losses | (447) | 0 | 0
Interest income from taxable and non-taxable investment securities |  |  |
Taxable | 42,534 | 29,760 | 31,848
Non-taxable | 930 | 769 | 1,074
Total | 43,464 | 30,529 | $ 32,922
Available-for-sale securities pledged at carrying value | 416,000 | 353,000 |
Available-for-sale securities, pledged at carrying value as collateral for securities sold under agreements to repurchase | 161,000 | 92,000 |
Stock in federal home loan bank at cost | 10,000 | 8,680 |
FHLB Des Moines |  |  |
Interest income from taxable and non-taxable investment securities |  |  |
Stock in federal home loan bank at cost | $ 10,000 | $ 8,700 |

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