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Bank segment (HEI only) - Available For Sale Investment Securities (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) issue | Dec. 31, 2017 USD ($) issue
Available-for-sale |  |
Total amortized cost | $ 1,421,897 | $ 1,421,622
Gross unrealized gains | 954 | 1,231
Gross unrealized losses | (34,318) | (21,655)
Available-for-sale investment securities | $ 1,388,533 | $ 1,401,198
Number of issues, less than 12 months | issue | 33 | 82
Fair value, less than 12 months | $ 178,068 | $ 736,772
Gross unrealized losses, less than 12 months | $ (1,907) | $ (7,664)
Number of issues, more than 12 months | issue | 164 | 85
Fair value, 12 months or longer | $ 1,066,295 | $ 522,208
Gross unrealized losses, 12 months or longer | (32,411) | (13,991)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Debt Securities, Held-to-maturity | 141,875 | 44,515
Gross unrealized gains | 1,446 | 1
Gross unrealized losses | (1,264) | (104)
Held-to-maturity investment securities | $ 142,057 | $ 44,412
Number of issues, less than 12 months | issue | 3 | 2
Fair value, less than 12 months | $ 29,814 | $ 35,744
Gross unrealized losses, less than 12 months | $ (400) | $ (104)
Number of issues, more than 12 months | issue | 2 | 0
Fair value, 12 months or longer | $ 31,505 | $ 0
Gross unrealized losses, 12 months or longer | (864) | 0
U.S. Treasury and federal agency obligations |  |
Available-for-sale |  |
Total amortized cost | 156,694 | 185,891
Gross unrealized gains | 62 | 438
Gross unrealized losses | (2,407) | (2,031)
Available-for-sale investment securities | $ 154,349 | $ 184,298
Number of issues, less than 12 months | issue | 5 | 15
Fair value, less than 12 months | $ 25,882 | $ 83,137
Gross unrealized losses, less than 12 months | $ (208) | $ (825)
Number of issues, more than 12 months | issue | 19 | 8
Fair value, 12 months or longer | $ 118,405 | $ 62,296
Gross unrealized losses, 12 months or longer | (2,199) | (1,206)
Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies |  |
Available-for-sale |  |
Total amortized cost | 1,192,169 | 1,220,304
Gross unrealized gains | 789 | 793
Gross unrealized losses | (31,542) | (19,624)
Available-for-sale investment securities | $ 1,161,416 | $ 1,201,473
Number of issues, less than 12 months | issue | 22 | 67
Fair value, less than 12 months | $ 129,011 | $ 653,635
Gross unrealized losses, less than 12 months | $ (1,330) | $ (6,839)
Number of issues, more than 12 months | issue | 145 | 77
Fair value, 12 months or longer | $ 947,890 | $ 459,912
Gross unrealized losses, 12 months or longer | (30,212) | (12,785)
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Debt Securities, Held-to-maturity | 141,875 | 44,515
Gross unrealized gains | 1,446 | 1
Gross unrealized losses | (1,264) | (104)
Held-to-maturity investment securities | $ 142,057 | $ 44,412
Number of issues, less than 12 months | issue | 3 | 2
Fair value, less than 12 months | $ 29,814 | $ 35,744
Gross unrealized losses, less than 12 months | $ (400) | $ (104)
Number of issues, more than 12 months | issue | 2 | 0
Fair value, 12 months or longer | $ 31,505 | $ 0
Gross unrealized losses, 12 months or longer | (864) | 0
Corporate bonds |  |
Available-for-sale |  |
Total amortized cost | 49,398 |
Gross unrealized gains | 103 |
Gross unrealized losses | (369) |
Available-for-sale investment securities | $ 49,132 |
Number of issues, less than 12 months | issue | 6 |
Fair value, less than 12 months | $ 23,175 |
Gross unrealized losses, less than 12 months | $ (369) |
Number of issues, more than 12 months | issue | 0 |
Fair value, 12 months or longer | $ 0 |
Gross unrealized losses, 12 months or longer | 0 |
Mortgage revenue bonds |  |
Available-for-sale |  |
Total amortized cost | 23,636 | 15,427
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Available-for-sale investment securities | $ 23,636 | $ 15,427
Number of issues, less than 12 months | issue | 0 | 0
Fair value, less than 12 months | $ 0 | $ 0
Gross unrealized losses, less than 12 months | $ 0 | $ 0
Number of issues, more than 12 months | issue | 0 | 0
Fair value, 12 months or longer | $ 0 | $ 0
Gross unrealized losses, 12 months or longer | 0 | 0
American Savings Bank (ASB) |  |
Available-for-sale securities |  |
Payments to acquire new campus project | 76,500 |
Available-for-sale |  |
Available-for-sale investment securities | 1,388,533 | 1,401,198
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract] |  |
Debt Securities, Held-to-maturity | 141,875 | 44,515
Held-to-maturity investment securities | $ 142,057 | $ 44,412

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