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Bank segment (HEI only) - Off Balance Sheet Arrangements and Additional Information (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Minimum |  |  |
Guarantees |  |  |
Prepaid assessment rate for financial institutions in low risk category | 0.025% |  |
Prepaid assessment rate for financial institutions in high risk category | 0.30% |  |
Maximum |  |  |
Guarantees |  |  |
Prepaid assessment rate for financial institutions in low risk category | 0.09% |  |
Prepaid assessment rate for financial institutions in high risk category | 0.45% |  |
American Savings Bank (ASB) |  |  |
Guarantees |  |  |
FDIC insurance assessment | $ 2,500 | $ 2,600 | $ 3,200
American Savings Bank (ASB) | Indemnification Agreement |  |  |
Guarantees |  |  |
Accrued indemnification litigation obligation | 1,100 |  |
Reserve for Off-balance Sheet Activities |  |  |
Guarantees |  |  |
Unused Commitments to Extend Credit | 1,859,046 | 1,780,437 |
Home equity line of credit |  |  |
Guarantees |  |  |
Unused Commitments to Extend Credit | 1,242,804 | 1,214,103 |
Commercial and commercial real estate |  |  |
Guarantees |  |  |
Unused Commitments to Extend Credit | 515,058 | 466,510 |
Consumer |  |  |
Guarantees |  |  |
Unused Commitments to Extend Credit | 70,292 | 68,053 |
Residential 1-4 family |  |  |
Guarantees |  |  |
Unused Commitments to Extend Credit | 17,552 | 18,635 |
Commercial and financial standby letters of credit |  |  |
Guarantees |  |  |
Unused Commitments to Extend Credit | $ 13,340 | $ 13,136 |

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