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Bank segment (HEI only) - Off Balance Sheet Arrangements and Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
American Savings Bank (ASB) |  |  |  |
Guarantees |  |  |  |
Minimum reserve ratio | 1.36% |  |  |
FDIC insurance assessment |  | $ 3,200 | $ 2,300 | $ 1,200
Reserve for Off-balance Sheet Activities |  |  |  |
Guarantees |  |  |  |
Unused commitments to extend credit |  | 1,911,729 | 1,963,802 |
Home equity line of credit |  |  |  |
Guarantees |  |  |  |
Unused commitments to extend credit |  | 1,181,496 | 1,248,773 |
Commercial real estate |  |  |  |
Guarantees |  |  |  |
Unused commitments to extend credit |  | 612,158 | 574,281 |
Consumer |  |  |  |
Guarantees |  |  |  |
Unused commitments to extend credit |  | 62,090 | 69,168 |
Residential 1-4 family |  |  |  |
Guarantees |  |  |  |
Unused commitments to extend credit |  | 44,262 | 57,862 |
Commercial and financial standby letters of credit |  |  |  |
Guarantees |  |  |  |
Unused commitments to extend credit |  | $ 11,723 | $ 13,718 |

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