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Income Taxes - Examinations (Details) | 9 Months Ended
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Sep. 30, 2017 item
Income Taxes |
Number of examinations under way | 0

X
- Definition The number of income tax examinations that an enterprise is currently subject to or that have not been completed. + References No definition available. + Details
Name: | fhb_IncomeTaxExaminationNumberOfExaminationsInProgress
Namespace Prefix: | fhb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration