XML 91 R80.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Income Taxes - Examinations (Details) | 6 Months Ended
--- | ---
Jun. 30, 2018 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