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Regulatory Capital Requirements - Capital Conservation Buffer (Details) | Jun. 30, 2018 | Jan. 01, 2016
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Regulatory Capital Requirements |  |
Initial capital conservation buffer (as a percent) |  | 0.625%
Capital conservation buffer annual increase after initial year (as a percent) | 0.625% |
Capital conservation buffer final level (as a percent) | 2.50% |

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- Definition Capital conservation buffer annual increase as a percentage of risk weighted assets after year one as defined by regulations. + References No definition available. + Details
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Namespace Prefix: | fhb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The maximum capital conservation buffer as a percentage of risk weighted assets as defined by regulations. + References No definition available. + Details
Name: | fhb_CapitalConservationBufferPercentageOfRiskWeightedAssetsMaximum
Namespace Prefix: | fhb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Capital conservation buffer as a percentage of risk weighted assets in year one as defined by regulations. + References No definition available. + Details
Name: | fhb_CapitalConservationBufferPercentageOfRiskWeightedAssetsYearOne
Namespace Prefix: | fhb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RegulatoryCapitalRequirementsAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration