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Derivative Financial Instruments - Amounts Recorded in Balance Sheets Related to Cumulative Basis Adjustments (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Derivative Financial Instruments |  |
Carrying Amount of the Hedged Asset | $ 56,725 | $ 56,592
Hedged Asset, Fair Value Hedge, Cumulative Increase (Decrease) | $ (7,963) | $ (10,908)

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- Definition Amount of carrying value as of balance sheet date of asset hedged. + References No definition available. + Details
Name: | fhb_HedgedAssetCarryingAmount
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 181 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480401/815-10-55-181 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4EE -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4EE + Details
Name: | us-gaap_HedgedAssetFairValueHedgeCumulativeIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant