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Transactions with Affiliates and Related Parties - Summary of Transactions (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Transactions with Affiliates and Related Parties |  |  |
Noninterest income from affiliates | $ 0 | $ 0 | $ 0
Noninterest expense to affiliates | 0 | 0 | $ 0
Other liabilities | 0 | 0 |
Off-balance sheet commitments with affiliates to purchase and sell foreign currencies | $ 0 | $ 0 |

X
- Definition Total aggregate amount of all noninterest expense incurred from transactions with related party. + References No definition available. + Details
Name: | fhb_NoninterestExpenseRelatedParty
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of noninterest income earned from transactions with related party. + References No definition available. + Details
Name: | fhb_NoninterestIncomeRelatedParty
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents off-balance sheet commitments with affiliates to purchase and sell foreign currencies. + References No definition available. + Details
Name: | fhb_OffBalanceSheetCommitmentsToPurchaseAndSellForeignCurrenciesRelatedParties
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition For an unclassified balance sheet, amount of other liabilities arising from transactions with related parties. + References No definition available. + Details
Name: | fhb_OtherLiabilitiesRelatedParties
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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