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Allowance for Credit Losses - Amortized Cost Basis of Revolving Loans that Were Converted to Term Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Credit quality |  |  |  |
Total Revolving Loans Converted to Term Loans During the Period | $ 314 | $ 1,177 | $ 3,556 | $ 3,989
Commercial and Industrial |  |  |  |
Credit quality |  |  |  |
Total Revolving Loans Converted to Term Loans During the Period |  | 195 | 480 | 454
Home equity Line |  |  |  |
Credit quality |  |  |  |
Total Revolving Loans Converted to Term Loans During the Period |  | 560 | 2,072 | 2,177
Consumer |  |  |  |
Credit quality |  |  |  |
Total Revolving Loans Converted to Term Loans During the Period | $ 314 | $ 422 | $ 1,004 | $ 1,358

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- Definition The amount of financing receivable converted to term loans for the period, amortized cost basis during the period. + References No definition available. + Details
Name: | fhb_FinancingReceivableRevolvingLoansConvertedToTermLoansForPeriodAmortizedCostBasisIncreaseDecrease
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=fhb_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=fhb_HomeEquityLinePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |