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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Credit quality |  |  |  |
Total Revolving Loans Converted to Term Loans During the Period | $ 1,670 | $ 1,011 | $ 3,242 | $ 2,812
Commercial and Industrial |  |  |  |
Credit quality |  |  |  |
Total Revolving Loans Converted to Term Loans During the Period | 277 | 30 | 480 | 259
Home equity Line |  |  |  |
Credit quality |  |  |  |
Total Revolving Loans Converted to Term Loans During the Period | 1,057 | 538 | 2,072 | 1,617
Consumer |  |  |  |
Credit quality |  |  |  |
Total Revolving Loans Converted to Term Loans During the Period | $ 336 | $ 443 | $ 690 | $ 936

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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: |

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