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Investment Securities - Proceeds from Calls and Sales, Realized Gains and Losses and Interest Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Proceeds from calls and sales of investment securities |  |  |  |
Proceeds from calls of investment securities | $ 0.0 | $ 46.2 | $ 0.0 | $ 121.2
Proceeds from sales of investment securities | 0.0 | 0.0 | 0.0 | 505.0
Realized investment gains and losses |  |  |  |
Gross realized gains on sales of investments | 0.0 | 0.0 | 0.0 | 25.8
Gross realized losses on sales of investments | 0.0 | 0.0 | 0.0 | 0.0
Provision for income taxes related to net realized gains on sale of investment securities | 0.0 | 0.0 | 0.0 | 10.2
Interest income from taxable and nontaxable investment securities |  |  |  |
Taxable interest income | 24.2 | 21.1 | 75.7 | 57.1
Nontaxable interest income | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0

X
- Definition This item represents the amount of tax expense (benefit) of net total realized gain (loss) included in earnings for the period as a result of selling marketable securities and any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References No definition available. + Details
Name: | fhb_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairmentsTax
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with calls on investment securities. + References No definition available. + Details
Name: | fhb_ProceedsFromCallsOnInvestmentSecurities
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of investment securities. + References No definition available. + Details
Name: | fhb_ProceedsFromSaleOfInvestmentSecurities
Namespace Prefix: | fhb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
Name: | us-gaap_GainOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities exempt from state, federal and other income tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition Amount of operating interest income, including amortization and accretion of premiums and discounts, on securities subject to state, federal and other income tax. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The difference between the carrying value and the sale price of an investment. A loss would be recognized when the sale price of the investment is less than the carrying value of the investment. This element refers to the Loss included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
Name: | us-gaap_LossOnSaleOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- References No definition available. + Details
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