Securities - Additional Information (Detail) $ in Millions	Sep. 30, 2018 USD ($) Securities	Dec. 31, 2017 USD ($)
Debt Securities, Available-for-sale [Line Items]
Number of securities with unrealized losses \| Securities	110
Securities pledged to municipalities for deposits in excess of FDIC limits, book value	$ 94.7	$ 119.8
Securities pledged to municipalities for deposits in excess of FDIC limits, market value	93.7	118.0
Overnight [Member]
Debt Securities, Available-for-sale [Line Items]
Securities with a fair market value sold under agreements	$ 42.0	$ 38.4

Number of securities with unrealized losses.

No definition available.

Name:	hfbc_NumberOfSecuritiesWithUnrealizedLosses
Namespace Prefix:	hfbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Pledged assets separately reported securities pledged for federal deposit insurance corporation at fair value.

+ References

No definition available.

+ Details

Name:	hfbc_PledgedAssetsSeparatelyReportedSecuritiesPledgedForFederalDepositInsuranceCorporationAtFairValue
Namespace Prefix:	hfbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Pledged financial instruments not separately reported securities for federal deposit insurance corporation.

+ References

No definition available.

+ Details

Name:	hfbc_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesForFederalDepositInsuranceCorporation
Namespace Prefix:	hfbc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611

+ Details

Name:	us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=us-gaap_MaturityOvernightMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: