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Reportable Operating Segments - Business Segments (Details)	6 Months Ended
	Jun. 30, 2019 segment location
Reportable operating segments
Number of business segments | segment	3
Retail Banking
Reportable operating segments
Number of Branches | location	59

X

- Definition

Represents the number of branches that offers a comprehensive suite of banking services to consumer and commercial customers including loans, deposit products, wealth management, insurance, trust, retirement planning, credit card and merchant processing services.

+ References

No definition available.

+ Details

Name:	fhb_NumberOfBranches
Namespace Prefix:	fhb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=fhb_RetailBankingBusinessSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: