Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Nov. 09, 2016
Document and Entity Information
Entity Registrant Name	FIRST HAWAIIAN, INC.
Entity Central Index Key	0000036377
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		139,530,654
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3