Organization and Basis of Presentation (Details)	12 Months Ended
	Dec. 31, 2023 location
Capitalization
Loan modification, period of nonaccrual status	6 months
First Hawaiian, Inc. (FHI)
Capitalization
Outstanding common stock owned (as a percent)	100.00%
First Hawaiian Bank (FHB)
Capitalization
Number of Branches	50