Bank of Hawaii Corporation Financial Statements - Schedule of Condensed Statements of Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Financial Statements Captions [Line Items]
Investment Securities Losses, Net	$ (11,455)	$ (6,111)	$ (1,297)
Noninterest Expense
Total Noninterest Expense	437,518	415,265	393,589
Income Before Provision for Income Taxes	227,116	290,634	325,554
Income Tax Benefit (Expense)	(55,914)	(64,830)	(72,182)
Net Income	171,202	225,804	253,372
Comprehensive Income (Loss)	209,172	(142,472)	179,168
Parent Company
Condensed Financial Statements Captions [Line Items]
Dividends from Bank of Hawai‘i	137,000	182,000	62,000
Investment Securities Losses, Net	(1,394)	(1,195)	(948)
Other Income and Interest on Investment	6	6	6
Total Income	135,612	180,811	61,058
Noninterest Expense
Intercompany Salaries and Services	1,140	1,121	764
Other Expenses	2,409	2,240	1,787
Total Noninterest Expense	3,549	3,361	2,551
Income Before Provision for Income Taxes	132,063	177,450	58,507
Income Tax Benefit (Expense)	1,882	2,036	2,131
Equity in Undistributed Income of Subsidiaries	37,257	46,318	192,734
Net Income	171,202	225,804	253,372
Comprehensive Income (Loss)	$ 209,172	$ (142,472)	$ 179,168