Bank of Hawaii Corporation Financial Statements - Schedule of Condensed Statements of Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Financial Statements Captions [Line Items]
Investment Securities Gains (Losses), Net	$ (6,111)	$ (1,297)	$ 9,932
Noninterest Expense
Total Noninterest Expense	415,265	393,589	373,807
Income Before Income Tax Benefit and Equity in Undistributed Income of Subsidiaries	290,634	325,554	189,124
Income Tax Benefit (Expense)	(64,830)	(72,182)	(35,320)
Net Income	225,804	253,372	153,804
Comprehensive Income (Loss)	(142,472)	179,168	192,738
Parent Company
Condensed Financial Statements Captions [Line Items]
Dividends from Bank of Hawai‘i	182,000	62,000	134,000
Investment Securities Gains (Losses), Net	(1,195)	(948)	13,336
Other Income and Interest on Investment	6	6	154
Total Income	180,811	61,058	147,490
Noninterest Expense
Intercompany Salaries and Services	1,121	764	758
Other Expenses	2,240	1,787	1,864
Total Noninterest Expense	3,361	2,551	2,622
Income Before Income Tax Benefit and Equity in Undistributed Income of Subsidiaries	177,450	58,507	144,868
Income Tax Benefit (Expense)	2,036	2,131	(2,395)
Equity in Undistributed Income of Subsidiaries	46,318	192,734	11,331
Net Income	225,804	253,372	153,804
Comprehensive Income (Loss)	$ (142,472)	$ 179,168	$ 192,738