Bank of Hawaii Corporation Financial Statements - Schedule of Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements Captions [Line Items]
Investment Securities Gains (Losses), Net	$ (1,297)	$ 9,932	$ (3,986)
Noninterest Expense
Total Noninterest Expense	393,589	373,807	379,227
Income Before Income Tax Benefit and Equity in Undistributed Income of Subsidiaries	325,554	189,124	285,826
Income Tax Benefit (Expense)	72,182	35,320	59,913
Net Income	253,372	153,804	225,913
Comprehensive Income	179,168	192,738	245,844
Parent Company
Condensed Financial Statements Captions [Line Items]
Dividends from Bank of Hawaii	62,000	134,000	220,000
Investment Securities Gains (Losses), Net	(948)	13,336	(850)
Other Income and Interest on Investment	6	154	261
Total Income	61,058	147,490	219,411
Noninterest Expense
Intercompany Salaries and Services	764	758	768
Other Expenses	1,787	1,864	1,682
Total Noninterest Expense	2,551	2,622	2,450
Income Before Income Tax Benefit and Equity in Undistributed Income of Subsidiaries	58,507	144,868	216,961
Income Tax Benefit (Expense)	(2,131)	2,395	(1,818)
Equity in Undistributed Income of Subsidiaries	192,734	11,331	7,134
Net Income	253,372	153,804	225,913
Comprehensive Income	$ 179,168	$ 192,738	$ 245,844