Bank of Hawaii Corporation Financial Statements - Schedule of Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Activities
Net Income	$ 225,804	$ 253,372	$ 153,804
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Share-Based Compensation	16,066	13,267	7,578
Net (Gains) Losses on Investment Securities	6,111	1,297	(9,932)
Net Change in Other Assets and Other Liabilities	13,608	27,989	(127,934)
Net Cash Provided by Operating Activities	332,960	377,151	146,416
Investing Activities
Purchases	(91,229)	(2,676,376)	(1,661,180)
Net Cash Used in Investing Activities	(1,253,418)	(2,423,334)	(2,373,282)
Financing Activities
Proceeds from Issuance of Common Stock	6,797	13,611	9,389
Proceeds from Issuance of Preferred Stock		175,487
Repurchase of Common Stock	(55,063)	(31,258)	(18,006)
Cash Dividends Paid on Common Stock	(112,557)	(110,633)	(107,434)
Cash Dividends Paid on Preferred Stock	(7,877)	(2,975)
Net Cash Provided by Financing Activities	761,791	1,992,529	2,282,296
Net Change in Cash and Cash Equivalents	(158,667)	(53,654)	55,430
Cash and Cash Equivalents at Beginning of Period	560,434	614,088	558,658
Cash and Cash Equivalents at End of Period	401,767	560,434	614,088
Parent Company
Operating Activities
Net Income	225,804	253,372	153,804
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Share-Based Compensation	847	779	795
Net (Gains) Losses on Investment Securities	1,195	948	(13,336)
Equity in Undistributed Income of Subsidiaries	(46,318)	(192,734)	(11,331)
Net Change in Other Assets and Other Liabilities	1,138	(977)	(68)
Net Cash Provided by Operating Activities	182,666	61,388	129,864
Investing Activities
Capital Contributions to the Bank of Hawai‘i		(165,000)
Proceeds from (Expenses related to) Sales of Investment Securities	(1,195)	(948)	18,336
Purchases			(2,501)
Net Cash Used in Investing Activities	(1,195)	(165,948)	15,835
Financing Activities
Proceeds from Issuance of Common Stock	6,797	13,611	9,389
Proceeds from Issuance of Preferred Stock		175,487
Repurchase of Common Stock	(55,063)	(31,258)	(18,006)
Cash Dividends Paid on Common Stock	(112,557)	(110,633)	(107,434)
Cash Dividends Paid on Preferred Stock	(7,877)	(2,975)
Net Cash Provided by Financing Activities	(168,700)	44,232	(116,051)
Net Change in Cash and Cash Equivalents	12,771	(60,328)	29,648
Cash and Cash Equivalents at Beginning of Period	6,376	66,704	37,056
Cash and Cash Equivalents at End of Period	$ 19,147	$ 6,376	$ 66,704