Summary of Significant Accounting Policies (Policies)	6 Months Ended
Jun. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Bank of Hawaii Corporation (the “Parent”) is a Delaware corporation and a bank holding company headquartered in Honolulu, Hawaii. Bank of Hawai‘i Corporation is a trade name of Bank of Hawaii Corporation, and along with its subsidiaries (collectively, the “Company”), provides a broad range of financial products and services to businesses, consumers and governments in Hawaii and the West Pacific. The majority of the Company’s operations consist of customary commercial and consumer banking services including, but not limited to, lending, leasing, deposit services, trust and investment activities, brokerage services, and trade financing. The accompanying consolidated financial statements include the accounts of the Parent and its subsidiaries. The Parent’s principal operating subsidiary is Bank of Hawaii (the “Bank”), doing business as Bank of Hawai‘i. The consolidated financial statements in this report have not been audited by an independent registered public accounting firm, but, in the opinion of management, reflect all adjustments necessary for a fair presentation of the results for the interim periods. All such adjustments are of a normal recurring nature. Intercompany accounts and transactions have been eliminated in consolidation. Certain prior period information has been reclassified to conform to the current period presentation. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the full fiscal year or any future period. The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and accompanying notes required by GAAP for complete financial statements and should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Significant changes to accounting policies from those disclosed in our audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K are presented below.
Recently Issued Disclosure Rules	Recently Issued Disclosure Rules In March 2024, the U.S. Securities and Exchange Commission ("SEC") adopted the final rule under SEC Release No. 33-11275, “The Enhancement and Standardization of Climate-Related Disclosures for Investors”. This rule will require registrants to disclose certain climate-related information in registration statements and annual reports. Subsequent to adoption, a number of businesses and business groups filed petitions seeking a judicial review of the final rule, asserting that the SEC does not have the authority to promulgate it. In April 2024, the SEC issued an order staying its final rule pending completion of the judicial review of certain petitions consolidated in the U.S. Court of Appeals for the Eighth Circuit. The Company will continue to monitor the outcome of this judicial review.
Preferred Stock Issuance	Preferred Stock Issuance On June 21, 2024, the Company issued and sold 6,600,000 depositary shares (the “depositary shares”), each representing a 1/40th ownership interest in a share of 8.000% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series B, par value $0.01 per share (the “Series B Preferred Stock”). The Series B Preferred Stock has a liquidation preference of $1,000 per share. Net proceeds, after underwriting discounts and expenses, totaled $160.6 million. Dividends on the Series B Preferred Stock are not cumulative and will be paid when declared by the Parent’s Board of Directors to the extent that we have legally available funds to pay dividends. If declared, dividends will accrue and be payable quarterly, in arrears, on the liquidation preference amount, on a non-cumulative basis, at a rate of 8.000% per annum. Holders of the Series B Preferred Stock will not have voting rights, except with respect to certain changes in the terms of the preferred stock, certain dividend non-payments and as otherwise required by applicable law. The Company may redeem the Series B Preferred Stock at its option, (i) in whole or in part, from time to time, on any dividend payment date on or after August 1, 2029 or (ii) in whole but not in part, at any time within 90 days following a regulatory capital treatment event, in either case at a redemption price equal to $1,000 per share (equivalent to $25 per depositary share), plus any declared and unpaid dividends.

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2024

Bank of Hawaii Corporation (the “Parent”) is a Delaware corporation and a bank holding company headquartered in Honolulu, Hawaii. Bank of Hawai‘i Corporation is a trade name of Bank of Hawaii Corporation, and along with its subsidiaries (collectively, the “Company”), provides a broad range of financial products and services to businesses, consumers and governments in Hawaii and the West Pacific. The majority of the Company’s operations consist of customary commercial and consumer banking services including, but not limited to, lending, leasing, deposit services, trust and investment activities, brokerage services, and trade financing. The accompanying consolidated financial statements include the accounts of the Parent and its subsidiaries. The Parent’s principal operating subsidiary is Bank of Hawaii (the “Bank”), doing business as Bank of Hawai‘i.

The consolidated financial statements in this report have not been audited by an independent registered public accounting firm, but, in the opinion of management, reflect all adjustments necessary for a fair presentation of the results for the interim periods. All such adjustments are of a normal recurring nature. Intercompany accounts and transactions have been eliminated in consolidation. Certain prior period information has been reclassified to conform to the current period presentation. Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for the full fiscal year or any future period.

The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and accompanying notes required by GAAP for complete financial statements and should be read in conjunction with the audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2023. Significant changes to accounting policies from those disclosed in our audited consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K are presented below.

Recently Issued Disclosure Rules

In March 2024, the U.S. Securities and Exchange Commission ("SEC") adopted the final rule under SEC Release No. 33-11275, “The Enhancement and Standardization of Climate-Related Disclosures for Investors”. This rule will require registrants to disclose certain climate-related information in registration statements and annual reports. Subsequent to adoption, a number of businesses and business groups filed petitions seeking a judicial review of the final rule, asserting that the SEC does not have the authority to promulgate it. In April 2024, the SEC issued an order staying its final rule pending completion of the judicial review of certain petitions consolidated in the U.S. Court of Appeals for the Eighth Circuit. The Company will continue to monitor the outcome of this judicial review.

Preferred Stock Issuance

On June 21, 2024, the Company issued and sold 6,600,000 depositary shares (the “depositary shares”), each representing a 1/40th ownership interest in a share of 8.000% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series B, par value $0.01 per share (the “Series B Preferred Stock”). The Series B Preferred Stock has a liquidation preference of $1,000 per share. Net proceeds, after underwriting discounts and expenses, totaled $160.6 million. Dividends on the Series B Preferred Stock are not cumulative and will be paid when declared by the Parent’s Board of Directors to the extent that we have legally available funds to pay dividends. If declared, dividends will accrue and be payable quarterly, in arrears, on the liquidation preference amount, on a non-cumulative basis, at a rate of 8.000% per annum. Holders of the Series B Preferred Stock will not have voting rights, except with respect to certain changes in the terms of the preferred stock, certain dividend non-payments and as otherwise required by applicable law. The Company may redeem the Series B Preferred Stock at its option, (i) in whole or in part, from time to time, on any dividend payment date on or after August 1, 2029 or (ii) in whole but not in part, at any time within 90 days following a regulatory capital treatment event, in either case at a redemption price equal to $1,000 per share (equivalent to $25 per depositary share), plus any declared and unpaid dividends.