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Bank of Hawaii Corporation Financial Statements - Schedule of Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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