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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating Activities |  |  |
Net Income | $ 253,372 | $ 153,804 | $ 225,913
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: |  |  |
Share-Based Compensation | 13,267 | 7,578 | 8,337
Net (Gains) Losses on Investment Securities | 1,297 | (9,932) | 3,986
Net Change in Other Assets and Other Liabilities | 27,989 | (127,934) | (20,039)
Net Cash Provided by Operating Activities | 377,151 | 146,416 | 234,238
Investing Activities |  |  |
Purchases | (2,676,376) | (1,661,180) | (1,380,430)
Net Cash Used in Investing Activities | (2,423,334) | (2,373,282) | (773,268)
Financing Activities |  |  |
Proceeds from Issuance of Common Stock | 13,611 | 9,389 | 7,872
Proceeds from Issuance of Preferred Stock | 175,487 |  |
Repurchase of Common Stock | (31,258) | (18,006) | (137,649)
Cash Dividends Paid on Common Stock | (110,633) | (107,434) | (105,478)
Cash Dividends Paid on Preferred Stock | (2,975) |  |
Net Cash Provided by Financing Activities | 1,992,529 | 2,282,296 | 571,719
Net Change in Cash and Cash Equivalents | (53,654) | 55,430 | 32,689
Cash and Cash Equivalents at Beginning of Period | 614,088 | 558,658 | 525,969
Cash and Cash Equivalents at End of Period | 560,434 | 614,088 | 558,658
Parent Company |  |  |
Operating Activities |  |  |
Net Income | 253,372 | 153,804 | 225,913
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: |  |  |
Share-Based Compensation | 779 | 795 | 760
Net (Gains) Losses on Investment Securities | 948 | (13,336) | 850
Equity in Undistributed Income of Subsidiaries | (192,734) | (11,331) | (7,134)
Net Change in Other Assets and Other Liabilities | (977) | (68) | (135)
Net Cash Provided by Operating Activities | 61,388 | 129,864 | 220,254
Investing Activities |  |  |
Capital Contributions to the Bank | (165,000) |  |
Proceeds from (Expenses related to) Sales of Investment Securities | (948) | 18,336 | 4,259
Purchases |  | (2,501) | (4,933)
Net Cash Used in Investing Activities | (165,948) | 15,835 | (674)
Financing Activities |  |  |
Proceeds from Issuance of Common Stock | 13,611 | 9,389 | 7,872
Proceeds from Issuance of Preferred Stock | 175,487 |  |
Repurchase of Common Stock | (31,258) | (18,006) | (137,649)
Cash Dividends Paid on Common Stock | (110,633) | (107,434) | (105,478)
Cash Dividends Paid on Preferred Stock | (2,975) |  |
Net Cash Provided by Financing Activities | 44,232 | (116,051) | (235,255)
Net Change in Cash and Cash Equivalents | (60,328) | 29,648 | (15,675)
Cash and Cash Equivalents at Beginning of Period | 66,704 | 37,056 | 52,731
Cash and Cash Equivalents at End of Period | $ 6,376 | $ 66,704 | $ 37,056

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