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Shareholders' Equity | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity Note [Abstract] |
Shareholders' Equity | Shareholders’ Equity Dividends The following summarizes the dividend activity for the year ended December 31, 2020:
Declared |  | Regular Cash Dividends Per Common Share |  | Special Cash Dividends Per Common Share |  | Record Date |  | Paid Date
January 23, 2020 |  | $ | 0.28 |  |  | $ | 0.22 |  |  | February 5, 2020 |  | February 19, 2020
April 30, 2020 |  | $ | 0.28 |  |  | $ | — |  |  | May 14, 2020 |  | May 28, 2020
July 23, 2020 |  | $ | 0.28 |  |  | $ | — |  |  | August 5, 2020 |  | August 19, 2020
October 29, 2020 |  | $ | 0.28 |  |  | $ | — |  |  | November 11, 2020 |  | November 25, 2020
Subsequent to year end, on January 28, 2021, the Company declared a regular quarterly cash dividend of $0.28 per common share payable on February 24, 2021, to shareholders of record at the close of business on February 10, 2021. The payment of cash dividends is subject to federal regulatory requirements for capital levels and other restrictions. In addition, the cash dividends paid by Columbia Bank to the Company are subject to both federal and state regulatory requirements. Share Repurchase Program: For the year ended December 31, 2020, the Company repurchased 731 thousand shares of common stock at an average price of $27.36 per share under the Company’s previous share repurchase authorization, which expired in May 2020. On October 28, 2020, the board of directors approved a stock repurchase program to purchase up to 3.5 million shares, up to a maximum aggregate purchase price of $100.0 million. As of December 31, 2020, no shares have been purchased under this plan.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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