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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 16, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Statement of Stockholders' Equity [Abstract] |  |  |  |  |
Stock option exercises/stock unit conversions (shares) |  | 77,308 | 53,035 | 143,523 | 153,900
Redemption of preferred stock (6,000,000 shares) | 6,000,000 |  |  | 6,000,000 |
Treasury Stock, Shares, Acquired |  |  | 496,307 | 181,825 | 501,658
Treasury stock issued to the 401(k) stock purchase plan (38,943 shares) |  | 38,943 |  | 38,943 |
Approximate cash dividends declared on preferred stock, per share |  |  | $ 0.33 | $ 0.34 | $ 0.67
Cash dividends declared on common stock, per share |  | $ 0.71 | $ 0.71 | $ 1.42 | $ 1.38

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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=27012166&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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