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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Statement of Stockholders' Equity [Abstract] |  |  |  |
Stock option exercise/stock unit conversions (114,252 shares QTD and 628,076 shares YTD during 2021 and 77,308 shares QTD and 143,523 shares YTD during 2020) | 114,252 | 77,308 | 628,076 | 143,523
Redemption of series A preferred stock (6,000,000 shares) |  |  |  | 6,000,000
Purchase of treasury stock (11,625 shares during 2021 and 181,825 shares during 2020) |  |  | 11,625 | 181,825
Treasury stock issued to the 401(k) stock purchase plan (18,555 shares YTD in 2021 and 38,943 shares QTD and YTD in 2020) |  | 38,943 | 18,555 | 38,943
Cash dividend - preferred stock (Approximately $11.13 per share QTD and $25.46 per share YTD during 2021 and $0.34 per share QTD and YTD during 2020) | $ 11.13 |  | $ 25.46 | $ 0.34
Cash dividend - Preferred Stock Dividends equivalent Per depositary Share Declared ($0.28 QTD and $0.64 YTD during 2021) | 0.28 |  | 0.64 |
Cash dividends - common stock ($0.72 per share QTD and $1.44 per share YTD during 2021 and $0.71 per share QTD and $1.42 per share YTD during 2020) | $ 0.72 | $ 0.71 | $ 1.44 | $ 1.42

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