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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Exercise of stock options (shares) |  |  |  |  | 70,723 | [1] | 500
Exercise of stock options (shares) |  |  |  |  | 39,291 |  |
Cash dividends on common stock (per share) | $ 0.16 | $ 0.16 | $ 0.14 | $ 0.14 |  |  | $ 0.56
Treasury stock purchases (shares) |  |  |  |  | 301,024 |  | 500,000
Series C Preferred Stock [Member] |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  | 6.00%
Series D Preferred Stock [Member] |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 4.50% |  | 4.50%
Series F Preferred Stock [Member] |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  |  |  | 6.00%
Series G Preferred Stock [Member] |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 6.00% |  | 6.00%
Series H Preferred Stock [Member] |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 3.50% |  | 3.50%
Series I Preferred Stock [Member] |  |  |  |  |  |  |
Preferred stock, dividend rate |  |  |  |  | 3.00% |  |
[1] | Includes 31,432 cashless exercise of options.

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