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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Exercise of stock options (shares) |  |  |  |  | 61,000 |
Treasury stock purchases (shares) |  | 115,000 | 44,598 |  | 266,753 | 43,113
Cash dividends on common stock (per share) | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.32 | $ 0.32 | $ 0.32
Series D Preferred Stock [Member] |  |  |  |  |  |
Preferred stock, dividend rate |  |  | 4.50% |  |  | 4.50%
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% |  | 3.50% | 3.50%
Series I Preferred Stock [Member] |  |  |  |  |  |
Preferred stock, dividend rate | 3.00% | 3.00% | 3.00% | 3.00% | 3.00% | 3.00%
Series J Preferred Stock [Member] |  |  |  |  |  |
Preferred stock, dividend rate | 8.00% |  |  | 8.00% |  |

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