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Consolidated Statements of Changes in Shareholders' Equity - Unaudited (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C, par value $1.00 per share |  |  |  |
Preferred stock, dividends, per share, cash paid (usd per share) | $ 0.4375 | $ 0.4375 | $ 0.8750 | $ 0.8750
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, par value $1.00 per share |  |  |  |
Preferred stock, dividends, per share, cash paid (usd per share) | 0.40625 | 0.40625 | 0.81250 | 0.81250
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, par value $1.00 per share |  |  |  |
Preferred stock, dividends, per share, cash paid (usd per share) | 0.403125 | 0.403125 | 0.806250 | 0.806250
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, par value $1.00 per share |  |  |  |
Preferred stock, dividends, per share, cash paid (usd per share) | $ 0.375 | $ 0.375 | $ 0.750 | $ 0.750

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