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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 11, 2020 | May 19, 2020 | Feb. 21, 2019 | Aug. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized to be repurchased |  |  |  |  |  | 13,300,000 |  |
Purchase of treasury stock |  |  |  |  |  | $ 58.3 | $ 215.4 |
Treasury stock acquired, Shares, |  |  |  |  |  | 1,700,000 | 5,900,000 |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  | $ 33.35 | $ 36.63 |
Common stock reissued |  |  |  |  |  | 1,600,000 | 1,400,000 |
Preferred stock, dividend rate percentage | 50.00% |  |  |  |  |  |  |
Preferred stock, par value |  |  |  |  |  | $ 1 | $ 1 | $ 1.00
Non-Cumulative Perpetual Preferred Stock, Series B [Member] |  |  |  |  |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |  |  |  |  |
Issuance of preferred stock |  |  | $ 150.0 |  |  |  |  |
Preferred stock, dividend rate percentage |  |  | 6.25% |  |  |  |  |
Preferred stock, par value |  |  | $ 1.00 |  |  |  |  |
Preferred stock liquidation preference per depositary share |  |  | 25 |  |  |  |  |
Preferred stock, liquidation preference per share |  |  | $ 25,000 |  |  |  |  |
Preferred stock, redemption terms |  |  |  |  |  | The Company may redeem the Series B preferred stock at its option, subject to regulatory approval, on or after March 15, 2024. |  |
Non-Cumulative Perpetual Preferred Stock, Series C [Member] |  |  |  |  |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |  |  |  |  |
Issuance of preferred stock |  | $ 225.0 |  |  |  |  |  |
Preferred stock, dividend rate percentage |  | 6.125% |  |  |  |  |  |
Preferred stock, par value |  | $ 1.00 |  |  |  |  |  |
Preferred stock liquidation preference per depositary share |  | 25 |  |  |  |  |  |
Preferred stock, liquidation preference per share |  | $ 25,000 |  |  |  |  |  |
Preferred stock, redemption terms |  |  |  |  |  | The Company may redeem the Series C preferred stock at its option, subject to regulatory approval, on or after June 15, 2025. |  |
Series B Preferred Stock [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |  |  |  |  |
Issuance of preferred stock |  |  |  |  | $ 10.0 |  |  |
Series C Preferred Stock [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |  |  |  |  |
Issuance of preferred stock |  | $ 25.0 |  |  |  |  |  |
Business Bancshares, Inc. [Member] |  |  |  |  |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |  |  |  |  |
Stock issued for acquisition |  |  |  | 2,000,000.0 |  |  |  |

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