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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Feb. 21, 2019 | Mar. 31, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |  |  |  |
Number of shares authorized to be repurchased |  |  | 6,800,000 |  | 6,800,000 |  |
Purchase of treasury stock |  |  | $ 71.1 | $ 43.0 | $ 125.0 | $ 45.9 |
Treasury stock acquired, Shares, |  |  | 1,300,000 | 800,000 | 2,300,000 | 800,000 |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 56.32 | $ 56.28 | $ 54.95 | $ 56.32 |
Preferred stock, par value |  |  | $ 1 | $ 1.00 | $ 1 | $ 1.00 | $ 1
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 or following a regulatory capital treatment event, as defined |  |
Series B Preferred Stock [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |  |  |  |
Issuance of preferred stock |  | $ 10.0 |  |  |  |  |
Business Bancshares, Inc. [Member] |  |  |  |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |  |  |  |
Shares issued |  |  |  |  | 1,300,000 |  |

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