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Mergers and Acquisitions - Pro Forma Combined Condensed Consolidated Financial Information (Details) - Metropolitan Bancgroup, Inc. - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Business Acquisition [Line Items] |  |
Net interest income - pro forma (unaudited) | $ 263,525 | $ 252,366
Net income - pro forma (unaudited) | $ 72,915 | $ 75,744
Earnings per share - pro forma (unaudited): |  |
Basic (usd per share) | $ 1.50 | $ 1.68
Diluted (usd per share) | $ 1.50 | $ 1.67

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