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Mergers and Acquisitions (Details 2) - Metropolitan Bancgroup, Inc. - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |
Net interest income | $ 356,787 | $ 340,796
Net income | $ 89,554 | $ 102,881
Earnings per share, basic (usd per share) | $ 1.82 | $ 2.21
Earnings per share, diluted (usd per share) | $ 1.81 | $ 2.19

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