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Mergers and Acquisitions - Pro Forma Combined Condensed Consolidated Financial Information (Details) - Metropolitan Bancgroup, Inc. - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Business Acquisition [Line Items] |  |
Net interest income - pro forma | $ 89,240 | $ 83,829
Net income - pro forma | $ 33,826 | $ 26,677
Earnings per share - pro forma: |  |
Basic (usd per share) | $ 0.69 | $ 0.59
Diluted (usd per share) | $ 0.68 | $ 0.58

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