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Mergers and Acquisitions - Pro Forma Combined Condensed Consolidated Financial Information (Details) - Metropolitan Bancgroup, Inc. - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Business Acquisition [Line Items] |  |
Net interest income - pro forma | $ 181,629 | $ 173,508
Net income - pro forma | $ 70,536 | $ 46,912
Earnings per share - pro forma: |  |
Basic (usd per share) | $ 1.43 | $ 1.00
Diluted (usd per share) | $ 1.42 | $ 1.00

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