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ACQUISITIONS - PRO FORMA INFORMATION (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Business Combinations [Abstract] |  |
Net interest income | $ 259,494 | $ 249,533
Non-interest income | 137,395 | 125,855
Net income | $ 79,011 | $ 60,852
Pro forma earnings per share, basic (USD per share) | $ 2.25 | $ 1.85
Pro forma earnings per share, diluted (USD per share) | $ 2.24 | $ 1.84

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