BUSINESS COMBINATIONS (Details 3) - Coastal Bankshares, Inc. [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net interest income and noninterest income	$ 86,296	$ 78,798
Net income	21,153	13,052
Net income available to common shareholders	$ 21,153	$ 13,052
Income per common share available to common shareholders - basic	$ 0.59	$ 0.38
Income per common share available to common shareholders - diluted	$ 0.59	$ 0.37
Average number of shares outstanding, basic	35,664	34,741
Average number of shares outstanding, diluted	36,040	35,043