BUSINESS COMBINATIONS (Details 3) - Coastal Bankshares, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net interest income and noninterest income	$ 85,931	$ 77,325	$ 247,697	$ 210,556
Net income	21,557	17,076	54,658	32,621
Net income available to common stockholders	$ 21,557	$ 17,076	$ 54,658	$ 32,621
Income per common share available to common stockholders - basic	$ 0.62	$ 0.49	$ 1.57	$ 0.95
Income per common share available to common stockholders - diluted	$ 0.61	$ 0.49	$ 1.56	$ 0.95
Average number of shares outstanding, basic	34,870	34,744	34,817	34,163
Average number of shares outstanding, diluted	35,195	35,102	35,131	34,511