BUSINESS COMBINATIONS (Details 3) - Coastal Bankshares, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Net interest income and noninterest income	$ 266,710	$ 238,055
Net income	40,514	41,806
Net income available to common stockholders	$ 40,514	$ 41,520
Income per common share available to common stockholders - basic	$ 1.28	$ 1.51
Income per common share available to common stockholders - diluted	$ 1.26	$ 1.49
Average number of shares outstanding, basic	31,762	27,573
Average number of shares outstanding, diluted	32,127	27,858