BUSINESS COMBINATIONS (Details 3) - Coastal Bankshares, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Net interest income and noninterest income	$ 329,248	$ 286,573
Net income	72,835	47,994
Net income available to common stockholders	$ 72,835	$ 47,994
Income per common share available to common stockholders - basic	$ 2.09	$ 1.4
Income per common share available to common stockholders - diluted	$ 2.07	$ 1.38
Average number of shares outstanding, basic	34,841	34,311
Average number of shares outstanding, diluted	35,196	34,676