MERGERS AND ACQUISITIONS - Pro Forma Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($) $ / shares shares
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Total interest and non-interest income	$ 212,531
East Carolina Bancorp, Inc
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net interest income	157,805
Net income	34,370
Net income available to common shareholders	$ 31,934
Basic income per common share (in dollars per share) | $ / shares	$ 1.02
Diluted income per common share (in dollars per share) | $ / shares	$ 1.02
Weighted average basic common shares outstanding (in shares) | shares	31,295,562
Weighted average diluted common shares outstanding (in shares) | shares	31,375,585