SUBSEQUENT EVENT (Details) - Jul. 06, 2015 - Subsequent Event [Member] - Merger Agreement [Member] - First National Bankshares Corporation [Member] - USD ($) $ / shares in Units, $ in Millions	Total
Subsequent Event [Line Items]
Value of single bank holding	$ 261.0
Purchase price of entity acquired	$ 26.5
Purchase price of common stock (in dollars per share)	$ 31.82
Number of shares issued in acquisition (in shares)	1,400,000