MERGER AND ACQUISITION ACTIVITY (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Mar. 29, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Mar. 27, 2015
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired	28.00%
Merger and acquisition costs		$ 128	$ 0	$ 863	$ 0
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs				(421)
SBM Financial, Inc.
Business Acquisition [Line Items]
Business acquisition, cash consideration, per share amount (dollars per share)	$ 206.00
Business acquisition, stock for stock consideration, conversion ratio	5.421
Percentage of shares to be converted (percent)	80.00%
Pro forma assets, total	$ 3,600,000
Pro forma, loans	2,400,000
Pro forma, deposits	2,600,000
Consideration transferred	$ 135,000
Share price (dollars per share)						$ 38.60
Merger and acquisition costs		$ 128		$ 863
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares				2,806,857
Effective income tax rate increase (percent)		0.90%		3.10%
Common Stock
Business Acquisition [Line Items]
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs				$ (421)
Common Stock | SBM Financial, Inc.
Business Acquisition [Line Items]
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs				$ (421)