ACQUISITIONS - Acquisition of Cheviot Financial Corp. (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2016 USD ($) $ / shares	Mar. 31, 2016 USD ($) $ / shares	Dec. 31, 2015 item $ / shares	Jun. 30, 2015 $ / shares
ACQUISITIONS
Closing price of common stock (in dollars per share) | $ / shares		$ 19.89	$ 19.89	$ 19.89
Cheviot Financial Corp.
ACQUISITIONS
Number of tiers in mutual holding company | item			2
Number of full service offices | item			12
Assets of acquiree		$ 572,000
Loans		376,171
Deposits		454,885
Equity		$ 96,469
Cheviot Financial Corp. | Forecast
ACQUISITIONS
Ratio of shares to be received by acquiree shareholders	0.6916
Cash received in exchange for each common stock owned (in dollars per share) | $ / shares	$ 15.00
Total consideration in common stock (as a percent)	50.00%
Total consideration in cash (as a percent)	50.00%
Closing price of common stock (in dollars per share) | $ / shares	$ 23.56
Approximate value of transaction	$ 107,400