ACQUISITIONS - Acquisition of Cheviot Financial Corp. (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Jun. 30, 2016 USD ($) $ / shares	Dec. 31, 2015 item $ / shares	Nov. 20, 2015 $ / shares	Sep. 30, 2015 USD ($)	Jun. 30, 2015 $ / shares	Jun. 30, 2014 $ / shares	Jun. 30, 2013 $ / shares	Mar. 31, 2013 $ / shares
ACQUISITIONS
Closing price of common stock (in dollars per share) | $ / shares		$ 19.89	$ 23.56		$ 19.89	$ 16.53	$ 13.79	$ 13.38
Cheviot Financial Corp.
ACQUISITIONS
Number of tiers in mutual holding company | item		2
Number of full service offices | item		12
Assets of acquiree				$ 576,563
Loans				365,067
Deposits				459,856
Equity				$ 96,890
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%
Approximate value of transaction	$ 107,400