DERIVATIVE INSTRUMENTS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Notional amount, asset derivatives	$ 566,147,000	$ 257,023,000
Fair value of asset derivatives	6,378,000	6,029,000
Net gains recognized on derivative instruments	351,000	6,000,000	$ 97,000
Interest rate lock commitments
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Notional amount, asset derivatives	264,359,000	257,023,000
Fair value of asset derivatives	6,253,000	6,029,000
Forward commitments to sell mortgage-backed securities
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Notional amount, asset derivatives	301,788,000
Notional amount, liability derivatives		278,313,000
Fair value of asset derivatives	$ 125,000
Fair value of liability derivatives		$ 2,000