DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Net gains recognized on derivative instruments	$ 1,500	$ 1,200
Other assets
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Notional amount, asset derivatives	338,184		$ 566,147
Fair value of asset derivatives	8,023		6,378
Interest rate lock commitments | Other assets
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Notional amount, asset derivatives	338,184		264,359
Fair value of asset derivatives	8,023		6,253
Forward commitments to sell mortgage-backed securities | Other assets
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
Fair value of asset derivatives			$ 125
Forward commitments to sell mortgage-backed securities | Other liabilities.
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Notional amount, liability derivatives	354,405
Fair value of liability derivatives	$ 140