DERIVATIVE INSTRUMENTS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Notional amount, asset derivatives	$ 436,875,000		$ 443,706,000
Fair value of asset derivatives	4,305,000		3,350,000
Net gains (losses) recognized on derivative instruments	626,000	$ 1,300,000
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	239,119,000		222,654,000
Fair value of asset derivatives	4,305,000		3,350,000
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	197,756,000		221,052,000
Notional amount, liability derivatives	28,266,000
Fair value of liability derivatives	329,000
Interest rate swap contracts
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Notional amount of interest rate swaps	8,800,000		9,000,000.0
Interest rate swap contracts | Other assets
Fair value of the Company's derivative financial instruments as well as their classification on the consolidated statements of condition
Fair value of asset derivatives	$ 888,000		$ 306,000