DERIVATIVE INSTRUMENTS - Fair Values of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Fair Values of Derivative Instruments
Derivative assets	$ 533	$ 1,588
Derivative liabilities	7	1,074
Interest rate swap agreements | Designated As Hedging Instrument | Other Assets
Fair Values of Derivative Instruments
Derivative assets	365	498
Interest rate swap agreements | Not Designated as Hedging Instrument | Other Assets
Fair Values of Derivative Instruments
Derivative assets	7	1,074
Interest rate swap agreements | Not Designated as Hedging Instrument | Accrued Interest and Other Liabilities
Fair Values of Derivative Instruments
Derivative liabilities	7	1,074
Commitments to originate real estate loans for sale | Not Designated as Hedging Instrument | Other Assets
Fair Values of Derivative Instruments
Derivative assets	130	14
Forward sales commitments | Not Designated as Hedging Instrument | Other Assets
Fair Values of Derivative Instruments
Derivative assets	$ 31	$ 2