FAIR VALUE - Summary of Assets and Liabilities measured on a Non-Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019
Assets measured at fair value on non-recurring basis
Other real estate owned	$ 0	$ 0
Carrying Amount
Assets measured at fair value on non-recurring basis
Loans held for sale	12,643	12,643	$ 12,600
Fair Value
Assets measured at fair value on non-recurring basis
Loans held for sale	12,643	12,643
Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets measured at fair value on non-recurring basis
Loans held for sale		0
Significant Other Observable Inputs (Level 2)
Assets measured at fair value on non-recurring basis
Loans held for sale		0
Significant Unobservable Inputs (Level 3)
Assets measured at fair value on non-recurring basis
Loans held for sale	12,643	12,643
Non-recurring basis | Carrying Amount
Assets measured at fair value on non-recurring basis
Loans held for sale	12,643	12,643
Collateral dependent loans	2,902
Impaired loans		6,981
Non-recurring basis | Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets measured at fair value on non-recurring basis
Collateral dependent loans	0
Impaired loans		0
Non-recurring basis | Significant Other Observable Inputs (Level 2)
Assets measured at fair value on non-recurring basis
Collateral dependent loans	0
Impaired loans		0
Non-recurring basis | Significant Unobservable Inputs (Level 3)
Assets measured at fair value on non-recurring basis
Loans held for sale	12,643	12,643
Collateral dependent loans	$ 2,902
Impaired loans		$ 6,981