FAIR VALUE - Summary of assets measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	$ 52,500	$ 58,903
U.S. Treasury debt
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	258	254
Recurring
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	52,500	58,903
Equity securities	726	713
Recurring | U.S. Treasury debt
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	258	254
Recurring | Corporate collateralized mortgage obligations and mortgage-backed securities
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	8,636	10,420
Recurring | Interest rate lock and forward delivery commitments
Summary of assets measured on a recurring and nonrecurring basis
Derivative asset, Fair value	4,025	1,184
Recurring | GNMA
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	40,871	45,312
Recurring | FNMA
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	2,735	2,917
Level 1 | Recurring
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	258	254
Equity securities	726	713
Level 1 | Recurring | U.S. Treasury debt
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	258	254
Level 2 | Recurring
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	52,242	58,649
Level 2 | Recurring | Corporate collateralized mortgage obligations and mortgage-backed securities
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	8,636	10,420
Level 2 | Recurring | Interest rate lock and forward delivery commitments
Summary of assets measured on a recurring and nonrecurring basis
Derivative asset, Fair value	4,025	1,184
Level 2 | Recurring | GNMA
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	40,871	45,312
Level 2 | Recurring | FNMA
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	$ 2,735	$ 2,917