FAIR VALUE - Summary of assets measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	$ 47,890	$ 53,650
U.S. treasury and federal agency
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	249	249
Collateralized mortgage obligations issued by U.S. government sponsored entities and agencies
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	8,707	9,453
Small Business Investment Company
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	1,017	930
Equity mutual fund
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale		703
Recurring
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	47,890	53,650
Equity securities not available-for-sale	692
Recurring | U.S. treasury and federal agency
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	249	249
Recurring | GNMA mortgage-backed securities – residential
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	36,453	40,836
Recurring | Collateralized mortgage obligations issued by U.S. government sponsored entities and agencies
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	8,707	9,453
Recurring | Corporate collateralized mortgage obligations and mortgage-backed securities
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	1,464	1,479
Recurring | Small Business Investment Company
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	1,017	930
Recurring | Interest rate lock and forward delivery commitments
Summary of assets measured on a recurring and nonrecurring basis
Derivative asset, Fair value	1,408	665
Recurring | Equity mutual fund
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale		703
Level 1 | Recurring
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	249	952
Equity securities not available-for-sale	692
Level 1 | Recurring | U.S. treasury and federal agency
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	249	249
Level 1 | Recurring | Equity mutual fund
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale		703
Level 2 | Recurring
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	47,641	52,698
Level 2 | Recurring | GNMA mortgage-backed securities – residential
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	36,453	40,836
Level 2 | Recurring | Collateralized mortgage obligations issued by U.S. government sponsored entities and agencies
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	8,707	9,453
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	1,464	1,479
Level 2 | Recurring | Small Business Investment Company
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	1,017	930
Level 2 | Recurring | Interest rate lock and forward delivery commitments
Summary of assets measured on a recurring and nonrecurring basis
Derivative asset, Fair value	$ 1,408	$ 665