FAIR VALUE - Summary of assets measured at fair value on recurring basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	$ 45,492	$ 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
Securities issued by U.S. government sponsored entities and agencies
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	8,281	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	45,492	53,650
Equity securities not available-for-sale	687
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	34,522	40,836
Recurring | Securities issued by U.S. government sponsored entities and agencies
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	8,281	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	1,423	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	885	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	687
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	45,243	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	34,522	40,836
Level 2 | Recurring | Securities issued by U.S. government sponsored entities and agencies
Summary of assets measured on a recurring and nonrecurring basis
Total securities available-for-sale	8,281	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	1,423	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	$ 885	$ 665