FAIR VALUE MEASUREMENTS - Fair value measurement on recurring basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
U.S. government agencies - GSEs [Member]
Total investment AFS	$ 9,996	$ 9,837
Mortgage-backed securities - GSEs [Member]
Total investment AFS	47,743	22,983
Total Investment Held For Sale [Member]
Total investment AFS	72,367	51,533
Municipal bonds [Member]
Total investment AFS	12,329	16,991
Corporate Debt Securities [Member]
Total investment AFS	2,299	1,722
Fair Value, Inputs, Level 1 [Member] | U.S. government agencies - GSEs [Member]
Total investment AFS	0	0
Fair Value, Inputs, Level 1 [Member] | Mortgage-backed securities - GSEs [Member]
Total investment AFS	0	0
Fair Value, Inputs, Level 1 [Member] | Total Investment Held For Sale [Member]
Total investment AFS	0	0
Fair Value, Inputs, Level 1 [Member] | Municipal bonds [Member]
Total investment AFS	0	0
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
Total investment AFS	0	0
Fair Value, Inputs, Level 2 [Member] | U.S. government agencies - GSEs [Member]
Total investment AFS	9,996	9,837
Fair Value, Inputs, Level 2 [Member] | Mortgage-backed securities - GSEs [Member]
Total investment AFS	47,743	22,983
Fair Value, Inputs, Level 2 [Member] | Total Investment Held For Sale [Member]
Total investment AFS	72,367	51,533
Fair Value, Inputs, Level 2 [Member] | Municipal bonds [Member]
Total investment AFS	12,329	16,991
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
Total investment AFS	2,299	1,722
Fair Value, Inputs, Level 3 [Member] | U.S. government agencies - GSEs [Member]
Total investment AFS	0	0
Fair Value, Inputs, Level 3 [Member] | Mortgage-backed securities - GSEs [Member]
Total investment AFS	0	0
Fair Value, Inputs, Level 3 [Member] | Total Investment Held For Sale [Member]
Total investment AFS	0	0
Fair Value, Inputs, Level 3 [Member] | Municipal bonds [Member]
Total investment AFS	0	0
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
Total investment AFS	$ 0	$ 0