SECURITIES - Amortized cost, fair value and tax equivalent yield of securities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
U.S. Government agency notes - After 5 years but within 10 years
Amortized cost	$ 4,991
Fair value	$ 4,963
Yield	3.59%
U.S. Government agency notes - Total
Amortized cost	$ 4,991
Fair value	$ 4,963
Yield	3.59%
Municipal bonds - Within 1 year
Amortized cost	$ 347
Fair value	$ 347
Yield	2.37%
Municipal bonds - After 1 year but within 5 years
Amortized cost	$ 137
Fair value	$ 137
Yield	2.78%
Municipal bonds - After 10 years but within 15 years
Amortized cost	$ 4,373
Fair value	$ 4,374
Yield	4.55%
Municipal bonds - After 15 years
Amortized cost	$ 535
Fair value	$ 532
Yield	3.35%
Municipal bonds - Total
Amortized cost	$ 5,392
Fair value	$ 5,390
Yield	4.29%
Mortgage-backed securities - U.S. Government agency and U.S. Government-sponsored enterprises
Amortized cost	$ 34,845
Fair value	$ 34,399
Yield	2.43%
Collateralized mortgage obligations - U.S. Government agency and U.S. Government-sponsored enterprises
Amortized cost	$ 18,255
Fair value	$ 17,852
Yield	3.00%
Collateralized mortgage obligations - Non-agency
Amortized cost	$ 1,423
Fair value	$ 1,797
Yield	5.36%
SBA bonds
Amortized cost	$ 28,607
Fair value	$ 27,850
Yield	3.06%
Corporate bonds - After 5 years but within 10 years
Amortized cost	$ 3,500
Fair value	$ 3,529
Yield	5.57%
Fair value
Amortized cost	$ 97,013
Fair value	$ 95,780
Yield	3.05%