SECURITIES - Amortized cost, fair value and tax equivalent yield of securities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
U.S. Government agency notes - After 5 years but within 10 years
Amortized cost	$ 2,497
Fair value	$ 2,504
Yield	3.67%
U.S. Government agency notes - Total
Amortized cost	$ 2,497
Fair value	$ 2,504
Yield	3.67%
Municipal bonds - Within 1 year
Amortized cost	$ 277
Fair value	$ 278
Yield	4.33%
Municipal bonds - After 1 year but within 5 years
Amortized cost	$ 259
Fair value	$ 259
Yield	3.84%
Municipal bonds - After 10 years but within 15 years
Amortized cost	$ 1,988
Fair value	$ 1,992
Yield	6.13%
Municipal bonds - Total
Amortized cost	$ 2,524
Fair value	$ 2,529
Yield	5.69%
Mortgage-backed securities - U.S. Government agency and U.S. Government-sponsored enterprises
Amortized cost	$ 35,768
Fair value	$ 35,164
Yield	2.36%
Collateralized mortgage obligations - U.S. Government agency and U.S. Government-sponsored enterprises
Amortized cost	$ 13,803
Fair value	$ 13,496
Yield	3.07%
Collateralized mortgage obligations - Non-agency
Amortized cost	$ 1,556
Fair value	$ 1,910
Yield	3.53%
SBA bonds
Amortized cost	$ 26,480
Fair value	$ 25,997
Yield	3.12%
Corporate bonds - After 5 years but within 10 years
Amortized cost	$ 3,500
Fair value	$ 3,457
Yield	5.57%
Fair value
Amortized cost	$ 86,128
Fair value	$ 85,057
Yield	3.00%