SECURITIES - Amortized cost, fair value and tax equivalent yield of securities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($)
Municipal bonds - Within 1 year
Amortized cost	$ 305
Fair value	$ 306
Yield	6.26%
Municipal bonds - After 1 year but within 5 years
Amortized cost	$ 491
Fair value	$ 495
Yield	5.10%
Municipal bonds - After 10 years but within 15 years
Amortized cost	$ 1,839
Fair value	$ 1,852
Yield	7.01%
Municipal bonds - After 15 years
Amortized cost	$ 1,976
Fair value	$ 1,988
Yield	6.94%
Municipal bonds - Total
Amortized cost	$ 4,611
Fair value	$ 4,641
Yield	6.73%
Mortgage-backed securities - U.S. Government agency and U.S. Government-sponsored enterprises
Amortized cost	$ 49,655
Fair value	$ 49,757
Yield	2.31%
Collateralized mortgage obligations - U.S. Government agency and U.S. Government-sponsored enterprises
Amortized cost	$ 10,815
Fair value	$ 10,841
Yield	2.73%
Collateralized mortgage obligations - Non-agency
Amortized cost	$ 2,464
Fair value	$ 2,868
Yield	3.99%
SBA bonds
Amortized cost	$ 12,767
Fair value	$ 12,816
Yield	3.02%
CRA mutual funds
Amortized cost	$ 847
Fair value	$ 840
Yield	2.30%
Corporate bonds - After 5 years but within 10 years
Amortized cost	$ 3,500
Fair value	$ 3,557
Yield	5.57%
Preferred stock
Amortized cost	$ 7
Fair value	$ 188
Yield	5.49%
Securities available-for-sale
Amortized cost	$ 84,666
Fair value	$ 85,508
Yield	2.89%