SECURITIES - Amortized cost, fair value and tax equivalent yield of securities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Municipal bonds - Within 1 year
Amortized cost	$ 257
Fair value	$ 258
Yield	4.55%
Municipal bonds - After 1 year but within 5 years
Amortized cost	$ 543
Fair value	$ 547
Yield	3.25%
Municipal bonds - After 10 years but within 15 years
Amortized cost	$ 2,661
Fair value	$ 2,684
Yield	4.48%
Municipal bonds - After 15 years
Amortized cost	$ 3,067
Fair value	$ 3,110
Yield	4.51%
Municipal bonds - Total
Amortized cost	$ 6,528
Fair value	$ 6,599
Yield	4.40%
Mortgage-backed securities - U.S. Government agency and U.S. Government-sponsored enterprises
Amortized cost	$ 48,866
Fair value	$ 48,964
Yield	2.33%
Collateralized mortgage obligations - U.S. Government agency and U.S. Government-sponsored enterprises
Amortized cost	$ 8,694
Fair value	$ 8,759
Yield	2.64%
Collateralized mortgage obligations - Non-agency
Amortized cost	$ 2,733
Fair value	$ 3,144
Yield	3.99%
SBA bonds
Amortized cost	$ 10,488
Fair value	$ 10,508
Yield	2.99%
CRA mutual funds
Amortized cost	$ 842
Fair value	$ 831
Yield	5.01%
Corporate bonds - After 5 years but within 10 years
Amortized cost	$ 2,000
Fair value	$ 2,045
Yield	5.50%
Preferred stock
Amortized cost	$ 7
Fair value	$ 166
Yield	5.48%
Securities available-for-sale
Amortized cost	$ 80,158
Fair value	$ 81,016
Yield	2.78%