5. INVESTMENT SECURITIES - Amortized Cost and Fair Value Of Investment Securities Contractual Maturity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Investment securities activity
Due in one year or less, Amortized Cost
Due after five years through ten years, Amortized Cost	14,026
Due after ten years, Amortized Cost	56,402
Amortized Cost, Total	72,612	$ 70,702
Due in one year or less, Fair Value
Due after five years through ten years, Fair Value	14,149
Due after ten years, Fair Value	55,684
Approximate Fair Value	$ 72,010	$ 70,011
Due after one year through five years, Weighted Average Yield		1.85%
Due after five years through ten years, Weighted Average Yield	2.64%
Due after ten years, Weighted Average Yield	2.04%
Weighted Average Yield, Total	2.16%