INVESTMENTS - Summary of unrealized loss positions (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2016 USD ($) position item	Mar. 31, 2015 USD ($)	Dec. 31, 2015 USD ($) position
Investments in an unrealized loss position
Total temporary impairment	$ 548,000
Fair Value, AFS and HTM
Less than 12 months, Fair Value	41,677,000		$ 55,314,000
12 months or more, Fair Value	20,355,000		17,421,000
Unrealized Loss, AFS and HTM
Less than 12 months, Unrealized Loss	(203,000)		(457,000)
12 months or more, Unrealized Loss	(345,000)		(356,000)
Available-for-sale Securities
Sales of investment securities available-for-sale	21,225,000	$ 11,484,000
Gains on the sale of investments available-for-sale	381	121,000
Losses on the sale of investments available-for-sale	0		0
Held-to-maturity Securities [Abstract]
Proceeds from sale of held to maturity securities	0		$ 0
Gain on sale of securities	$ 381,000	$ 121,000
U.S. Agency securities
Description and number of positions
Number of investments in an unrealized loss position, AFS	9		9
Fair Value, AFS
Less than 12 months, Fair Value	$ 23,224,000		$ 28,351,000
Unrealized Loss, AFS
Less than 12 months, Unrealized Loss	$ (77,000)		$ (181,000)
U.S. Sponsored Mortgage backed securities
Description and number of positions
Number of investments in an unrealized loss position, AFS	14		19
Fair Value, AFS
Less than 12 months, Fair Value	$ 6,019,000		$ 20,647,000
12 months or more, Fair Value	20,355,000		11,862,000
Unrealized Loss, AFS
Less than 12 months, Unrealized Loss	(11,000)		(233,000)
12 months or more, Unrealized Loss	$ (345,000)		$ (300,000)
Municipal notes
Description and number of positions
Number of investments in an unrealized loss position, AFS | position			22
Number of investments in an unrealized loss position, HTM | item	21
Fair Value, HTM
Less than 12 months, Fair Value	$ 11,439,000		$ 3,827,000
12 months or more, Fair Value			5,559,000
Unrealized Loss, HTM
Less than 12 months, Unrealized Loss	$ (110,000)		(32,000)
12 months or more, Unrealized Loss			$ (56,000)
Equity and other securities
Description and number of positions
Number of investments in an unrealized loss position, HTM | position	(1)		(1)
Fair Value, AFS
Less than 12 months, Fair Value	$ 995,000		$ 2,489,000
Unrealized Loss, AFS
Less than 12 months, Unrealized Loss	$ (5,000)		$ (11,000)