SECURITIES - Composition of securities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Available-for-sale
Total securities available-for-sale	$ 118,664	$ 126,287
Amortized cost (1)
Available-for-sale
U.S. Treasury notes	2,496	2,496
U.S. Government Agency notes	7,514	7,515
Municipal bonds	44,235	45,395
Mortgage backed securities, U.S. Government Agencies	42,782	47,465
Collateralized mortgage obligations, U.S. Government Agencies	4,689	5,131
Non-agency	10,292	11,081
SBA bonds	2,589	2,781
Preferred Stock	20	20
Total securities available-for-sale	114,617	121,884
Federal Home Loan Bank of Boston stock	5,340	5,747
Gross un-realized gains
Available-for-sale
U.S. Treasury notes	223	237
U.S. Government Agency notes	183	211
Municipal bonds	1,883	2,138
Mortgage backed securities, U.S. Government Agencies	1,204	1,284
Collateralized mortgage obligations, U.S. Government Agencies	63	66
Non-agency	462	494
SBA bonds	92	82
Preferred Stock	291	147
Total securities available-for-sale	4,401	4,659
Federal Home Loan Bank of Boston stock
Gross un-realized losses
Available-for-sale
U.S. Treasury notes
U.S. Government Agency notes
Municipal bonds	(262)	(168)
Mortgage backed securities, U.S. Government Agencies	(28)	(20)
Collateralized mortgage obligations, U.S. Government Agencies
Non-agency	(64)	(68)
SBA bonds
Preferred Stock
Total securities available-for-sale	(354)	(256)
Federal Home Loan Bank of Boston stock
Fair value
Available-for-sale
U.S. Treasury notes	2,719	2,733
U.S. Government Agency notes	7,697	7,726
Municipal bonds	45,856	47,365
Mortgage backed securities, U.S. Government Agencies	43,958	48,729
Collateralized mortgage obligations, U.S. Government Agencies	4,752	5,197
Non-agency	10,690	11,507
SBA bonds	2,681	2,863
Preferred Stock	311	167
Total securities available-for-sale	118,664	126,287
Federal Home Loan Bank of Boston stock	$ 5,340	$ 5,747