FAIR VALUE OF ASSETS AND LIABILITIES - Carrying value and estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Carrying value
Financial Assets
Cash and cash equivalents	$ 50,420	$ 36,105
Securities available-for-sale	79,417	91,312
Federal Home Loan Bank stock	3,515	3,515
Loans held-for-sale	300	568
Loans receivable, net	677,726	673,330
Accrued interest receivable	2,292	2,334
Financial Liabilities
Demand (non-interest-bearing)	171,022	161,386
Demand (interest-bearing)	118,293	117,169
Money market	173,488	174,274
Savings and other	123,697	121,387
Certificates of deposit	134,234	141,210
Deposits	720,734	715,426
Repurchase agreements	2,771	4,163
FHLBB advances	28,033	28,813
Capital lease liability	423	424
Accrued interest payable	158	166
Estimated fair value
Financial Assets
Cash and cash equivalents	50,420	36,105
Securities available-for-sale	79,417	91,312
Federal Home Loan Bank stock	3,515	3,515
Loans held-for-sale	305	572
Loans receivable, net	690,776	683,845
Accrued interest receivable	2,292	2,334
Financial Liabilities
Demand (non-interest-bearing)	171,022	161,386
Demand (interest-bearing)	118,293	117,169
Money market	173,488	174,274
Savings and other	123,697	121,387
Certificates of deposit	135,709	142,261
Deposits	722,209	716,477
Repurchase agreements	2,771	4,163
FHLBB advances	30,176	30,626
Capital lease liability	895	929
Accrued interest payable	158	166
Fair Value Measurements Using - Level 1
Financial Assets
Cash and cash equivalents	50,420	36,105
Securities available-for-sale	$ 313	$ 327
Federal Home Loan Bank stock
Loans held-for-sale
Loans receivable, net
Accrued interest receivable
Financial Liabilities
Demand (non-interest-bearing)
Demand (interest-bearing)
Money market
Savings and other
Certificates of deposit
Deposits
Repurchase agreements
FHLBB advances
Capital lease liability
Accrued interest payable
Fair Value Measurements Using - Level 2
Financial Assets
Cash and cash equivalents
Securities available-for-sale	$ 79,104	$ 90,985
Federal Home Loan Bank stock	$ 3,515	$ 3,515
Loans held-for-sale
Loans receivable, net
Accrued interest receivable
Financial Liabilities
Demand (non-interest-bearing)
Demand (interest-bearing)
Money market
Savings and other
Certificates of deposit
Deposits
Repurchase agreements
FHLBB advances
Capital lease liability
Accrued interest payable
Fair Value Measurements Using - Level 3
Financial Assets
Cash and cash equivalents
Securities available-for-sale
Federal Home Loan Bank stock
Loans held-for-sale	$ 305	$ 572
Loans receivable, net	690,776	683,845
Accrued interest receivable	2,292	2,334
Financial Liabilities
Demand (non-interest-bearing)	171,022	161,386
Demand (interest-bearing)	118,293	117,169
Money market	173,488	174,274
Savings and other	123,697	121,387
Certificates of deposit	135,709	142,261
Deposits	722,209	716,477
Repurchase agreements	2,271	4,163
FHLBB advances	30,176	30,626
Capital lease liability	895	929
Accrued interest payable	$ 158	$ 166