FAIR VALUE OF ASSETS AND LIABILITIES - Carrying value and estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Carrying value
Financial Assets
Cash and cash equivalents	$ 81,695	$ 36,105
Securities available-for-sale	80,371	91,312
Federal Home Loan Bank stock	3,515	3,515
Loans held-for-sale	573	568
Loans receivable, net	687,719	673,330
Accrued interest receivable	2,296	2,334
Cash surrender value of life insurance	13,591	13,314
Financial Liabilities
Demand (non-interest-bearing)	194,618	161,386
Demand (interest-bearing)	129,779	117,169
Money market	184,409	174,274
Savings and other	123,017	121,387
Certificates of deposit	129,656	141,210
Deposits	761,479	715,426
Repurchase agreements	4,210	4,163
FHLBB advances	26,928	28,813
Note payable	380
Capital lease liability	422	424
Accrued interest payable	121	166
Estimated fair value
Financial Assets
Cash and cash equivalents	81,695	36,105
Securities available-for-sale	80,371	91,312
Federal Home Loan Bank stock	3,515	3,515
Loans held-for-sale	584	572
Loans receivable, net	695,147	683,845
Accrued interest receivable	2,296	2,334
Cash surrender value of life insurance	13,591	13,314
Financial Liabilities
Demand (non-interest-bearing)	194,618	161,386
Demand (interest-bearing)	129,779	117,169
Money market	184,409	174,274
Savings and other	123,017	121,387
Certificates of deposit	130,765	142,261
Deposits	762,588	716,477
Repurchase agreements	4,210	4,163
FHLBB advances	28,988	30,626
Note payable	409
Capital lease liability	898	929
Accrued interest payable	121	166
Fair Value Measurements Using - Level 1
Financial Assets
Cash and cash equivalents	81,695	36,105
Securities available-for-sale	$ 375	$ 327
Federal Home Loan Bank stock
Loans held-for-sale
Loans receivable, net
Accrued interest receivable
Cash surrender value of life insurance	$ 13,591	$ 13,314
Financial Liabilities
Demand (non-interest-bearing)
Demand (interest-bearing)
Money market
Savings and other
Certificates of deposit
Deposits
Repurchase agreements
FHLBB advances
Note payable
Capital lease liability
Accrued interest payable
Fair Value Measurements Using - Level 2
Financial Assets
Cash and cash equivalents
Securities available-for-sale	$ 79,996	$ 90,985
Federal Home Loan Bank stock	$ 3,515	$ 3,515
Loans held-for-sale
Loans receivable, net
Accrued interest receivable
Cash surrender value of life insurance
Financial Liabilities
Demand (non-interest-bearing)
Demand (interest-bearing)
Money market
Savings and other
Certificates of deposit
Deposits
Repurchase agreements
FHLBB advances
Note payable
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	$ 584	$ 572
Loans receivable, net	695,147	683,845
Accrued interest receivable	$ 2,296	$ 2,334
Cash surrender value of life insurance
Financial Liabilities
Demand (non-interest-bearing)	$ 194,618	$ 161,386
Demand (interest-bearing)	129,779	117,169
Money market	184,409	174,274
Savings and other	123,017	121,387
Certificates of deposit	130,765	142,261
Deposits	762,588	716,477
Repurchase agreements	4,210	4,163
FHLBB advances	28,988	30,626
Note payable	409
Capital lease liability	898	929
Accrued interest payable	$ 121	$ 166