FAIR VALUE OF ASSETS AND LIABILITIES - Carrying value and estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Carrying value
Financial Assets
Cash and cash equivalents	$ 31,503	$ 62,118
Securities available-for-sale	79,034	76,694
Federal Home Loan Bank stock	3,117	3,176
Loans held-for-sale	183	763
Loans receivable, net	728,845	699,018
Accrued interest receivable	2,451	2,307
Cash surrender value of life insurance	13,775	13,685
Financial Liabilities
Demand (non-interest-bearing)	192,184	201,340
Demand (interest-bearing)	122,814	125,465
Money market	192,357	183,783
Savings and other	126,214	119,651
Certificates of deposit	122,089	124,294
Deposits	755,658	754,533
Repurchase agreements	2,620	3,914
FHLBB advances	27,031	26,979
Subordinated debt	9,770	9,764
Note payable	365	376
Capital lease liability	420	422
Accrued interest payable	120	150
Estimated fair value
Financial Assets
Cash and cash equivalents	31,503	62,118
Securities available-for-sale	79,034	76,694
Federal Home Loan Bank stock	3,117	3,176
Loans held-for-sale	183	778
Loans receivable, net	732,699	707,154
Accrued interest receivable	2,451	2,307
Cash surrender value of life insurance	13,775	13,685
Financial Liabilities
Demand (non-interest-bearing)	192,184	201,340
Demand (interest-bearing)	122,814	125,465
Money market	192,357	183,783
Savings and other	126,214	119,651
Certificates of deposit	122,952	125,437
Deposits	756,521	755,676
Repurchase agreements	2,620	3,914
FHLBB advances	29,046	28,559
Subordinated debt	10,190	9,764
Note payable	404	405
Capital lease liability	895	870
Accrued interest payable	120	150
Fair Value Measurements Using - Level 1
Financial Assets
Cash and cash equivalents	31,503	62,118
Securities available-for-sale	$ 235	$ 246
Federal Home Loan Bank stock
Loans held-for-sale
Loans receivable, net
Accrued interest receivable
Cash surrender value of life insurance	$ 13,775	$ 13,685
Financial Liabilities
Demand (non-interest-bearing)
Demand (interest-bearing)
Money market
Savings and other
Certificates of deposit
Deposits
Repurchase agreements
FHLBB advances
Subordinated debt
Note payable
Capital lease liability
Accrued interest payable
Fair Value Measurements Using - Level 2
Financial Assets
Cash and cash equivalents
Securities available-for-sale	$ 78,799	$ 76,448
Federal Home Loan Bank stock	$ 3,117	$ 3,176
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
Subordinated debt
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	$ 183	$ 788
Loans receivable, net	732,699	707,154
Accrued interest receivable	$ 2,451	$ 2,307
Cash surrender value of life insurance
Financial Liabilities
Demand (non-interest-bearing)	$ 192,184	$ 201,340
Demand (interest-bearing)	122,814	125,465
Money market	192,357	183,783
Savings and other	126,214	119,651
Certificates of deposit	122,952	125,437
Deposits	756,521	755,676
Repurchase agreements	2,620	3,914
FHLBB advances	29,046	28,559
Subordinated debt	10,190	9,764
Note payable	404	405
Capital lease liability	895	870
Accrued interest payable	$ 120	$ 150