FAIR VALUE MEASUREMENTS - Carrying values and estimated fair values of financial instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial Assets
Cash and due from banks	$ 10,297	$ 9,082
Carrying value
Financial Assets
Cash and due from banks	43,574	36,886
Securities available-for-sale	126,287	155,794
Security held-to-maturity		50
Federal Home Loan Bank stock	5,747	6,032
Loans held-for-sale	1,879	948
Loans receivable net	388,758	370,766
Accrued interest receivable	1,818	2,126
Financial Liabilities
Demand (non-interest-bearing)	98,850	82,202
Demand (interest-bearing)	65,991	66,332
Money market	128,501	124,566
Savings and other	103,985	94,503
Certificates of deposit	93,888	103,703
Deposits	491,215	471,306
FHLBB advances	31,980	54,615
Repurchase agreements	1,784	12,148
Accrued interest payable	196	271
Assets at fair value
Financial Assets
Cash and due from banks	43,574	36,886
Securities available-for-sale	126,287	155,794
Security held-to-maturity		52
Federal Home Loan Bank stock	5,747	6,032
Loans held-for-sale	1,893	955
Loans receivable net	389,292	373,071
Accrued interest receivable	1,818	2,126
Financial Liabilities
Demand (non-interest-bearing)	98,850	82,202
Demand (interest-bearing)	65,991	66,332
Money market	128,501	124,566
Savings and other	103,985	94,503
Certificates of deposit	94,894	104,466
Deposits	492,221	472,069
FHLBB advances	35,363	58,808
Repurchase agreements	1,784	12,148
Accrued interest payable	196	271
Fair Value Measurements at Reporting Date Using, Level 1
Financial Assets
Cash and due from banks	43,574	36,886
Securities available-for-sale	167	116
Security held-to-maturity
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
FHLBB advances
Repurchase agreements
Accrued interest payable
Fair Value Measurements at Reporting Date Using, Level 2
Financial Assets
Cash and due from banks
Securities available-for-sale	126,120	155,678
Security held-to-maturity		52
Federal Home Loan Bank stock	5,747	6,032
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
FHLBB advances
Repurchase agreements
Accrued interest payable
Fair Value Measurements at Reporting Date Using, Level 3
Financial Assets
Cash and due from banks
Securities available-for-sale	126,120
Security held-to-maturity
Federal Home Loan Bank stock	5,747
Loans held-for-sale		955
Loans receivable net		373,071
Accrued interest receivable		2,126
Financial Liabilities
Demand (non-interest-bearing)		82,202
Demand (interest-bearing)		66,332
Money market		124,566
Savings and other		94,503
Certificates of deposit		104,466
Deposits		472,069
FHLBB advances		58,808
Repurchase agreements		12,148
Accrued interest payable		$ 271

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure. This item represents the aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits among others.

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A bank's noninterest bearing demand deposits in other banks (such as correspondents).

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Amount of money in noninterest-bearing domestic accounts that entitle the depositor to withdraw funds at any time without prior notice, also known as demand deposits.

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An amount representing an agreement for an unconditional promise by the maker to pay the Company (holder) a definite sum of money within one year from the balance sheet date (or the normal operating cycle, whichever is longer), net of any write-downs taken for collection uncertainty on the part of the holder. Such amount may include accrued interest receivable in accordance with the terms of the debt. The debt also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. This amount does not include amounts related to receivables held-for-sale.

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The amount at risk under repurchase agreements is defined as the excess of carrying amount (or market value, if higher than the carrying amount or if there is no carrying amount) of the securities or other assets sold under agreement to repurchase, including accrued interest plus any cash or other assets on deposit to secure the repurchase obligation, over the amount of the repurchase liability (adjusted for accrued interest).

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