FAIR VALUE OF ASSETS AND LIABILITIES - Carrying values and estimated fair values of financial instruments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Carrying value
Financial Assets
Cash and due from banks	$ 32,960	$ 43,574
Interest-bearing time deposits	4,233
Securities available-for-sale	106,610	126,287
Federal Home Loan Bank stock	5,340	5,747
Loans held-for-sale	864	1,879
Loans receivable net	416,729	388,758
Accrued interest receivable	2,002	1,818
Financial Liabilities
Demand (non-interest-bearing)	90,203	98,850
Demand (interest-bearing)	73,606	65,991
Money market	134,052	128,501
Savings and other	104,331	103,985
Certificates of deposit	89,848	93,888
Deposits	492,040	491,215
FHLBB advances	31,187	31,980
Repurchase agreements	2,980	1,784
Accrued interest payable	159	196
Assets at fair value
Financial Assets
Cash and due from banks	32,960
Interest-bearing time deposits	4,233
Securities available-for-sale	106,610
Federal Home Loan Bank stock	5,340
Loans held-for-sale	870
Loans receivable net	409,411
Accrued interest receivable	2,002
Financial Liabilities
Demand (non-interest-bearing)	90,203
Demand (interest-bearing)	73,606
Money market	134,052
Savings and other	104,331
Certificates of deposit	90,679
Deposits	492,871
FHLBB advances	34,135
Repurchase agreements	2,980
Accrued interest payable	159
Fair Value Measurements Using, Level 1
Financial Assets
Cash and due from banks	31,441
Interest-bearing time deposits
Securities available-for-sale	488
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 Using, Level 2
Financial Assets
Cash and due from banks
Interest-bearing time deposits
Securities available-for-sale	106,122
Federal Home Loan Bank stock	5,340
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 Using, Level 3
Financial Assets
Cash and due from banks
Interest-bearing time deposits	4,233
Securities available-for-sale
Federal Home Loan Bank stock
Loans held-for-sale	870
Loans receivable net	409,411
Accrued interest receivable	2,002
Financial Liabilities
Demand (non-interest-bearing)	90,203
Demand (interest-bearing)	73,606
Money market	134,052
Savings and other	104,331
Certificates of deposit	90,679
Deposits	492,871
FHLBB advances	34,135
Repurchase agreements	2,980
Accrued interest payable	159
Assets at fair value
Financial Assets
Cash and due from banks		43,574
Interest-bearing time deposits
Securities available-for-sale		126,287
Federal Home Loan Bank stock		5,747
Loans held-for-sale		1,893
Loans receivable net		389,292
Accrued interest receivable		1,818
Financial Liabilities
Demand (non-interest-bearing)		98,850
Demand (interest-bearing)		65,991
Money market		128,501
Savings and other		103,985
Certificates of deposit		94,894
Deposits		492,221
FHLBB advances		35,363
Repurchase agreements		1,784
Accrued interest payable		196
Fair Value Measurements Using, Level 1
Financial Assets
Cash and due from banks		43,574
Interest-bearing time deposits
Securities available-for-sale		167
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 Using, Level 2
Financial Assets
Cash and due from banks
Interest-bearing time deposits
Securities available-for-sale		126,120
Federal Home Loan Bank stock		5,747
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 Using, Level 3
Financial Assets
Cash and due from banks
Interest-bearing time deposits
Securities available-for-sale
Federal Home Loan Bank stock
Loans held-for-sale		1,893
Loans receivable net		389,292
Accrued interest receivable		1,818
Financial Liabilities
Demand (non-interest-bearing)		98,850
Demand (interest-bearing)		65,991
Money market		128,501
Savings and other		103,985
Certificates of deposit		94,894
Deposits		492,221
FHLBB advances		35,363
Repurchase agreements		1,784
Accrued interest payable		$ 196

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SavingsAndOther

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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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-Name Accounting Standards Codification

-Glossary Cash Equivalents

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-Name Statement of Financial Accounting Standard (FAS)

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-Name Regulation S-X (SX)

-Number 210

-Section 02

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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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-Name Accounting Standards Codification

-Topic 942

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Amount of money in interest-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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Amount of interest-bearing domestic deposit liabilities for time deposit liabilities other than certificates of deposit.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid.

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-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

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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 in the same submission. This item represents the amount shown on an entity's books for investments in Federal Home Loan Bank stock.

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-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 20

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-Chapter 12

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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 in the same submission. This item represents loans held-for-sale as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date.

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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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-SubTopic 10

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-Subparagraph (SX 210.5-02.3)

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-Name Accounting Research Bulletin (ARB)

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-Section A

-Paragraph 4

-Chapter 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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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