FAIR VALUE OF ASSETS AND LIABILITIES - Carrying values and estimated fair values of financial instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Carrying value
Financial Assets
Cash and due from banks	$ 31,441	$ 43,574
Securities available-for-sale	118,664	126,287
Federal Home Loan Bank stock	5,340	5,747
Loans held-for-sale	710	1,879
Loans receivable net	406,258	388,758
Accrued interest receivable	2,021	1,818
Financial Liabilities
Demand (non-interest-bearing)	88,464	98,850
Demand (interest-bearing)	67,714	65,991
Money market	129,832	128,501
Savings and other	109,657	103,985
Certificates of deposit	92,106	93,888
Deposits	487,773	491,215
FHLBB advances	31,574	31,980
Repurchase agreements	2,329	1,784
Accrued interest payable	163	196
Estimated fair value
Financial Assets
Cash and due from banks	31,441	43,574
Securities available-for-sale	118,664	126,287
Federal Home Loan Bank stock	5,340	5,747
Loans held-for-sale	710	1,893
Loans receivable net	406,258	389,292
Accrued interest receivable	2,021	1,818
Financial Liabilities
Demand (non-interest-bearing)	88,464	98,850
Demand (interest-bearing)	67,714	65,991
Money market	129,832	128,501
Savings and other	109,657	103,985
Certificates of deposit	92,886	94,894
Deposits	488,553	492,221
FHLBB advances	35,203	35,363
Repurchase agreements	2,329	1,784
Accrued interest payable	163	196
Fair value measurements using, Level 1
Financial Assets
Cash and due from banks	31,441	43,574
Securities available-for-sale	311	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
Securities available-for-sale	118,353	126,120
Federal Home Loan Bank stock	5,340	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
Securities available-for-sale
Federal Home Loan Bank stock
Loans held-for-sale	710	1,893
Loans receivable net	406,258	389,292
Accrued interest receivable	2,021	1,818
Financial Liabilities
Demand (non-interest-bearing)	88,464	98,850
Demand (interest-bearing)	67,714	65,991
Money market	129,832	128,501
Savings and other	109,657	103,985
Certificates of deposit	92,886	94,894
Deposits	488,553	492,221
FHLBB advances	35,203	35,363
Repurchase agreements	2,329	1,784
Accrued interest payable	$ 163	$ 196

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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

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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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-Publisher SEC

-Name Regulation S-X (SX)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 8, 9

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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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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

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-Number AAG-DEP

-Paragraph 1, 2, 3, 7

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-Chapter 6

-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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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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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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.

+ References

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-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 20

-IssueDate 2006-05-01

-Chapter 12

-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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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 8, 9

-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 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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 9

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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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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph m

-Subparagraph 1

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-Publisher FASB

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-Topic 235

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