Investment Securities Held-to-Maturity (Details Textual) (USD $)	Sep. 30, 2012 Security	Dec. 31, 2011 Security
Securities Held to Maturity (Additional Textual) [Abstract]
Weighted average remaining life of investment securities held-to-maturity	3 years 6 months
Number of securities temporarily impaired for less than 12 months	3	2
Number of securities temporarily impaired for 12 months or longer	1	0
Number of securities temporarily impaired, total	98	92
Federal Home Loan Bank of Boston [Member]
Securities Held-to-Maturity (Textual) [Abstract]
Securities pledged for borrowing at the Federal Home Loan Bank of Boston amounting	111,707,000	49,345,000
U.S. Government Sponsored Enterprises [Member]
Securities Held-to-Maturity (Textual) [Abstract]
Weighted average remaining life	7,745,000
U.S. Government Agency and Sponsored Mortgage Backed Securities [Member]
Securities Held-to-Maturity (Textual) [Abstract]
Securities at fair value pledged to secure public deposits and repurchase agreements	158,319,000	8,885,000

- Definition

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 investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities more than one year from the balance sheet date or operating cycle, if longer; such investments are normally measured at amortized cost (carrying value) unless circumstances indicate that the value to be recovered from the investment is less than its carried amount. The held-to-maturity category is for those securities that the Company has the positive intent and ability to hold until maturity.

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