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Investment Securities (Narrative) (Details) (USD $)	3 Months Ended
Investment Securities (Narrative) (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Investment Securities [Abstract]
Book value of securities pledged	$ 295,440,000		$ 349,520,000
Investment in FHLBB stock	7,496,000		8,145,000
Dividend income on investment in federal home loan bank stock	$ 5,000	$ 17,000

The carrying amount as of the date of the latest financial statement presented of other securities classified as available for sale or held for investment which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee does not have the right by contract or custom to sell or re-pledge them to an unrelated party.

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