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Investment Securities Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
state
security
Mar. 31, 2012
security
Dec. 31, 2012
security
Investments, Debt and Equity Securities [Abstract]      
Available-for-sale Securities Pledged as Collateral $ 131,155 $ 136,156 $ 154,817
Number of securities temporarily impaired 116 42 42
Number of securities temporarily impaired 7 8 7
Length of time securities temporarily impaired 12 months 12 months 12 months
Number of states in New England where FHLB serve 6    
Federal Home Loan Bank Stock $ 12,875 $ 13,412 $ 13,412