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Investment Securities Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2014
security
state
Sep. 30, 2013
security
Dec. 31, 2013
security
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2012
Investments, Debt and Equity Securities [Abstract]            
Available-for-sale Securities Pledged as Collateral $ 181,441 $ 156,727 $ 147,074      
Number of securities temporarily impaired 76 297 304      
Number of securities temporarily impaired 47 7 32      
Length of time securities temporarily impaired 12 months 12 months 12 months      
Amortized cost of transferred securities from available-for-sale to held-to-maturity 89,780          
Fair value of transferred securities from available-for-sale to held-to-maturity 89,757          
Net unrealized loss, net of taxes on transferred securities 15          
Other comprehensive income (loss), unrealized loss on transferred securities 28 0 0 0 0 0
Number of states in New England where FHLB serve 6          
Federal Home Loan Bank Stock $ 12,875 $ 12,875 $ 12,875