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Investment Securities Additional Information (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
security
state
Sep. 30, 2014
USD ($)
security
Dec. 31, 2014
USD ($)
security
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Investments, Debt and Equity Securities [Abstract]            
Available-for-sale Securities Pledged as Collateral $ 221,072 $ 181,441 $ 164,919      
Number of securities temporarily impaired | security 88 76 56      
Number of securities temporarily impaired | security 14 47 36      
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 $ (99) (28) $ (48) $ (84) $ 0 $ 0
Number of states in New England where FHLB serve | state 6          
Federal Home Loan Bank Stock $ 12,875 $ 12,875 $ 12,875