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Investment Securities Additional Information (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
USD ($)
security
state
Jun. 30, 2015
USD ($)
security
Dec. 31, 2015
USD ($)
security
Sep. 30, 2014
USD ($)
Investments, Debt and Equity Securities [Abstract]        
Fair value of securities pledged as collateral $ 196,274 $ 194,337 $ 201,879  
Number of securities temporarily impaired (security) | security 25 295 78  
Number of securities temporarily impaired (security) | security 13 14 15  
Length of time securities temporarily impaired (months) 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
Unamortized balance of net unrealized losses $ 133 $ 84 $ 112  
Number of states in New England where FHLB serve (state) | state 6      
Federal Home Loan Bank Stock $ 13,404 $ 12,875 $ 13,220