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Investment Securities Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
security
state
Mar. 31, 2015
USD ($)
security
Dec. 31, 2015
USD ($)
security
Sep. 30, 2014
USD ($)
Investments, Debt and Equity Securities [Abstract]        
Fair value of securities pledged as collateral $ 202,296 $ 224,133 $ 201,879  
Number of securities temporarily impaired (security) | security 34 55 78  
Number of securities temporarily impaired (security) | security 12 5 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
Other comprehensive income (loss), unrealized loss on transferred securities $ (123) $ (67) $ (112)  
Number of states in New England where FHLB serve (state) | state 6      
Federal Home Loan Bank Stock $ 12,838 $ 12,875 $ 13,220