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Investment Securities Additional Information (Details)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
security
state
Jun. 30, 2014
USD ($)
security
Dec. 31, 2014
USD ($)
security
Mar. 31, 2015
USD ($)
Sep. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Investments, Debt and Equity Securities [Abstract]              
Available-for-sale Securities Pledged as Collateral $ 194,337 $ 131,869 $ 164,919        
Number of securities temporarily impaired | security 295 197 56        
Number of securities temporarily impaired | security 14 175 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 $ (84) $ 0 $ (48) $ (67)   $ 0 $ 0
Number of states in New England where FHLB serve | state 6            
Federal Home Loan Bank Stock $ 12,875 $ 12,875 $ 12,875