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Investment Securities - Additional Information (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
security
state
Mar. 31, 2019
USD ($)
security
Dec. 31, 2019
USD ($)
security
Sep. 30, 2014
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Number of securities temporarily impaired (security) | security 70 291 86  
Number of securities temporarily impaired for twelve months or more (security) | security 14 274 28  
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
Unamortized balance of net unrealized losses $ 174 $ 194 $ 182  
Number of states in New England where FHLB serve (state) | state 6      
FHLB stock investment $ 8,957 $ 7,945 7,945  
State and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Percentage of overall security holdings downgraded   0.09%    
Other equity securities        
Debt Securities, Available-for-sale [Line Items]        
Fair value of securities pledged as collateral $ 208,376 $ 189,711 $ 214,173