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Investment Securities - Narrative (Details)
 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
state
security
Jun. 30, 2020
USD ($)
security
loan
Dec. 31, 2020
USD ($)
security
Sep. 30, 2014
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Number of securities temporarily impaired (security) | security 112 52 50  
Number of securities temporarily impaired for twelve months or more (security) | security 11 11 10  
Period of temporary impairment 12 months 12 months 12 months  
Amortized cost of securities transferred       $ 89,780,000
Fair value of securities transferred       89,757,000
Net unrealized loss, net of taxes on transferred securities       $ 15,000
Unamortized balance of net unrealized losses $ 113,000 $ 146,000 $ 133,000  
Number of states | state 6      
FHLB stock investment $ 7,802,000 $ 9,508,000 9,508,000  
Impairment losses 0      
   State and political subdivisions        
Debt Securities, Available-for-sale [Line Items]        
Number of securities temporarily impaired (security) | loan   28    
Proceeds from sales of municipal securities 8,600,000      
Cumulative book value 8,313,000      
Net realized gain from sale of municipal securities 268,000      
Other equity securities        
Debt Securities, Available-for-sale [Line Items]        
Securities pledged as collateral $ 291,913,000 $ 245,917,000 $ 297,326,000