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Investment Securities - Narrative (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
security
state
Sep. 30, 2020
USD ($)
security
Dec. 31, 2020
USD ($)
security
Jun. 30, 2020
security
Sep. 30, 2014
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Number of securities temporarily impaired (security) | security 184 75 50    
Number of securities temporarily impaired for twelve months or more (security) | security 19 10 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 transferred $ 99,000 $ 139,000 $ 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) | security       28  
Proceeds from sales of municipal securities 8,600,000        
Cumulative book value 8,332,000        
Net realized gain from sale of municipal securities 268,000        
Other equity securities          
Debt Securities, Available-for-sale [Line Items]          
Securities pledged as collateral $ 349,978,000 $ 285,253,000 $ 297,326,000