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Investment Securities - Narrative (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
security
Dec. 31, 2020
USD ($)
loan
state
security
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Sep. 30, 2014
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Number of securities temporarily impaired (security) | security 86 50 86    
Number of securities temporarily impaired for 12 months or more (security) | security 28 10 28    
Period of temporary impairment   12 months 12 months    
Amortized cost of securities transferred   $ 24,900,000     $ 89,780,000
Net unrealized gains (losses) on securities transferred   1,600,000     (15,000)
Proceeds from sales of securities available for sale $ 4,300,000 103,579,000 $ 8,339,000 $ 459,000  
Gain on sale of securities 209,000 1,155,000 224,000    
Fair value of securities transferred         $ 89,757,000
Net unrealized loss on securities transferred from available for sale to held to maturity (182,000) $ (133,000) (182,000)    
Number of states | state   6      
Federal Home Loan Bank Stock 7,945,000 $ 9,508,000 7,945,000    
Impairment losses   $ 0      
State and political subdivisions          
Debt Securities, Available-for-sale [Line Items]          
Number of securities temporarily impaired (security) | loan   28      
Proceeds from sale of held-to-maturity 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 $ 214,173,000 $ 297,326,000 $ 214,173,000