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Investment Securities - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Security
Sep. 30, 2020
Security
Sep. 30, 2021
USD ($)
Security
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Number of available-for-sale securities in unrealized loss position less than 12 months | Security 23   23    
Number of available-for-sale securities in unrealized loss position 12 months or greater | Security 2   2    
Gain on sale of available for sale securities | $     $ 0 $ 20,000  
Sales of available-for-sale securities, book value | $       $ 1,700,000  
Sales of available-for-sale securities | Security 0 0 0    
Carrying value of available-for-sale securities pledged to secure public deposits | $ $ 44,071,000   $ 44,071,000   $ 24,005,000
Collateral Pledged          
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Carrying value of available-for-sale securities pledged to secure public deposits | $ $ 1,500,000   $ 1,500,000   2,300,000
Government Agency Securities          
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Number of available-for-sale securities in unrealized loss position less than 12 months | Security 2   2    
U.S. Treasury Strip Bonds          
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Number of available-for-sale securities in unrealized loss position less than 12 months | Security 1   1    
Carrying value of available-for-sale securities pledged to secure public deposits | $ $ 4,083,000   $ 4,083,000    
Government Agency Mortgage-Backed Securities          
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Number of available-for-sale securities in unrealized loss position less than 12 months | Security 12   12    
Carrying value of available-for-sale securities pledged to secure public deposits | $ $ 20,335,000   $ 20,335,000   9,532,000
Municipal Securities - Tax Exempt          
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Number of available-for-sale securities in unrealized loss position less than 12 months | Security 2   2    
Carrying value of available-for-sale securities pledged to secure public deposits | $ $ 533,000   $ 533,000    
Corporate Securities          
Schedule Of Available For Sale And Held To Maturity Securities [Line Items]          
Number of available-for-sale securities in unrealized loss position less than 12 months | Security 8   8    
Carrying value of available-for-sale securities pledged to secure public deposits | $ $ 6,625,000   $ 6,625,000   $ 2,614,000