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Investment Securities - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
security
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
security
segment
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale securities, gross realized gains (losses) $ 0 $ 0 $ 0 $ 0  
OTTI losses, investments 0 0 $ 0 0  
Number of general segments for the segregation of portfolio | segment     2    
Unrealized gain (loss) on marketable equity securities 0 $ 71,000 $ (60,000) $ 85,000  
Held-to-maturity securities 0   0   $ 0
Investment securities $ 0   $ 0   0
Municipal bonds          
Debt Securities, Available-for-sale [Line Items]          
Number of impaired securities | security 25   25    
U.S. Government agencies          
Debt Securities, Available-for-sale [Line Items]          
Number of impaired securities | security 6   6    
U.S. Government sponsored entities & agencies collateralized by mortgage obligations          
Debt Securities, Available-for-sale [Line Items]          
Number of impaired securities | security 9   9    
Carrying Amount          
Debt Securities, Available-for-sale [Line Items]          
Fair value of available-for-sale securities pledged as collateral for FHLB borrowings $ 105,071,000   $ 105,071,000    
Investment securities 147,340,000   147,340,000   86,192,000
Estimated Fair Value          
Debt Securities, Available-for-sale [Line Items]          
Fair value of available-for-sale securities pledged as collateral for FHLB borrowings 105,782,000   105,782,000    
Investment securities $ 147,340,000   $ 147,340,000   $ 86,192,000