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Investment Securities - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
security
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
segment
security
Sep. 30, 2018
USD ($)
Dec. 31, 2018
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 18,000 $ (35,000) $ 128,000 $ (114,000)  
Held-to-maturity securities 0   0   $ 0
Investment securities $ 0   $ 0   0
U.S. Government agencies          
Debt Securities, Available-for-sale [Line Items]          
Number of impaired securities | security 10   10    
U.S. Government sponsored entities & agencies collateralized by mortgage obligations          
Debt Securities, Available-for-sale [Line Items]          
Number of impaired securities | security 17   17    
Carrying Amount          
Debt Securities, Available-for-sale [Line Items]          
Fair value of available-for-sale securities pledged as collateral for FHLB borrowings $ 65,177,000   $ 65,177,000    
Investment securities 81,651,000   81,651,000   70,085,000
Estimated Fair Value          
Debt Securities, Available-for-sale [Line Items]          
Fair value of available-for-sale securities pledged as collateral for FHLB borrowings 65,030,000   65,030,000    
Investment securities $ 81,651,000   $ 81,651,000   $ 70,085,000