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Securities - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Security
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]        
Gross gains on sales of securities available for sale | $ $ 31 $ 44    
Carrying value of securities pledged as collateral as required by law on public and trust deposits, repurchase agreements, and for other purposes | $     $ 174,308 $ 165,792
U.S. Government and agencies        
Debt Securities, Available-for-sale [Line Items]        
Available for sale securities in unrealized loss positions for 12 months or more     31  
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed)     1.00%  
Schedule of Held-to-maturity Securities [Line Items]        
Held to maturity securities in unrealized loss positions for 12 months or more     2  
Held to maturity securities in unrealized loss positions, percentage of amortized cost (individually did not exceed)     1.00%  
Mortgage-backed securities, residential        
Debt Securities, Available-for-sale [Line Items]        
Available for sale securities in unrealized loss positions for 12 months or more     2  
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed)     2.00%  
Available for sale securities in unrealized loss positions     6  
Schedule of Held-to-maturity Securities [Line Items]        
Held to maturity securities in unrealized loss positions for 12 months or more     8  
Held to maturity securities in unrealized loss positions, percentage of amortized cost (individually did not exceed)     1.00%  
Held to maturity securities in unrealized loss positions     11  
State and municipal        
Debt Securities, Available-for-sale [Line Items]        
Available for sale securities in unrealized loss positions for 12 months or more     3  
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed)     1.00%