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Securities - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Security
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Security
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Gross gains on sales of securities available for sale | $ $ 0 $ 12,500 $ 0 $ 12,500  
Carrying value of securities pledged as collateral as required by law on public and trust deposits, repurchase agreements, and for other purposes | $ $ 138,082,000   $ 138,082,000   $ 165,792,000
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 34   34    
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) 2.00%   2.00%    
Schedule of Held-to-maturity Securities [Line Items]          
Held to maturity securities in unrealized loss positions for 12 months or more 4   4    
Held to maturity securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) 1.00%   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 5   5    
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) 1.00%   1.00%    
Schedule of Held-to-maturity Securities [Line Items]          
Held to maturity securities in unrealized loss positions for 12 months or more 14   14    
Held to maturity securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) 1.00%   1.00%    
State and municipal          
Debt Securities, Available-for-sale [Line Items]          
Available for sale securities in unrealized loss positions for 12 months or more 5   5    
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) 1.00%   1.00%