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Investment Securities - Textual (Details)
 12 Months Ended
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Available-for-sale Securities      
Unrealized gain (loss) on available for sale portfolio $ (6,257,000) $ 4,089,000  
Tax liabilities (benefits) associated with available-for-sale portfolio (1,850,000) 1,186,000  
Gross realized gains from sales or calls 0 0 $ 696,000
Remaining unaccreted balance of HTM securities   0  
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to 388,000 $ 1,178,000 515,000
Threshold Period of Value Decline in Available-for-sale Securities to be considered Other than Temporary Impairment   12 months  
Threshold Percentage of Value Decline in Available-for-sale Securities to be considered Other than Temporary Impairment   10.00%  
Threshold Amount of Value Decline in Available-for-sale Securities to be considered Other than Temporary Impairment   $ 10,000  
Other than temporary impairment losses on investment securities 0 0 $ 136,000
Debt securities, amortized cost 470,162,000 531,192,000  
Available-for-sale investment securities, Amortized cost 470,162,000 531,192,000  
Securities pledged as collateral 79,662,000 90,541,000  
Securities Pledged as Collateral      
Schedule of Available-for-sale Securities      
Available-for-sale investment securities, Amortized cost $ 80,001,000 88,930,000  
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions | security 6    
Debt securities, amortized cost $ 21,723,000 65,994,000  
U.S. Government agencies | Less than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 4    
U.S. Government agencies | Greater than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 2    
Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest $ 136,000    
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Number of Impaired Securities | security 1    
Available-for-sale Securities, Other than Temporary Impaired Security $ 2,995,000    
Available-for-sale Debt Securities, Other than Temporary Impairment Security, Amortized Cost Basis $ 3,131,000    
Available-for-sale Securities, Number of Positions | security 52    
Debt securities, amortized cost $ 79,886,000 136,955,000  
Obligations of states and political subdivisions | Less than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 2    
Obligations of states and political subdivisions | Greater than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 8    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions | security 137    
Debt securities, amortized cost $ 239,388,000 237,210,000  
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Less than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 23    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Greater than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 60    
Private label residential mortgage and asset backed securities      
Schedule of Available-for-sale Securities      
Unrealized gain (loss) on available for sale portfolio $ (3,016,000)    
Available-for-sale Securities, Number of Positions | security 36    
Debt securities, amortized cost $ 129,165,000 $ 91,033,000  
Private label residential mortgage and asset backed securities | External Credit Rating, Non Investment Grade [Member]      
Schedule of Available-for-sale Securities      
Available-for-sale Securities, Number of Positions | security 8    
Debt securities, amortized cost $ 1,137,000    
Private label residential mortgage and asset backed securities | Less than 12 months      
Schedule of Available-for-sale Securities      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 7