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Investment Securities - Textual (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
security
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
security
Schedule of Available-for-sale Securities        
Unrealized gain (loss) on available for sale portfolio $ 4,012,000 $ (891,000)    
Tax liabilities (benefits) associated with available-for-sale portfolio 1,186,000 (375,000)    
Transfer of securities from available-for-sale to held-to-maturity       $ 31,000,000
HTM transfers to AFS securities, fair value 0 23,100,000    
Transfers to held-to-maturity, fair value       32,000,000
Unrealized gain (loss) on transfer of securities from available-for-sale to held-to-maturity       $ 163,000
HTM, number of securities sold | security       5
Number of securities sold | security       13
Book Value of HTM securities sold   8,500,000    
Gross realized gains from sales or calls 0 696,000 $ 14,000  
Remaining unaccreted balance of HTM securities   0    
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to 1,178,000 $ 515,000 615,000  
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 0 136,000 $ 0  
Debt securities, amortized cost 538,692,000 548,640,000    
Available-for-sale investment securities, Amortized cost 538,692,000 548,640,000    
Available-for-sale Securities Pledged as Collateral 90,541,000 88,903,000    
Securities Pledged as Collateral        
Schedule of Available-for-sale Securities        
Available-for-sale investment securities, Amortized cost $ 88,930,000 86,418,000    
U.S. Government agencies        
Schedule of Available-for-sale Securities        
Available-for-sale Securities, Number of Positions | security 22      
Debt securities, amortized cost $ 65,994,000 69,005,000    
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 2      
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 Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities $ 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 91      
Debt securities, amortized cost $ 136,955,000 288,543,000    
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 1      
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 1      
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 150      
Debt securities, amortized cost $ 237,210,000 181,785,000    
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 42      
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 27      
Private label residential mortgage and asset backed securities        
Schedule of Available-for-sale Securities        
Unrealized gain (loss) on available for sale portfolio $ (352,000)      
Available-for-sale Securities, Number of Positions | security 30      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 17      
Debt securities, amortized cost $ 91,033,000 $ 1,807,000    
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 10      
Debt securities, amortized cost $ 1,359,000