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Troubled Debt Restructurings (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Investment
Dec. 31, 2016
USD ($)
Investment
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification    
Renewals deemed a concession 6 2
Reduced or deferred payments 2
Converted to interest only
Maturity date extensions
Total number of loans 8 2
Pre-modification outstanding recorded investment | $ $ 2,465 $ 665
Post-modification outstanding recorded investment | $ $ 2,612 $ 666
Commercial [Member] | Owner occupied RE [Member]    
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification    
Renewals deemed a concession 1 1
Reduced or deferred payments
Converted to interest only
Maturity date extensions
Total number of loans 1 1
Pre-modification outstanding recorded investment | $ $ 254 $ 477
Post-modification outstanding recorded investment | $ $ 310 $ 478
Commercial [Member] | Non-owner occupied RE [Member]    
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification    
Renewals deemed a concession 1  
Reduced or deferred payments  
Converted to interest only  
Maturity date extensions  
Total number of loans 1  
Pre-modification outstanding recorded investment | $ $ 976  
Post-modification outstanding recorded investment | $ $ 976  
Commercial [Member] | Business [Member]    
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification    
Renewals deemed a concession 2  
Reduced or deferred payments 1  
Converted to interest only  
Maturity date extensions  
Total number of loans 3  
Pre-modification outstanding recorded investment | $ $ 591  
Post-modification outstanding recorded investment | $ $ 600  
Consumer [Member] | Real estate [Member]    
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification    
Renewals deemed a concession 1 1
Reduced or deferred payments
Converted to interest only
Maturity date extensions
Total number of loans 1 1
Pre-modification outstanding recorded investment | $ $ 281 $ 188
Post-modification outstanding recorded investment | $ $ 270 $ 188
Consumer [Member] | Home equity [Member]    
Summary of concession at the time of modification and the recorded investment in TDRs before and after their modification    
Renewals deemed a concession 1  
Reduced or deferred payments 1  
Converted to interest only  
Maturity date extensions  
Total number of loans 2  
Pre-modification outstanding recorded investment | $ $ 363  
Post-modification outstanding recorded investment | $ $ 456