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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies    
Federal reserve deposit requirement reserve amount $ 13,823  
Uninsured deposits $ 306  
% of Total Loans 100.00% 100.00%
Probable loan loss experience on unfunded obligations    
Commitments and Contingencies    
Loss Contingency, Estimate of Possible Loss $ 326 $ 125
Undisbursed lines of credit    
Commitments and Contingencies    
Commitments to extend credit 347,001 257,557
Standby letters of credit and financial guarantees    
Commitments and Contingencies    
Commitments to extend credit $ 3,140 $ 1,858
Commercial    
Commitments and Contingencies    
Percentage of loan commitments 50.00%  
% of Total Loans 12.90% 15.10%
Real Estate    
Commitments and Contingencies    
Percentage of loan commitments 39.00%  
Maximum loan to value ratio 80.00%  
Consumer    
Commitments and Contingencies    
Percentage of loan commitments 10.00%  
Real estate related    
Commitments and Contingencies    
% of Total Loans 83.70% 81.40%
Commercial and Real estate related    
Commitments and Contingencies    
% of Total Loans 96.60% 96.50%