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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Commitments to extend credit    
Commitments and Contingencies    
Commitments to extend credit $ 200,880 $ 214,131
Undisbursed lines of credit    
Commitments and Contingencies    
Commitments to extend credit 199,673 212,501
Undisbursed portions of construction loans    
Commitments and Contingencies    
Commitments to extend credit 24,505 15,977
Standby letters of credit and financial guarantees    
Commitments and Contingencies    
Commitments to extend credit $ 1,207 1,630
Minimum | Undisbursed lines of credit    
Commitments and Contingencies    
Commitments to extend credit, term of agreement 1 month  
Maximum | Undisbursed lines of credit    
Commitments and Contingencies    
Commitments to extend credit, term of agreement 12 months  
Maximum | Standby letters of credit and financial guarantees    
Commitments and Contingencies    
Commitments to extend credit, term of agreement 1 year  
Probable loan loss experience on unfunded obligations [Member]    
Commitments and Contingencies    
Loss Contingency, Estimate of Possible Loss $ 195 $ 165