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Loans and allowance for loan losses (Details 6)
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Loans
Sep. 30, 2015
USD ($)
Loans
Defaults on TDRs [Line Items]    
Number of Loans | Loans 12 14
Recorded Balance | $ $ 1,271 $ 1,204
Commercial Loan [Member]    
Defaults on TDRs [Line Items]    
Number of Loans | Loans 0 1
Recorded Balance | $ $ 0 $ 19
Commercial Real Estate [Member]    
Defaults on TDRs [Line Items]    
Number of Loans | Loans 2 1
Recorded Balance | $ $ 390 $ 157
Owner Occupied [Member]    
Defaults on TDRs [Line Items]    
Number of Loans | Loans 2 1
Recorded Balance | $ $ 390 $ 157
Consumer Real Estate [Member]    
Defaults on TDRs [Line Items]    
Number of Loans | Loans 9 11
Recorded Balance | $ $ 778 $ 897
First Deed of Trust [Member]    
Defaults on TDRs [Line Items]    
Number of Loans | Loans 7 11
Recorded Balance | $ $ 692 $ 897
Second Deed of Trust [Member]    
Defaults on TDRs [Line Items]    
Number of Loans | Loans 2 0
Recorded Balance | $ $ 86 $ 0
Commercial and industrial loans (except those secured by real estate) [Member]    
Defaults on TDRs [Line Items]    
Number of Loans | Loans 1 1
Recorded Balance | $ $ 103 $ 131
Construction and Land Development [Member]    
Defaults on TDRs [Line Items]    
Number of Loans | Loans 0 1
Recorded Balance | $ $ 0 $ 19
Non-Owner Occupied [Member]    
Defaults on TDRs [Line Items]    
Number of Loans | Loans 0 0
Recorded Balance | $ $ 0 $ 0