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Allowance for loan losses and credit quality Allocation of the Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment $ 83   $ 103      
Collectively evaluated for impairment 5,085   5,144      
Total allocated 5,168 $ 5,192 5,247 $ 5,226 $ 5,125 $ 5,201
Residential Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 59   63      
Collectively evaluated for impairment 1,328   1,336      
Total allocated 1,387 1,372 1,399 1,382 1,386 1,419
Construction Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 481   391      
Total allocated 481 442 391 373 466 514
Commercial Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 24   40      
Collectively evaluated for impairment 2,729   2,647      
Total allocated 2,753 2,661 2,687 2,837 2,729 2,792
Commercial [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 362   342      
Total allocated 362 346 342 240 218 209
Consumer [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 24   26      
Total allocated 24 24 26 27 25 28
Municipal [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 26   40      
Total allocated 26 42 40 26 47 38
Unallocated [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Individually evaluated for impairment 0   0      
Collectively evaluated for impairment 135   362      
Total allocated $ 135 $ 305 $ 362 $ 341 $ 254 $ 201