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Allowance for loan losses (Details 2) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance $ 3,373 $ 3,562 $ 5,729 $ 7,239
Allowance Individually Evaluated for Impairment 335 851 1,512  
Allowance Collectively Evaluated for Impairment 3,038 2,711 4,217  
Loans Ending Balance 337,100 306,771 286,146  
Loans Individually Evaluated for Impairment 15,441 20,509 32,280  
Loans Collectively Evaluated for Impairment 321,659 286,262 253,866  
Residential [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 41 30 34 135
Allowance Individually Evaluated for Impairment 0 0 0  
Allowance Collectively Evaluated for Impairment 41 30 34  
Loans Ending Balance 6,770 5,202 4,315  
Loans Individually Evaluated for Impairment 0 0 164  
Loans Collectively Evaluated for Impairment 6,770 5,202 4,151  
Commercial [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 300 291 202 1,274
Allowance Individually Evaluated for Impairment 9 2 26  
Allowance Collectively Evaluated for Impairment 291 289 176  
Loans Ending Balance 27,092 25,948 25,152  
Loans Individually Evaluated for Impairment 581 1,822 3,968  
Loans Collectively Evaluated for Impairment 26,511 24,126 21,184  
Commercial Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 1,076 1,695 2,651 2,226
Allowance Individually Evaluated for Impairment 86 409 905  
Allowance Collectively Evaluated for Impairment 990 1,286 1,746  
Loans Ending Balance 133,099 116,218 109,568  
Loans Individually Evaluated for Impairment 7,840 9,652 17,247  
Loans Collectively Evaluated for Impairment 125,259 106,566 92,321  
Home equity lines [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 271 448 469 $ 424
Allowance Individually Evaluated for Impairment 0 0 0  
Allowance Collectively Evaluated for Impairment 271 448 469  
Loans Ending Balance 20,691 20,333 20,082  
Loans Individually Evaluated for Impairment 703 1,238 800  
Loans Collectively Evaluated for Impairment 19,988 19,095 19,282  
Construction and Land Development [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 341 321 236  
Allowance Individually Evaluated for Impairment 9 2 26  
Allowance Collectively Evaluated for Impairment 332 319 210  
Loans Ending Balance 33,862 31,150 29,467  
Loans Individually Evaluated for Impairment 581 1,822 4,132  
Loans Collectively Evaluated for Impairment 33,281 29,328 25,335  
Owner Occupied [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 611 1,167 1,837  
Allowance Individually Evaluated for Impairment 86 383 905  
Allowance Collectively Evaluated for Impairment 525 784 932  
Loans Ending Balance 66,021 69,256 58,804  
Loans Individually Evaluated for Impairment 5,604 6,785 8,311  
Loans Collectively Evaluated for Impairment 60,417 62,471 50,493  
Non-Owner Occupied [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 406 460 607  
Allowance Individually Evaluated for Impairment 0 26 0  
Allowance Collectively Evaluated for Impairment 406 434 607  
Loans Ending Balance 57,944 38,037 38,892  
Loans Individually Evaluated for Impairment 2,236 2,867 6,593  
Loans Collectively Evaluated for Impairment 55,708 35,170 32,299  
Multifamily [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 56 51 77  
Allowance Individually Evaluated for Impairment 0 0 0  
Allowance Collectively Evaluated for Impairment 56 51 77  
Loans Ending Balance 8,824 8,537 11,438  
Loans Individually Evaluated for Impairment 0 0 2,322  
Loans Collectively Evaluated for Impairment 8,824 8,537 9,116  
Farmland [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 3 17 130  
Allowance Individually Evaluated for Impairment 0 0 0  
Allowance Collectively Evaluated for Impairment 3 17 130  
Loans Ending Balance 310 388 434  
Loans Individually Evaluated for Impairment 0 0 21  
Loans Collectively Evaluated for Impairment 310 388 413  
First Deed of Trust [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 447 602 1,345  
Allowance Individually Evaluated for Impairment 144 324 200  
Allowance Collectively Evaluated for Impairment 303 278 1,145  
Loans Ending Balance 54,791 56,776 61,837  
Loans Individually Evaluated for Impairment 5,064 5,759 7,900  
Loans Collectively Evaluated for Impairment 49,727 51,017 53,937  
Second Deed of Trust [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 136 111 275  
Allowance Individually Evaluated for Impairment 90 98 142  
Allowance Collectively Evaluated for Impairment 46 13 133  
Loans Ending Balance 5,768 6,485 7,854  
Loans Individually Evaluated for Impairment 709 1,212 1,360  
Loans Collectively Evaluated for Impairment 5,059 5,273 6,494  
Consumer Real Estate [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 854 1,161 2,089  
Allowance Individually Evaluated for Impairment 234 422 342  
Allowance Collectively Evaluated for Impairment 620 739 1,747  
Loans Ending Balance 81,250 83,594 89,773  
Loans Individually Evaluated for Impairment 6,476 8,209 10,060  
Loans Collectively Evaluated for Impairment 74,774 75,385 79,713  
Commercial and industrial loans (except those secured by real estate) [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 223 94 506  
Allowance Individually Evaluated for Impairment 6 18 239  
Allowance Collectively Evaluated for Impairment 217 76 267  
Loans Ending Balance 39,390 20,086 22,165  
Loans Individually Evaluated for Impairment 544 826 818  
Loans Collectively Evaluated for Impairment 38,846 19,260 21,347  
Guaranteed student loans [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 158 230 217  
Allowance Individually Evaluated for Impairment 0 0 0  
Allowance Collectively Evaluated for Impairment 158 230 217  
Loans Ending Balance 47,398 53,989 33,562  
Loans Individually Evaluated for Impairment 0 0 0  
Loans Collectively Evaluated for Impairment 47,398 53,989 33,562  
Consumer And Other [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Allowance Ending Balance 721 61 30  
Allowance Individually Evaluated for Impairment 0 0 0  
Allowance Collectively Evaluated for Impairment 721 61 30  
Loans Ending Balance 2,101 1,734 1,611  
Loans Individually Evaluated for Impairment 0 0 23  
Loans Collectively Evaluated for Impairment $ 2,101 $ 1,734 $ 1,588