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Loans and allowance for loan losses (Details 8) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance $ 3,419 $ 3,523 $ 3,562 $ 5,496 $ 5,567 $ 5,729
Allowance Individually Evaluated for Impairment 380   851      
Allowance Collectively Evaluated for Impairment 3,039   2,711      
Loans Ending Balance 333,536   306,771      
Loans Individually Evaluated for Impairment 16,057   20,509      
Loans Collectively Evaluated for Impairment 317,479   286,262      
Residential [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 43 31 30 83 92 34
Allowance Individually Evaluated for Impairment 0   0      
Allowance Collectively Evaluated for Impairment 43   30      
Allowance Loans acquired with Deteriorated Credit Quality 7,166   5,202      
Loans Ending Balance 0   0      
Loans Individually Evaluated for Impairment 7,166   5,202      
Commercial [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 276 259 291 415 369 202
Allowance Individually Evaluated for Impairment 11   2      
Allowance Collectively Evaluated for Impairment 265   289      
Allowance Loans acquired with Deteriorated Credit Quality 24,834   25,948      
Loans Ending Balance 552   1,822      
Loans Individually Evaluated for Impairment 24,282   24,126      
Commercial Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 1,236 1,204 1,695 2,452 2,562 2,651
Allowance Individually Evaluated for Impairment 102   409      
Allowance Collectively Evaluated for Impairment 1,134   1,286      
Loans Ending Balance 129,912   116,218      
Loans Individually Evaluated for Impairment 7,610   9,652      
Loans Collectively Evaluated for Impairment 122,302   106,566      
Home equity lines [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 264 $ 259 448 $ 487 $ 441 $ 469
Allowance Individually Evaluated for Impairment 0   0      
Allowance Collectively Evaluated for Impairment 264   448      
Allowance Loans acquired with Deteriorated Credit Quality 20,460   20,333      
Loans Ending Balance 20,460   20,333      
Loans Individually Evaluated for Impairment 19,455   19,095      
Construction and Land Development [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 319   321      
Allowance Individually Evaluated for Impairment 11   2      
Allowance Collectively Evaluated for Impairment 308   319      
Loans Ending Balance 32,000   31,150      
Loans Individually Evaluated for Impairment 552   1,822      
Loans Collectively Evaluated for Impairment 31,448   29,328      
Owner Occupied [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 637   1,167      
Allowance Individually Evaluated for Impairment 102   383      
Allowance Collectively Evaluated for Impairment 535   784      
Allowance Loans acquired with Deteriorated Credit Quality 68,305   69,256      
Loans Ending Balance 5,061   6,785      
Loans Individually Evaluated for Impairment 63,244   62,471      
Non-Owner Occupied [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 540   460      
Allowance Individually Evaluated for Impairment 0   26      
Allowance Collectively Evaluated for Impairment 540   434      
Allowance Loans acquired with Deteriorated Credit Quality 52,598   38,037      
Loans Ending Balance 2,549   2,867      
Loans Individually Evaluated for Impairment 50,049   35,170      
Multifamily [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 56   51      
Allowance Individually Evaluated for Impairment 0   0      
Allowance Collectively Evaluated for Impairment 56   51      
Allowance Loans acquired with Deteriorated Credit Quality 8,721   8,537      
Loans Ending Balance 0   0      
Loans Individually Evaluated for Impairment 8,721   8,537      
Farmland [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 3   17      
Allowance Individually Evaluated for Impairment 0   0      
Allowance Collectively Evaluated for Impairment 3   17      
Allowance Loans acquired with Deteriorated Credit Quality 288   388      
Loans Ending Balance 0   0      
Loans Individually Evaluated for Impairment 288   388      
First Deed of Trust [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 462   602      
Allowance Individually Evaluated for Impairment 168   324      
Allowance Collectively Evaluated for Impairment 294   278      
Allowance Loans acquired with Deteriorated Credit Quality 53,737   56,776      
Loans Ending Balance 5,661   5,759      
Loans Individually Evaluated for Impairment 48,076   51,017      
Second Deed of Trust [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 128   111      
Allowance Individually Evaluated for Impairment 92   98      
Allowance Collectively Evaluated for Impairment 36   13      
Allowance Loans acquired with Deteriorated Credit Quality 5,753   6,485      
Loans Ending Balance 747   1,212      
Loans Individually Evaluated for Impairment 5,006   5,273      
Consumer Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 854   1,161      
Allowance Individually Evaluated for Impairment 260   422      
Allowance Collectively Evaluated for Impairment 594   739      
Loans Ending Balance 79,950   83,594      
Loans Individually Evaluated for Impairment 7,413   8,209      
Loans Collectively Evaluated for Impairment 72,537   75,385      
Commercial and industrial loans (except those secured by real estate) [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 211   94      
Allowance Individually Evaluated for Impairment 7   18      
Allowance Collectively Evaluated for Impairment 204   76      
Allowance Loans acquired with Deteriorated Credit Quality 37,773   20,086      
Loans Ending Balance 482   826      
Loans Individually Evaluated for Impairment 37,291   19,260      
Guaranteed student loans [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 188   230      
Allowance Individually Evaluated for Impairment 0   0      
Allowance Collectively Evaluated for Impairment 188   230      
Allowance Loans acquired with Deteriorated Credit Quality     53,989      
Loans Ending Balance 0   0      
Loans Individually Evaluated for Impairment 51,381          
Loans Collectively Evaluated for Impairment 51,381   53,989      
Consumer And Other [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance Ending Balance 611   61      
Allowance Individually Evaluated for Impairment 0   0      
Allowance Collectively Evaluated for Impairment 611   61      
Allowance Loans acquired with Deteriorated Credit Quality 2,520   1,734      
Loans Ending Balance 0   0      
Loans Individually Evaluated for Impairment $ 2,520   $ 1,734