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Allowance for loan losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 5,729 $ 7,239 $ 10,808
Provision for Loan and Lease Losses (2,000) 100 1,173
Charge-offs (816) (2,381) (5,659)
Recoveries 649 771 917
Ending balance 3,562 5,729 7,239
Residential [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 34 135 495
Provision for Loan and Lease Losses (6) (103) (462)
Charge-offs 0 0 0
Recoveries 2 2 102
Ending balance 30 34 135
Commercial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 202 1,274 4,611
Provision for Loan and Lease Losses 292 (1,016) (3,482)
Charge-offs (252) (100) (279)
Recoveries 49 44 424
Ending balance 291 202 1,274
Commercial Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,651 2,226 2,199
Provision for Loan and Lease Losses (866) 1,645 1,933
Charge-offs (127) (1,245) (1,969)
Recoveries 37 25 63
Ending balance 1,695 2,651 2,226
Home equity lines [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 469 424 658
Provision for Loan and Lease Losses 36 506 23
Charge-offs (62) (476) (266)
Recoveries 5 15 9
Ending balance 448 469 424
Construction and Land Development [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 236 1,409 5,106
Provision for Loan and Lease Losses 286 (1,119) (3,944)
Charge-offs (252) (100) (279)
Recoveries 51 46 526
Ending balance 321 236 1,409
Owner Occupied [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 1,837 1,200 1,359
Provision for Loan and Lease Losses (576) 1,268 252
Charge-offs (127) (631) (454)
Recoveries 33 0 43
Ending balance 1,167 1,837 1,200
Non-Owner Occupied [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 607 670 817
Provision for Loan and Lease Losses (151) 430 452
Charge-offs 0 (518) (619)
Recoveries 4 25 20
Ending balance 460 607 670
Multifamily [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 77 19 23
Provision for Loan and Lease Losses (26) 58 (4)
Charge-offs 0 0 0
Recoveries 0 0 0
Ending balance 51 77 19
Farmland [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 130 337 0
Provision for Loan and Lease Losses (113) (111) 1,233
Charge-offs 0 (96) (896)
Recoveries 0 0 0
Ending balance 17 130 337
First Deed of Trust [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 1,345 1,992 1,358
Provision for Loan and Lease Losses (1,020) (442) 2,493
Charge-offs (103) (277) (1,953)
Recoveries 380 72 94
Ending balance 602 1,345 1,992
Second Deed of Trust [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 275 394 224
Provision for Loan and Lease Losses (159) (223) 498
Charge-offs (55) (86) (367)
Recoveries 50 190 39
Ending balance 111 275 394
Commercial and industrial loans (except those secured by real estate) [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 506 724 1,162
Provision for Loan and Lease Losses (350) (447) 145
Charge-offs (162) (172) (760)
Recoveries 100 401 177
Ending balance 94 506 724
Guaranteed student loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 217 0  
Provision for Loan and Lease Losses 13 217  
Charge-offs 0 0  
Recoveries 0 0  
Ending balance 230 217 0
Consumer And Other [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 30 70 101
Provision for Loan and Lease Losses 60 (37) 25
Charge-offs (55) (25) (65)
Recoveries 26 22 9
Ending balance 61 30 70
Consumer Real Estate, Secured by 1-4 Family Residential [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,089 2,810 2,240
Provision for Loan and Lease Losses (1,143) (159) 3,014
Charge-offs (220) (839) (2,586)
Recoveries 435 277 142
Ending balance $ 1,161 $ 2,089 $ 2,810