Loans and allowance for loan losses (Details 5) - USD ($)
$ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
$ 11,252
|
$ 11,854
|
| Construction and Land Development Commercial [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
464
|
479
|
| Owner Occupied [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
4,232
|
4,342
|
| Non-Owner Occupied [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
2,176
|
2,236
|
| Consumer Real Estate [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
4,029
|
4,400
|
| First Deed of Trust [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
3,432
|
3,853
|
| Second Deed of Trust [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
597
|
547
|
| Commercial and industrial loans (except those secured by real estate) [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
351
|
397
|
| Commercial [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
464
|
479
|
| Commercial Real Estate [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
6,408
|
6,578
|
| Specific Valuation Allowance [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
88
|
234
|
| Specific Valuation Allowance [Member] | Construction and Land Development Commercial [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
2
|
9
|
| Specific Valuation Allowance [Member] | Owner Occupied [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
21
|
86
|
| Specific Valuation Allowance [Member] | Non-Owner Occupied [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
0
|
0
|
| Specific Valuation Allowance [Member] | Consumer Real Estate [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
65
|
139
|
| Specific Valuation Allowance [Member] | First Deed of Trust [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
60
|
139
|
| Specific Valuation Allowance [Member] | Second Deed of Trust [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
5
|
0
|
| Specific Valuation Allowance [Member] | Commercial and industrial loans (except those secured by real estate) [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
0
|
0
|
| Specific Valuation Allowance [Member] | Commercial [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
2
|
9
|
| Specific Valuation Allowance [Member] | Commercial Real Estate [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
21
|
86
|
| Performing Financing Receivable [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
10,170
|
10,391
|
| Performing Financing Receivable [Member] | Construction and Land Development Commercial [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
464
|
479
|
| Performing Financing Receivable [Member] | Owner Occupied [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
4,037
|
4,117
|
| Performing Financing Receivable [Member] | Non-Owner Occupied [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
2,176
|
2,236
|
| Performing Financing Receivable [Member] | Consumer Real Estate [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
3,263
|
3,559
|
| Performing Financing Receivable [Member] | First Deed of Trust [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
2,733
|
3,012
|
| Performing Financing Receivable [Member] | Second Deed of Trust [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
530
|
547
|
| Performing Financing Receivable [Member] | Commercial and industrial loans (except those secured by real estate) [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
230
|
0
|
| Performing Financing Receivable [Member] | Commercial [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
464
|
479
|
| Performing Financing Receivable [Member] | Commercial Real Estate [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
6,213
|
6,353
|
| Nonperforming Financing Receivable [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
1,082
|
1,463
|
| Nonperforming Financing Receivable [Member] | Construction and Land Development Commercial [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
0
|
0
|
| Nonperforming Financing Receivable [Member] | Owner Occupied [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
195
|
225
|
| Nonperforming Financing Receivable [Member] | Non-Owner Occupied [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
0
|
0
|
| Nonperforming Financing Receivable [Member] | Consumer Real Estate [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
766
|
841
|
| Nonperforming Financing Receivable [Member] | First Deed of Trust [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
699
|
841
|
| Nonperforming Financing Receivable [Member] | Second Deed of Trust [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
67
|
0
|
| Nonperforming Financing Receivable [Member] | Commercial and industrial loans (except those secured by real estate) [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
121
|
397
|
| Nonperforming Financing Receivable [Member] | Commercial [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
0
|
0
|
| Nonperforming Financing Receivable [Member] | Commercial Real Estate [Member] |
|
|
| Information concerning Troubled Debt Restructurings [Abstract] |
|
|
| Recorded Investment |
$ 195
|
$ 225
|