Loans and allowance for loan losses (Details 8) - USD ($)
$ in Thousands |
Sep. 30, 2017 |
Jun. 30, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Dec. 31, 2015 |
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
$ 3,243
|
$ 3,267
|
$ 3,373
|
$ 3,419
|
$ 3,523
|
$ 3,562
|
| Allowance Individually Evaluated for Impairment |
327
|
|
335
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
2,916
|
|
3,038
|
|
|
|
| Loans Ending Balance |
347,002
|
|
337,100
|
|
|
|
| Loans Individually Evaluated for Impairment |
15,574
|
|
15,441
|
|
|
|
| Loans Collectively Evaluated for Impairment |
331,428
|
|
321,659
|
|
|
|
| Residential [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
38
|
38
|
41
|
43
|
31
|
30
|
| Allowance Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
38
|
|
41
|
|
|
|
| Loans Ending Balance |
6,327
|
|
6,770
|
|
|
|
| Loans Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Loans Collectively Evaluated for Impairment |
6,327
|
|
6,770
|
|
|
|
| Commercial [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
175
|
213
|
300
|
276
|
259
|
291
|
| Allowance Individually Evaluated for Impairment |
2
|
|
9
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
173
|
|
291
|
|
|
|
| Loans Ending Balance |
28,721
|
|
27,092
|
|
|
|
| Loans Individually Evaluated for Impairment |
561
|
|
581
|
|
|
|
| Loans Collectively Evaluated for Impairment |
28,160
|
|
26,511
|
|
|
|
| Commercial Real Estate [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
1,000
|
974
|
1,076
|
1,236
|
1,204
|
1,695
|
| Allowance Individually Evaluated for Impairment |
21
|
|
86
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
979
|
|
990
|
|
|
|
| Loans Ending Balance |
140,057
|
|
133,099
|
|
|
|
| Loans Individually Evaluated for Impairment |
7,610
|
|
7,840
|
|
|
|
| Loans Collectively Evaluated for Impairment |
132,447
|
|
125,259
|
|
|
|
| Home equity lines [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
247
|
$ 250
|
271
|
$ 264
|
$ 259
|
$ 448
|
| Allowance Individually Evaluated for Impairment |
4
|
|
0
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
243
|
|
271
|
|
|
|
| Loans Ending Balance |
20,595
|
|
20,691
|
|
|
|
| Loans Individually Evaluated for Impairment |
739
|
|
703
|
|
|
|
| Loans Collectively Evaluated for Impairment |
19,856
|
|
19,988
|
|
|
|
| Construction and Land Development Commercial [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
213
|
|
341
|
|
|
|
| Allowance Individually Evaluated for Impairment |
2
|
|
9
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
211
|
|
332
|
|
|
|
| Loans Ending Balance |
35,048
|
|
33,862
|
|
|
|
| Loans Individually Evaluated for Impairment |
561
|
|
581
|
|
|
|
| Loans Collectively Evaluated for Impairment |
34,487
|
|
33,281
|
|
|
|
| Owner Occupied [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
524
|
|
611
|
|
|
|
| Allowance Individually Evaluated for Impairment |
21
|
|
86
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
503
|
|
525
|
|
|
|
| Loans Ending Balance |
71,834
|
|
66,021
|
|
|
|
| Loans Individually Evaluated for Impairment |
5,434
|
|
5,604
|
|
|
|
| Loans Collectively Evaluated for Impairment |
66,400
|
|
60,417
|
|
|
|
| Non-Owner Occupied [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
434
|
|
406
|
|
|
|
| Allowance Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
434
|
|
406
|
|
|
|
| Loans Ending Balance |
61,831
|
|
57,944
|
|
|
|
| Loans Individually Evaluated for Impairment |
2,176
|
|
2,236
|
|
|
|
| Loans Collectively Evaluated for Impairment |
59,655
|
|
55,708
|
|
|
|
| Multifamily [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
39
|
|
56
|
|
|
|
| Allowance Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
39
|
|
56
|
|
|
|
| Loans Ending Balance |
6,114
|
|
8,824
|
|
|
|
| Loans Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Loans Collectively Evaluated for Impairment |
6,114
|
|
8,824
|
|
|
|
| Farmland [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
3
|
|
3
|
|
|
|
| Allowance Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
3
|
|
3
|
|
|
|
| Loans Ending Balance |
278
|
|
310
|
|
|
|
| Loans Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Loans Collectively Evaluated for Impairment |
278
|
|
310
|
|
|
|
| First Deed of Trust [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
459
|
|
447
|
|
|
|
| Allowance Individually Evaluated for Impairment |
62
|
|
144
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
397
|
|
303
|
|
|
|
| Loans Ending Balance |
54,820
|
|
54,791
|
|
|
|
| Loans Individually Evaluated for Impairment |
4,733
|
|
5,064
|
|
|
|
| Loans Collectively Evaluated for Impairment |
50,087
|
|
49,727
|
|
|
|
| Second Deed of Trust [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
45
|
|
136
|
|
|
|
| Allowance Individually Evaluated for Impairment |
5
|
|
90
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
40
|
|
46
|
|
|
|
| Loans Ending Balance |
6,293
|
|
5,768
|
|
|
|
| Loans Individually Evaluated for Impairment |
680
|
|
709
|
|
|
|
| Loans Collectively Evaluated for Impairment |
5,613
|
|
5,059
|
|
|
|
| Consumer Real Estate [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
751
|
|
854
|
|
|
|
| Allowance Individually Evaluated for Impairment |
71
|
|
234
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
680
|
|
620
|
|
|
|
| Loans Ending Balance |
81,708
|
|
81,250
|
|
|
|
| Loans Individually Evaluated for Impairment |
6,152
|
|
6,476
|
|
|
|
| Loans Collectively Evaluated for Impairment |
75,556
|
|
74,774
|
|
|
|
| Commercial and industrial loans (except those secured by real estate) [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
445
|
|
223
|
|
|
|
| Allowance Individually Evaluated for Impairment |
233
|
|
6
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
212
|
|
217
|
|
|
|
| Loans Ending Balance |
40,647
|
|
39,390
|
|
|
|
| Loans Individually Evaluated for Impairment |
1,248
|
|
544
|
|
|
|
| Loans Collectively Evaluated for Impairment |
39,399
|
|
38,846
|
|
|
|
| Guaranteed student loans [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
99
|
|
158
|
|
|
|
| Allowance Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
99
|
|
158
|
|
|
|
| Loans Ending Balance |
47,643
|
|
47,398
|
|
|
|
| Loans Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Loans Collectively Evaluated for Impairment |
47,643
|
|
47,398
|
|
|
|
| Consumer And Other [Member] |
|
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
|
| Allowance Ending Balance |
735
|
|
721
|
|
|
|
| Allowance Individually Evaluated for Impairment |
0
|
|
0
|
|
|
|
| Allowance Collectively Evaluated for Impairment |
735
|
|
721
|
|
|
|
| Loans Ending Balance |
1,899
|
|
2,101
|
|
|
|
| Loans Individually Evaluated for Impairment |
3
|
|
0
|
|
|
|
| Loans Collectively Evaluated for Impairment |
$ 1,896
|
|
$ 2,101
|
|
|
|