Loans and allowance for loan losses (Details 7) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
12 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
$ 3,523
|
$ 5,567
|
$ 3,562
|
$ 5,729
|
$ 5,729
|
| Provision for (Recovery of) Loan Losses |
0
|
0
|
0
|
0
|
(2,000)
|
| Charge-offs |
(224)
|
(141)
|
(466)
|
(784)
|
(816)
|
| Recoveries |
120
|
70
|
323
|
551
|
649
|
| Ending balance |
3,419
|
5,496
|
3,419
|
5,496
|
3,562
|
| Residential [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
31
|
92
|
30
|
34
|
34
|
| Provision for (Recovery of) Loan Losses |
12
|
(9)
|
12
|
48
|
(6)
|
| Charge-offs |
0
|
0
|
0
|
0
|
0
|
| Recoveries |
0
|
0
|
1
|
1
|
2
|
| Ending balance |
43
|
83
|
43
|
83
|
30
|
| Commercial [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
259
|
369
|
291
|
202
|
202
|
| Provision for (Recovery of) Loan Losses |
22
|
113
|
(10)
|
443
|
292
|
| Charge-offs |
(10)
|
(67)
|
(10)
|
(252)
|
(252)
|
| Recoveries |
5
|
0
|
5
|
22
|
49
|
| Ending balance |
276
|
415
|
276
|
415
|
291
|
| Commercial Real Estate [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
1,204
|
2,562
|
1,695
|
2,651
|
2,651
|
| Provision for (Recovery of) Loan Losses |
39
|
(145)
|
(571)
|
(109)
|
(866)
|
| Charge-offs |
(58)
|
0
|
(66)
|
(127)
|
(127)
|
| Recoveries |
51
|
35
|
178
|
37
|
37
|
| Ending balance |
1,236
|
2,452
|
1,236
|
2,452
|
1,695
|
| Home equity lines [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
259
|
441
|
448
|
469
|
469
|
| Provision for (Recovery of) Loan Losses |
4
|
59
|
(134)
|
70
|
36
|
| Charge-offs |
0
|
(14)
|
(53)
|
(54)
|
(62)
|
| Recoveries |
1
|
1
|
3
|
2
|
5
|
| Ending balance |
264
|
487
|
264
|
487
|
448
|
| Construction and Land Development [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
290
|
461
|
321
|
236
|
236
|
| Provision for (Recovery of) Loan Losses |
34
|
104
|
2
|
491
|
286
|
| Charge-offs |
(10)
|
(67)
|
(10)
|
(252)
|
(252)
|
| Recoveries |
5
|
0
|
6
|
23
|
51
|
| Ending balance |
319
|
498
|
319
|
498
|
321
|
| Owner Occupied [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
711
|
1,687
|
1,167
|
1,837
|
1,837
|
| Provision for (Recovery of) Loan Losses |
(17)
|
(151)
|
(464)
|
(173)
|
(576)
|
| Charge-offs |
(57)
|
0
|
(66)
|
(127)
|
(127)
|
| Recoveries |
0
|
33
|
0
|
33
|
33
|
| Ending balance |
637
|
1,569
|
637
|
1,569
|
1,167
|
| Non-Owner Occupied [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
437
|
639
|
460
|
607
|
607
|
| Provision for (Recovery of) Loan Losses |
53
|
51
|
27
|
81
|
(151)
|
| Charge-offs |
(1)
|
0
|
0
|
0
|
0
|
| Recoveries |
51
|
2
|
53
|
4
|
4
|
| Ending balance |
540
|
692
|
540
|
692
|
460
|
| Multifamily [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
54
|
109
|
51
|
77
|
77
|
| Provision for (Recovery of) Loan Losses |
2
|
3
|
5
|
34
|
(26)
|
| Charge-offs |
0
|
0
|
0
|
0
|
0
|
| Recoveries |
0
|
0
|
0
|
0
|
0
|
| Ending balance |
56
|
112
|
56
|
112
|
51
|
| Farmland [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
2
|
127
|
17
|
130
|
130
|
| Provision for (Recovery of) Loan Losses |
1
|
(48)
|
(139)
|
(51)
|
(113)
|
| Charge-offs |
0
|
0
|
0
|
0
|
0
|
| Recoveries |
0
|
0
|
125
|
0
|
0
|
| Ending balance |
3
|
79
|
3
|
79
|
17
|
| First Deed of Trust [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
490
|
1,192
|
602
|
1,345
|
1,345
|
| Provision for (Recovery of) Loan Losses |
79
|
72
|
(20)
|
(384)
|
(1,020)
|
| Charge-offs |
(113)
|
(37)
|
(140)
|
(103)
|
(103)
|
| Recoveries |
6
|
5
|
20
|
374
|
380
|
| Ending balance |
462
|
1,232
|
462
|
1,232
|
602
|
| Second Deed of Trust [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
133
|
250
|
111
|
275
|
275
|
| Provision for (Recovery of) Loan Losses |
(11)
|
(17)
|
23
|
0
|
(159)
|
| Charge-offs |
0
|
0
|
(25)
|
(55)
|
(55)
|
| Recoveries |
6
|
12
|
19
|
25
|
50
|
| Ending balance |
128
|
245
|
128
|
245
|
111
|
| Consumer Real Estate [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
882
|
1,883
|
1,161
|
2,089
|
2,089
|
| Provision for (Recovery of) Loan Losses |
72
|
114
|
(131)
|
(314)
|
(1,143)
|
| Charge-offs |
(113)
|
(51)
|
(218)
|
(212)
|
(220)
|
| Recoveries |
13
|
18
|
42
|
401
|
435
|
| Ending balance |
854
|
1,964
|
854
|
1,964
|
1,161
|
| Commercial and industrial loans (except those secured by real estate) [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
226
|
382
|
94
|
506
|
506
|
| Provision for (Recovery of) Loan Losses |
(46)
|
(67)
|
42
|
(87)
|
(350)
|
| Charge-offs |
(15)
|
0
|
(15)
|
(162)
|
(162)
|
| Recoveries |
46
|
15
|
90
|
73
|
100
|
| Ending balance |
211
|
330
|
211
|
330
|
94
|
| Guaranteed student loans [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
191
|
253
|
230
|
217
|
217
|
| Provision for (Recovery of) Loan Losses |
13
|
(21)
|
101
|
14
|
13
|
| Charge-offs |
(16)
|
(2)
|
(143)
|
(1)
|
0
|
| Recoveries |
0
|
0
|
0
|
0
|
0
|
| Ending balance |
188
|
230
|
188
|
230
|
230
|
| Consumer And Other [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
8
|
26
|
2
|
30
|
30
|
| Provision for (Recovery of) Loan Losses |
7
|
15
|
13
|
5
|
1
|
| Charge-offs |
(12)
|
(21)
|
(14)
|
(30)
|
(55)
|
| Recoveries |
5
|
2
|
7
|
17
|
26
|
| Ending balance |
8
|
$ 22
|
8
|
22
|
2
|
| Unallocated [Member] |
|
|
|
|
|
| Financing Receivable, Allowance for Credit Losses [Line Items] |
|
|
|
|
|
| Beginning balance |
722
|
|
59
|
$ 0
|
0
|
| Provision for (Recovery of) Loan Losses |
(119)
|
|
544
|
|
59
|
| Charge-offs |
0
|
|
0
|
|
0
|
| Recoveries |
0
|
|
0
|
|
0
|
| Ending balance |
$ 603
|
|
$ 603
|
|
$ 59
|