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Allowance for loan losses and credit quality (Tables)
 9 Months Ended
Sep. 30, 2016
Loans and Leases Receivable, Allowance [Abstract]  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
Changes in the ALL, by class of loans, for the three and nine months ended September 30, 2016 and 2015 were as follows:
For The Three Months Ended September 30, 2016
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Balance, June 30, 2016
$
1,382

$
373

$
2,837

$
240

$
27

$
26

$
341

$
5,226

Provision (credit) for loan
  losses
11

28

(64
)
5

4

20

(4
)
—

Recoveries of amounts
  charged off
—

3

—

1

—

—

—

4

 
1,393

404

2,773

246

31

46

337

5,230

Amounts charged off
—

—

—

—

(4
)
—

—

(4
)
Balance, September 30, 2016
$
1,393

$
404

$
2,773

$
246

$
27

$
46

$
337

$
5,226

For The Three Months Ended September 30, 2015
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Balance, June 30, 2015
$
1,322

$
397

$
2,819

$
192

$
26

$
25

$
138

$
4,919

Provision (credit) for loan
  losses
62

84

(80
)
21

(1
)
24

40

150

Recoveries of amounts
  charged off
10

3

—

6

—

—

—

19

 
1,394

484

2,739

219

25

49

178

5,088

Amounts charged off
(28
)
—

—

(16
)
—

—

—

(44
)
Balance, September 30, 2015
$
1,366

$
484

$
2,739

$
203

$
25

$
49

$
178

$
5,044

For The Nine Months Ended September 30, 2016
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Balance, December 31, 2015
$
1,419

$
514

$
2,792

$
209

$
28

$
38

$
201

$
5,201

Provision (credit) for loan
  losses
79

(119
)
(19
)
62

3

8

136

150

Recoveries of amounts
  charged off
15

9

—

8

3

—

—

35

 
1,513

404

2,773

279

34

46

337

5,386

Amounts charged off
(120
)
—

—

(33
)
(7
)
—

—

(160
)
Balance, September 30, 2016
$
1,393

$
404

$
2,773

$
246

$
27

$
46

$
337

$
5,226

For The Nine Months Ended September 30, 2015
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Balance, December 31, 2014
$
1,330

$
439

$
2,417

$
176

$
27

$
42

$
263

$
4,694

Provision (credit) for loan
  losses
77

20

322

50

9

7

(85
)
400

Recoveries of amounts
  charged off
10

25

—

6

3

—

—

44

 
1,417

484

2,739

232

39

49

178

5,138

Amounts charged off
(51
)
—

—

(29
)
(14
)
—

—

(94
)
Balance, September 30, 2015
$
1,366

$
484

$
2,739

$
203

$
25

$
49

$
178

$
5,044
Allocation of Allowance for Loan Losses by Impairment Methodology [Table Text Block]
The allocation of the ALL, summarized on the basis of the Company's impairment methodology by class of loan, as of the balance sheet dates were as follows:
September 30, 2016
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
57

$
—

$
61

$
—

$
—

$
—

$
—

$
118

Collectively evaluated
   for impairment
1,336

404

2,712

246

27

46

337

5,108

Total allocated
$
1,393

$
404

$
2,773

$
246

$
27

$
46

$
337

$
5,226

December 31, 2015
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
109

$
—

$
227

$
21

$
—

$
—

$
—

$
357

Collectively evaluated
   for impairment
1,310

514

2,565

188

28

38

201

4,844

Total allocated
$
1,419

$
514

$
2,792

$
209

$
28

$
38

$
201

$
5,201
Allocation of Investment in Loans by Impairment Methodology [Table Text Block]
The recorded investment in loans, summarized on the basis of the Company's impairment methodology by class of loan, as of the balance sheet dates were as follows:
September 30, 2016
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
1,388

$
89

$
2,883

$
451

$
—

$
—

$
4,811

Collectively evaluated
   for impairment
165,214

35,442

242,759

32,433

3,914

37,788

517,550

Total
$
166,602

$
35,531

$
245,642

$
32,884

$
3,914

$
37,788

$
522,361

December 31, 2015
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
1,197

$
92

$
3,094

$
493

$
—

$
—

$
4,876

Collectively evaluated
   for impairment
164,199

42,797

227,348

20,904

3,963

36,419

495,630

Total
$
165,396

$
42,889

$
230,442

$
21,397

$
3,963

$
36,419

$
500,506
Financing Receivable Credit Quality Indicators [Table Text Block]
The following tables summarize the loan ratings applied to the Company's loans by class as of the balance sheet dates:
September 30, 2016
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Pass
$
152,180

$
31,198

$
171,007

$
29,626

$
3,880

$
37,788

$
425,679

Satisfactory/Monitor
10,316

4,219

70,428

2,589

33

—

87,585

Substandard
4,106

114

4,207

669

1

—

9,097

Total
$
166,602

$
35,531

$
245,642

$
32,884

$
3,914

$
37,788

$
522,361


December 31, 2015
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Pass
$
150,535

$
37,750

$
175,438

$
18,347

$
3,902

$
36,419

$
422,391

Satisfactory/Monitor
11,329

4,968

49,745

2,384

61

—

68,487

Substandard
3,532

171

5,259

666

—

—

9,628

Total
$
165,396

$
42,889

$
230,442

$
21,397

$
3,963

$
36,419

$
500,506
Impaired Financing Receivables [Table Text Block]
The following table provides information with respect to impaired loans by class of loan as of and for the three and nine months ended September 30, 2016:
 
As of September 30, 2016
For The Three Months Ended September 30, 2016
For The Nine Months Ended September 30, 2016
 
Recorded Investment
(1)
Principal Balance
(1)
Related Allowance
Average Recorded Investment
Interest Income Recognized
Average Recorded Investment
Interest Income Recognized
 
(Dollars in thousands)
Residential real estate
$
258

$
267

$
57

 
 
 
 
Commercial real estate
501

530

61

 
 
 
 
With an allowance recorded
759

797

118

 
 
 
 
 
 
 
 
 
 
 
 
Residential real estate
1,130

1,521

—

 
 
 
 
Construction real estate
89

89

—

 
 
 
 
Commercial real estate
2,382

2,451

—

 
 
 
 
Commercial
451

451

—

 
 
 
 
With no allowance recorded
4,052

4,512

—

 
 
 
 
 
 
 
 
 
 
 
 
Residential real estate
1,388

1,788

57

$
1,346

$
7

$
1,266

$
23

Construction real estate
89

89

—

89

1

91

3

Commercial real estate
2,883

2,981

61

3,018

28

3,059

59

Commercial
451

451

—

456

—

470

—

Total
$
4,811

$
5,309

$
118

$
4,909

$
36

$
4,886

$
85

____________________
(1)
Does not reflect government guaranties on impaired loans as of September 30, 2016 totaling $654 thousand.

The following table provides information with respect to impaired loans by class of loan as of and for the three and nine months ended September 30, 2015:
 
As of September 30, 2015
For The Three Months Ended September 30, 2015
For The Nine Months Ended September 30, 2015
 
Recorded Investment
(1)
Principal Balance
(1)
Related Allowance
Average Recorded Investment
Interest Income Recognized
Average Recorded Investment
Interest Income Recognized
 
(Dollars in thousands)
Residential real estate
$
1,185

$
1,346

$
63

$
935

$
10

$
878

$
24

Construction real estate
93

93

2

94

1

179

18

Commercial real estate
3,815

3,892

320

3,947

46

3,630

151

Commercial
—

—

—

—

—

31

—

Total
$
5,093

$
5,331

$
385

$
4,976

$
57

$
4,718

$
193


____________________
(1)
Does not reflect government guaranties on impaired loans as of September 30, 2015 totaling $238 thousand.

The following table provides information with respect to impaired loans as of December 31, 2015:
 
December 31, 2015
 
 
 
Recorded Investment
(1)
Principal Balance
(1)
Related Allowance
 
 
 
(Dollars in thousands)
 
 
Residential real estate
$
659

$
668

$
109

 
 
Commercial real estate
2,142

2,161

227

 
 
Commercial
493

493

21

 
 
With an allowance recorded
3,294

3,322

357

 
 
 
 
 
 
 
 
Residential real estate
538

697

—

 
 
Construction real estate
92

92

—

 
 
Commercial real estate
952

1,015

—

 
 
With no allowance recorded
1,582

1,804

—

 
 
 
 
 
 
 
 
Residential real estate
1,197

1,365

109

 
 
Construction real estate
92

92

—

 
 
Commercial real estate
3,094

3,176

227

 
 
Commercial
493

493

21

 
 
Total
$
4,876

$
5,126

$
357

 
 
____________________
(1)
Does not reflect government guaranties on impaired loans as of December 31, 2015 totaling $606 thousand.
Troubled Debt Restructurings on Financing Receivables [Table Text Block]
The following is a summary of TDR loans by class of loan as of the balance sheet dates:
 
September 30, 2016
December 31, 2015
 
Number of Loans
Principal Balance
Number of Loans
Principal Balance
 
(Dollars in thousands)
Residential real estate
17

$
1,388

11

$
1,197

Construction real estate
1

89

1

92

Commercial real estate
10

1,475

5

950

Commercial
2

451

2

493

Total
30

$
3,403

19

$
2,732
New Troubled Debt Restructurings on Financing Receivables [Table Text Block]
The following table provides new TDR activity for the three and nine months ended September 30, 2016:
 
New TDRs During the
New TDRs During the
 
Three Months Ended September 30, 2016
Nine Months Ended September 30, 2016
 
Number of Loans
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Number of Loans
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
 
(Dollars in thousands)
Residential real estate
3

$
89

$
99

6

$
278

$
295

Commercial real estate
4

643

647

6

803

807

The following table provides new TDR activity for the three and nine months ended September 30, 2015.
 
New TDRs During the
New TDRs During the
 
Three Months Ended September 30, 2015
Nine Months Ended September 30, 2015
 
Number of Loans
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Number of Loans
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
 
(Dollars in thousands)
Residential real estate
5

$
504

$
511

5

$
504

$
511

Commercial real estate
—

—

—

2

281

281