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Allowance for loan losses and credit quality (Tables)
 12 Months Ended
Dec. 31, 2015
Loans and Leases Receivable, Allowance [Abstract]  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
Changes in the ALL, by class of loans, were as follows for the years ended:
December 31, 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
136

47

375

46

12

(4
)
(62
)
550

Recoveries of amounts
   charged off
36

28

—

16

3

—

—

83

 
1,502

514

2,792

238

42

38

201

5,327

Amounts charged off
(83
)
—

—

(29
)
(14
)
—

—

(126
)
Balance, December 31, 2015
$
1,419

$
514

$
2,792

$
209

$
28

$
38

$
201

$
5,201


December 31, 2014
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Balance, December 31, 2013
$
1,251

$
390

$
2,644

$
163

$
23

$
35

$
141

$
4,647

Provision (credit) for loan
   losses
177

37

(93
)
59

36

7

122

345

Recoveries of amounts
   charged off
1

12

8

8

13

—

—

42

 
1,429

439

2,559

230

72

42

263

5,034

Amounts charged off
(99
)
—

(142
)
(54
)
(45
)
—

—

(340
)
Balance, December 31, 2014
$
1,330

$
439

$
2,417

$
176

$
27

$
42

$
263

$
4,694



December 31, 2013
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Balance, December 31, 2012
$
1,291

$
456

$
2,532

$
159

$
39

$
30

$
150

$
4,657

Provision (credit) for loan
   losses
293

(62
)
77

22

(21
)
5

(9
)
305

Recoveries of amounts
   charged off
13

12

35

6

21

—

—

87

 
1,597

406

2,644

187

39

35

141

5,049

Amounts charged off
(346
)
(16
)
—

(24
)
(16
)
—

—

(402
)
Balance, December 31, 2013
$
1,251

$
390

$
2,644

$
163

$
23

$
35

$
141

$
4,647
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:
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


December 31, 2014
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
73

$
—

$
70

$
—

$
—

$
—

$
—

$
143

Collectively evaluated
   for impairment
1,257

439

2,347

176

27

42

263

4,551

Total allocated
$
1,330

$
439

$
2,417

$
176

$
27

$
42

$
263

$
4,694
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:
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


December 31, 2014
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
950

$
275

$
3,332

$
123

$
—

$
—

$
4,680

Collectively evaluated
   for impairment
159,888

36,983

203,963

20,497

4,435

40,480

466,246

 
160,838

37,258

207,295

20,620

4,435

40,480

470,926

Acquired loans
4,637

—

4,415

—

—

—

9,052

Total
$
165,475

$
37,258

$
211,710

$
20,620

$
4,435

$
40,480

$
479,978
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:
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


December 31, 2014
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Pass
$
141,259

$
31,519

$
159,725

$
18,960

$
4,360

$
40,480

$
396,303

Satisfactory/Monitor
17,483

5,347

41,728

1,384

70

—

66,012

Substandard
2,096

392

5,842

276

5

—

8,611

 
160,838

37,258

207,295

20,620

4,435

40,480

470,926

Acquired loans
4,637

—

4,415

—

—

—

9,052

Total
$
165,475

$
37,258

$
211,710

$
20,620

$
4,435

$
40,480

$
479,978
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 year ended December 31, 2015:
 
December 31, 2015
For The Year Ended
December 31, 2015
 
Recorded Investment
(1)
Principal Balance
(1)
Related Allowance
Average Recorded Investment
Interest Income Recognized
 
(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

$
942

$
34

Construction real estate
92

92

—

162

19

Commercial real estate
3,094

3,176

227

3,523

219

Commercial
493

493

21

123

—

Total
$
4,876

$
5,126

$
357

$
4,750

$
272

____________________
(1)
Does not reflect government guaranties on impaired loans as of December 31, 2015 totaling $606 thousand.

The following table provides information with respect to impaired loans by class of loan as of and for the year ended December 31, 2014:
 
December 31, 2014
For The Year Ended
December 31, 2014
 
Recorded Investment
(1)
Principal Balance
(1)
Related Allowance
Average Recorded Investment
Interest Income Recognized
 
(Dollars in thousands)
Residential real estate
$
537

$
546

$
73

 
 
Commercial real estate
2,127

2,136

70

 
 
With an allowance recorded
2,664

2,682

143

 
 
 
 
 
 
 
 
Residential real estate
413

602

—

 
 
Construction real estate
275

298

—

 
 
Commercial real estate
1,205

1,256

—

 
 
Commercial
123

172

—

 
 
With no allowance recorded
2,016

2,328

—

 
 
 
 
 
 
 
 
Residential real estate
950

1,148

73

$
805

$
26

Construction real estate
275

298

—

314

14

Commercial real estate
3,332

3,392

70

3,883

195

Commercial
123

172

—

106

7

Total
$
4,680

$
5,010

$
143

$
5,108

$
242

____________________
(1)
Does not reflect government guaranties on impaired loans as of December 31, 2014 totaling $244 thousand.

The following table provides information with respect to impaired loans by class of loan as of and for the year ended December 31, 2013:
 
December 31, 2013
For the Year Ended
December 31, 2013
 
Recorded Investment
(1)
Principal Balance
(1)
Related Allowance
Average Recorded Investment
Interest Income Recognized
 
(Dollars in thousands)
Residential real estate
$
437

$
451

$
46

 
 
Construction real estate
322

322

13

 
 
Commercial real estate
2,534

2,534

278

 
 
With an allowance recorded
3,293

3,307

337

 
 
 
 
 
 
 
 
Residential real estate
384

612

—

 
 
Construction real estate
26

48

—

 
 
Commercial real estate
1,685

1,742

—

 
 
Commercial
109

109

—

 
 
With no allowance recorded
2,204

2,511

—

 
 
 
 
 
 
 
 
Residential real estate
821

1,063

46

$
871

$
19

Construction real estate
348

370

13

267

9

Commercial real estate
4,219

4,276

278

4,499

239

Commercial
109

109

—

118

7

Total
$
5,497

$
5,818

$
337

$
5,755

$
274

____________________
(1)
Does not reflect government guaranties on impaired loans as of December 31, 2013 totaling $669 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:
 
December 31, 2015
December 31, 2014
 
Number of Loans
Principal Balance
Number of Loans
Principal Balance
 
(Dollars in thousands)
Residential real estate
11

$
1,197

5

$
704

Construction real estate
1

92

3

276

Commercial real estate
5

950

3

711

Commercial
2

493

—

—

Total
19

$
2,732

11

$
1,691
New Troubled Debt Restructurings on Financing Receivables [Table Text Block]
The following table provides new TDR activity by class of loan for the years ended December 31, 2015 and 2014:
 
New TDRs During the
New TDRs During the
 
Year Ended December 31, 2015
Year Ended December 31, 2014
 
Number of Contracts
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
Number of Contracts
Pre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment
 
(Dollars in thousands)
Residential real estate
6

$
590

$
597

1

$
325

$
325

Commercial real estate
2

281

281

2

1,018

1,068

Commercial
2

493

493

—

—

—