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Allowance for loan losses and credit quality (Tables)
 6 Months Ended
Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]  
Allowance for Credit Losses on Financing Receivables [Table Text Block]
Changes in the ALL, by class of loans, for the three and six months ended June 30, 2017 and 2016 were as follows:
For The Three Months Ended June 30, 2017
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Balance, March 31, 2017
$
1,372

$
442

$
2,661

$
346

$
24

$
42

$
305

$
5,192

Provision (credit) for loan losses
39

36

92

15

4

(16
)
(170
)
—

Recoveries of amounts charged off
—

3

—

1

—

—

—

4

 
1,411

481

2,753

362

28

26

135

5,196

Amounts charged off
(24
)
—

—

—

(4
)
—

—

(28
)
Balance, June 30, 2017
$
1,387

$
481

$
2,753

$
362

$
24

$
26

$
135

$
5,168

For The Three Months Ended June 30, 2016
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Balance, March 31, 2016
$
1,386

$
466

$
2,729

$
218

$
25

$
47

$
254

$
5,125

Provision (credit) for loan losses
(19
)
(96
)
108

16

—

(21
)
87

75

Recoveries of amounts charged off
15

3

—

6

2

—

—

26

 
1,382

373

2,837

240

27

26

341

5,226

Amounts charged off
—

—

—

—

—

—

—

—

Balance, June 30, 2016
$
1,382

$
373

$
2,837

$
240

$
27

$
26

$
341

$
5,226

For The Six Months Ended June 30, 2017
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Balance, December 31, 2016
$
1,399

$
391

$
2,687

$
342

$
26

$
40

$
362

$
5,247

Provision (credit) for loan
  losses
68

84

66

19

4

(14
)
(227
)
—

Recoveries of amounts
  charged off
2

6

—

1

1

—

—

10

 
1,469

481

2,753

362

31

26

135

5,257

Amounts charged off
(82
)
—

—

—

(7
)
—

—

(89
)
Balance, June 30, 2017
$
1,387

$
481

$
2,753

$
362

$
24

$
26

$
135

$
5,168

For The Six Months Ended June 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
68

(147
)
45

57

(1
)
(12
)
140

150

Recoveries of amounts
  charged off
15

6

—

7

3

—

—

31

 
1,502

373

2,837

273

30

26

341

5,382

Amounts charged off
(120
)
—

—

(33
)
(3
)
—

—

(156
)
Balance, June 30, 2016
$
1,382

$
373

$
2,837

$
240

$
27

$
26

$
341

$
5,226
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:
June 30, 2017
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
59

$
—

$
24

$
—

$
—

$
—

$
—

$
83

Collectively evaluated
   for impairment
1,328

481

2,729

362

24

26

135

5,085

Total allocated
$
1,387

$
481

$
2,753

$
362

$
24

$
26

$
135

$
5,168

December 31, 2016
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Unallocated
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
63

$
—

$
40

$
—

$
—

$
—

$
—

$
103

Collectively evaluated
   for impairment
1,336

391

2,647

342

26

40

362

5,144

Total allocated
$
1,399

$
391

$
2,687

$
342

$
26

$
40

$
362

$
5,247
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:
June 30, 2017
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
1,770

$
85

$
1,768

$
408

$
—

$
—

$
4,031

Collectively evaluated
   for impairment
173,552

40,650

250,586

46,190

3,537

17,654

532,169

Total
$
175,322

$
40,735

$
252,354

$
46,598

$
3,537

$
17,654

$
536,200

December 31, 2016
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Individually evaluated
   for impairment
$
1,448

$
88

$
3,328

$
432

$
—

$
—

$
5,296

Collectively evaluated
   for impairment
171,279

34,101

245,735

41,567

3,962

31,350

527,994

Total
$
172,727

$
34,189

$
249,063

$
41,999

$
3,962

$
31,350

$
533,290
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:
June 30, 2017
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Pass
$
161,187

$
30,693

$
166,271

$
41,817

$
3,475

$
17,654

$
421,097

Satisfactory/Monitor
10,535

9,893

82,212

3,933

62

—

106,635

Substandard
3,600

149

3,871

848

—

—

8,468

Total
$
175,322

$
40,735

$
252,354

$
46,598

$
3,537

$
17,654

$
536,200


December 31, 2016
Residential Real Estate
Construction Real Estate
Commercial Real Estate
Commercial
Consumer
Municipal
Total
 
(Dollars in thousands)
Pass
$
158,140

$
29,248

$
182,247

$
38,219

$
3,928

$
31,350

$
443,132

Satisfactory/Monitor
10,641

4,830

62,193

3,109

34

—

80,807

Substandard
3,946

111

4,623

671

—

—

9,351

Total
$
172,727

$
34,189

$
249,063

$
41,999

$
3,962

$
31,350

$
533,290
Impaired Financing Receivables [Table Text Block]
The following tables provide information with respect to impaired loans by class of loan as of and for the three and six months ended June 30, 2017 and June 30, 2016:
 
As of June 30, 2017
For The Three Months Ended June 30, 2017
For The Six Months Ended June 30, 2017
 
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
$
303

$
312

$
59

 
 
 
 
Commercial real estate
393

393

24

 
 
 
 
With an allowance recorded
696

705

83

 
 
 
 
 
 
 
 
 
 
 
 
Residential real estate
1,467

1,977

—

 
 
 
 
Construction real estate
85

85

—

 
 
 
 
Commercial real estate
1,375

1,447

—

 
 
 
 
Commercial
408

408

—

 
 
 
 
With no allowance recorded
3,335

3,917

—

 
 
 
 
 
 
 
 
 
 
 
 
Residential real estate
1,770

2,289

59

$
1,675

$
20

$
1,599

$
31

Construction real estate
85

85

—

86

1

86

2

Commercial real estate
1,768

1,840

24

1,994

22

2,439

54

Commercial
408

408

—

412

5

419

12

Total
$
4,031

$
4,622

$
83

$
4,167

$
48

$
4,543

$
99

____________________
(1)
Does not reflect government guaranties on impaired loans as of June 30, 2017 totaling $635 thousand.

 
As of June 30, 2016
For The Three Months Ended June 30, 2016
For The Six Months Ended June 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
$
1,304

$
1,663

$
58

$
1,240

$
8

$
1,226

$
16

Construction real estate
90

90

—

90

1

91

2

Commercial real estate
3,153

3,247

84

3,130

17

3,118

31

Commercial
460

461

—

468

—

476

—

Total
$
5,007

$
5,461

$
142

$
4,928

$
26

$
4,911

$
49


____________________
(1)
Does not reflect government guaranties on impaired loans as of June 30, 2016 totaling $578 thousand.

The following table provides information with respect to impaired loans as of December 31, 2016:
 
December 31, 2016
 
 
 
Recorded Investment
(1)
Principal Balance
(1)
Related Allowance
 
 
 
(Dollars in thousands)
 
 
Residential real estate
$
308

$
317

$
63

 
 
Commercial real estate
488

520

40

 
 
With an allowance recorded
796

837

103

 
 
 
 
 
 
 
 
Residential real estate
1,140

1,561

—

 
 
Construction real estate
88

88

—

 
 
Commercial real estate
2,840

2,910

—

 
 
Commercial
432

432

—

 
 
With no allowance recorded
4,500

4,991

—

 
 
 
 
 
 
 
 
Residential real estate
1,448

1,878

63

 
 
Construction real estate
88

88

—

 
 
Commercial real estate
3,328

3,430

40

 
 
Commercial
432

432

—

 
 
Total
$
5,296

$
5,828

$
103

 
 
____________________
(1)
Does not reflect government guaranties on impaired loans as of December 31, 2016 totaling $637 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:
 
June 30, 2017
December 31, 2016
 
Number of Loans
Principal Balance
Number of Loans
Principal Balance
 
(Dollars in thousands)
Residential real estate
26

$
1,770

20

$
1,448

Construction real estate
1

85

1

88

Commercial real estate
10

965

10

1,452

Commercial
2

408

2

431

Total
39

$
3,228

33

$
3,419
New Troubled Debt Restructurings on Financing Receivables [Table Text Block]
The following tables provide new TDR activity for the three and six months ended June 30, 2017 and June 30, 2016:
 
New TDRs During the
New TDRs During the
 
Three Months Ended June 30, 2017
Six Months Ended June 30, 2017
 
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

$
240

$
248

6

$
380

$
397

Commercial real estate
1

144

144

1

144

144


 
New TDRs During the
New TDRs During the
 
Three Months Ended June 30, 2016
Six Months Ended June 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
2

$
132

$
139

3

$
189

$
196

Commercial real estate
2

160

160

2

160

160