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Allowance for Loan Losses and Reserve for Unfunded Lending Commitments (Tables)
 12 Months Ended
Dec. 31, 2017
Provision for Loan and Lease Losses [Abstract]  
Schedule of changes in the allowance for loan losses
Changes in the allowance for loan losses and the reserve for unfunded lending commitments for each of the years in the three-year period ended December 31, 2017, are presented below (dollars in thousands):
 
Years Ended December 31,
 
2017
 
2016
 
2015
Allowance for Loan Losses
 
 
 
 
 
Balance, beginning of year
$
12,801

 
$
12,601

 
$
12,427

Provision for loan losses
1,016

 
250

 
950

Charge-offs
(690
)
 
(326
)
 
(1,200
)
Recoveries
476

 
276

 
424

Balance, end of year
$
13,603

 
$
12,801

 
$
12,601

 
 
 
 
 
 
 
Years Ended December 31,
 
2017
 
2016
 
2015
Reserve for Unfunded Lending Commitments
 

 
 

 
 

Balance, beginning of year
$
203

 
$
184

 
$
163

Provision for unfunded commitments
3

 
19

 
21

Charge-offs
—

 
—

 
—

Balance, end of year
$
206

 
$
203

 
$
184

The following table presents the Company's allowance for loan losses by portfolio segment and the related loan balance total by segment for the year ended December 31, 2017 (dollars in thousands):
  
Commercial
 
Commercial Real Estate
 
Residential Real Estate
 
Consumer
 
Unallocated
 
Total
Allowance for Loan Losses
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2016
$
2,095

 
$
7,355

 
$
3,303

 
$
48

 
$
—

 
$
12,801

Charge-offs
(282
)
 
(93
)
 
(172
)
 
(143
)
 
—

 
(690
)
Recoveries
223

 
60

 
85

 
108

 
—

 
476

Provision
377

 
999

 
(391
)
 
31

 
—

 
1,016

Balance at December 31, 2017
$
2,413

 
$
8,321

 
$
2,825

 
$
44

 
$
—

 
$
13,603

 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2017:
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 
 
 
Allowance for Loan Losses
 

 
 

 
 

 
 

 
 

 
 

Individually evaluated for impairment
$
154

 
$
—

 
$
13

 
$
—

 
$
—

 
$
167

Collectively evaluated for impairment
2,259

 
8,203

 
2,645

 
44

 
—

 
13,151

Acquired impaired loans
—

 
118

 
167

 
—

 
—

 
285

Total
$
2,413

 
$
8,321

 
$
2,825

 
$
44

 
$
—

 
$
13,603

 
 
 
 
 
 
 
 
 
 
 
 
Loans
 

 
 

 
 

 
 

 
 

 
 

Individually evaluated for impairment
$
206

 
$
862

 
$
2,144

 
$
5

 
$
—

 
$
3,217

Collectively evaluated for impairment
251,185

 
747,819

 
306,066

 
4,408

 
—

 
1,309,478

Acquired impaired loans
275

 
12,167

 
10,973

 
15

 
—

 
23,430

Total
$
251,666

 
$
760,848

 
$
319,183

 
$
4,428

 
$
—

 
$
1,336,125

The following table presents the Company's allowance for loan losses by portfolio segment and the related loan balance total by segment for the year ended December 31, 2016 (dollars in thousands):
 
Commercial
 
Commercial Real Estate
 
Residential Real Estate
 
Consumer
 
Unallocated
 
Total
Allowance for Loan Losses
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2015
$
2,065

 
$
6,930

 
$
3,546

 
$
60

 
$
—

 
$
12,601

Charge-offs
(40
)
 
(10
)
 
(87
)
 
(189
)
 
—

 
(326
)
Recoveries
40

 
32

 
68

 
136

 
—

 
276

Provision
30

 
403

 
(224
)
 
41

 
—

 
250

Balance at December 31, 2016
$
2,095

 
$
7,355

 
$
3,303

 
$
48

 
$
—

 
$
12,801

 
 
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2016:
 

 
 

 
 

 
 

 
 

 
 

 
 
 
 
 
 
 
 
 
 
 
 
Allowance for Loan Losses
 

 
 

 
 

 
 

 
 

 
 

Individually evaluated for impairment
$
—

 
$
—

 
$
23

 
$
—

 
$
—

 
$
23

Collectively evaluated for impairment
2,087

 
7,248

 
3,046

 
48

 
—

 
12,429

Acquired impaired loans
8

 
107

 
234

 
—

 
—

 
349

Total
$
2,095

 
$
7,355

 
$
3,303

 
$
48

 
$
—

 
$
12,801

 
 
 
 
 
 
 
 
 
 
 
 
Loans
 

 
 

 
 

 
 

 
 

 
 

Individually evaluated for impairment
$
43

 
$
2,186

 
$
2,588

 
$
27

 
$
—

 
$
4,844

Collectively evaluated for impairment
208,258

 
610,462

 
307,600

 
4,988

 
—

 
1,131,308

Acquired impaired loans
416

 
12,570

 
15,667

 
16

 
—

 
28,669

Total
$
208,717

 
$
625,218

 
$
325,855

 
$
5,031

 
$
—

 
$
1,164,821