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Investments (Tables)
 6 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities
The cost or amortized cost, gross unrealized gain or loss, and estimated fair value of the investments in securities classified as available for sale at June 30, 2018 and December 31, 2017, were as follows (dollars in thousands):
 
June 30, 2018
 
Cost or
Amortized
Cost
Gross Unrealized
Estimated
Fair Value 
 
 
Gains
Losses
Debt Securities:
 
 
 
 
U.S. Government
$
16,007

$
2

$
(266
)
$
15,743

State and local government
16,536

96

(221
)
16,411

Corporate debt
32,201

79

(739
)
31,541

Asset-backed securities
25,780

27

(153
)
25,654

Mortgage-backed securities
32,554

11

(1,331
)
31,234

Commercial mortgage-backed securities
3,916

—

(96
)
3,820

Collateralized mortgage obligations
2,328

9

(63
)
2,274

Total debt securities available for sale
129,322

224

(2,869
)
126,677

 
December 31, 2017
 
Cost or
Amortized
Cost
Gross Unrealized
Estimated
Fair Value 
 
Gains
Losses
Debt Securities:
 
 
 
 
U.S. Government
$
17,179

$
10

$
(99
)
$
17,090

State and local government
17,302

255

(54
)
17,503

Corporate debt
38,947

170

(209
)
38,908

Asset-backed securities
23,539

36

(35
)
23,540

Mortgage-backed securities
33,942

38

(522
)
33,458

Commercial mortgage-backed securities
3,532

3

(44
)
3,491

Collateralized mortgage obligations
2,563

19

(36
)
2,546

Total debt securities available for sale
137,004

531

(999
)
136,536

Equity Securities (1)
8,629

1,240

(182
)
9,687

Total securities available for sale
$
145,633

$
1,771

$
(1,181
)
$
146,223


(1) Effective January 1, 2018, the Company adopted ASU No. 2016-01. As a result, equity securities are no longer classified as available-for-sale. Prior periods have not been recast to conform to the current presentation. Refer to Note 1 ~ Summary of Significant Accounting Policies for further details.
Schedule of Unrealized Loss Positions
The following table summarizes the aggregate fair value and gross unrealized losses, by security type, of the available-for-sale securities in unrealized loss positions. The table segregates the holdings based on the length of time that individual securities have been in a continuous unrealized loss position, as follows (dollars in thousands): 
 
June 30, 2018
 
Less than 12 months
 
Greater than 12 months
 
Total
 
No.
of
Issues
Fair Value of
Investments
with Unrealized
Losses
Gross
Unrealized
Losses
 
No.
of
Issues
Fair Value of
Investments
with Unrealized
Losses
Gross
Unrealized
Losses
 
No.
of
Issues
Fair Value of
Investments
with Unrealized
Losses
Gross
Unrealized
Losses
Debt Securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government
13

$
13,457

$
(218
)
 
6

$
1,958

$
(48
)
 
19

$
15,415

$
(266
)
State and local government
36

9,190

(163
)
 
7

1,371

(58
)
 
43

10,561

(221
)
Corporate debt
55

17,978

(327
)
 
8

5,481

(412
)
 
63

23,459

(739
)
Asset-backed securities
32

17,619

(145
)
 
3

558

(8
)
 
35

18,177

(153
)
Mortgage-backed securities
19

8,208

(223
)
 
27

22,162

(1,108
)
 
46

30,370

(1,331
)
Commercial mortgage-backed securities
4

2,718

(37
)
 
2

659

(59
)
 
6

3,377

(96
)
Collateralized mortgage obligations
10

1,881

(63
)
 
—

—

—

 
10

1,881

(63
)
Total debt securities available for sale
169

71,051

(1,176
)
 
53

32,189

(1,693
)
 
222

103,240

(2,869
)
 
December 31, 2017
 
Less than 12 months
 
Greater than 12 months
 
Total
 
No.
of
Issues
Fair Value of
Investments
with Unrealized
Losses
Gross
Unrealized
Losses
 
No.
of
Issues
Fair Value of
Investments
with Unrealized
Losses
Gross
Unrealized
Losses
 
No.
of
Issues
Fair Value of
Investments
with Unrealized
Losses
Gross
Unrealized
Losses
Debt Securities:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government
12

$
11,555

$
(64
)
 
7

$
2,207

$
(35
)
 
19

$
13,762

$
(99
)
State and local government
10

3,511

(20
)
 
7

1,424

(34
)
 
17

4,935

(54
)
Corporate debt
38

15,236

(46
)
 
10

6,555

(163
)
 
48

21,791

(209
)
Asset-backed securities
20

13,948

(29
)
 
3

915

(6
)
 
23

14,863

(35
)
Mortgage-backed securities
6

4,935

(19
)
 
26

24,939

(503
)
 
32

29,874

(522
)
Commercial mortgage-backed securities
3

2,026

(12
)
 
2

722

(32
)
 
5

2,748

(44
)
Collateralized mortgage obligations
8

1,870

(36
)
 
—

—

—

 
8

1,870

(36
)
Total debt securities available for sale
97

53,081

(226
)
 
55

36,762

(773
)
 
152

89,843

(999
)
Equity Securities (1)
13

436

(75
)
 
4

266

(107
)
 
17

702

(182
)
Total securities available for sale
110

$
53,517

$
(301
)
 
59

$
37,028

$
(880
)
 
169

$
90,545

$
(1,181
)

 (1) Effective January 1, 2018, the Company adopted ASU No. 2016-01. As a result, equity securities are no longer classified as available-for-sale. Prior periods have not been recast to conform to the current presentation. Refer to Note 1 ~ Summary of Significant Accounting Policies for further details.
Schedule of Investment Income
The Company’s sources of net investment income are as follows (dollars in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Debt securities
$
868

 
$
696

 
$
1,694

 
$
1,297

Equity securities
38

 
25

 
65

 
50

Cash and short-term investments
13

 
16

 
36

 
27

Total investment income
919

 
737

 
1,795

 
1,374

Investment expenses
(81
)
 
(74
)
 
(156
)
 
(134
)
Net investment income
$
838

 
$
663

 
$
1,639

 
$
1,240
Schedule of Gross Realized Gains and Losses on Securities
The following table summarizes the gross realized gains and losses from sales or maturities of available-for-sale debt and equity securities (dollars in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Debt securities:
 
 
 
 
 
 
 
Gross realized gains
$
—

 
$
—

 
$
2

 
$
—

Gross realized losses
(10
)
 
—

 
(15
)
 
(7
)
Total debt securities
(10
)
 
—

 
(13
)
 
(7
)
Equity securities:
 
 
 
 
 
 
 
Gross realized gains
36

 
—

 
206

 
29

Gross realized losses
(14
)
 
—

 
(20
)
 
(30
)
Total equity securities
22

 
—

 
186

 
(1
)
Total net realized investment gains (losses)
$
12

 
$
—

 
$
173

 
$
(8
)
Summary of Amortized Cost and Fair Value of Securities
The table below summarizes the amortized cost and fair value of available-for-sale debt securities by contractual maturity at June 30, 2018. Actual maturities may differ from contractual maturities because certain borrowers have the right to call or prepay obligations with or without call or prepayment penalties (dollars in thousands):
 
Amortized
Cost
 
Estimated
Fair Value
Due in one year or less
$
7,205

 
$
7,190

Due after one year through five years
35,846

 
35,292

Due after five years through ten years
12,154

 
11,832

Due after ten years
9,539

 
9,381

Securities with contractual maturities
64,744

 
63,695

Asset-backed securities
25,780

 
25,654

Mortgage-backed securities
$
32,554

 
$
31,234

Commercial mortgage-backed securities
$
3,916

 
$
3,820

Collateralized mortgage obligations
$
2,328

 
$
2,274

Total debt securities
$
129,322

 
$
126,677