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Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Held to Maturity Securities
Amortized costs and fair values of securities being held to maturity as of December 31, 2016 and 2015, are summarized as follows:
 
December 31, 2016
(Dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Held to Maturity
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
6,433

 
$
—

 
$
(594
)
 
$
5,839

Corporate securities
4,250

 
21

 
(15
)
 
4,256

Total
$
10,683

 
$
21

 
$
(609
)
 
$
10,095


 
December 31, 2015
(Dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Held to Maturity
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
1,457

 
$
—

 
$
(38
)
 
$
1,419

Corporate securities
2,750

 
24

 
(30
)
 
2,744

Total
$
4,207

 
$
24

 
$
(68
)
 
$
4,163


The amortized cost and fair value of securities being held to maturity as of December 31, 2016, by contractual maturity are shown below. 
 
December 31, 2016
(Dollars in thousands)
Amortized Cost
 
Fair Value
Held to Maturity
 
 
 
Due after five years through ten years
$
4,250

 
$
4,256

Due after ten years
6,433

 
5,839

Total
$
10,683

 
$
10,095
Amortized Costs and Fair Values of Securities Available for Sale
Amortized costs and fair values of securities available for sale as of December 31, 2016 and 2015, are summarized as follows:
 
December 31, 2016
(Dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Available for Sale
 
 
 
 
 
 
 
U.S. government agencies
$
73,546

 
$
209

 
$
(571
)
 
$
73,184

Obligations of states and political subdivisions
62,896

 
1,019

 
(542
)
 
63,373

Mortgage-backed securities:
 
 
 
 
 
 
 
Agency
98,549

 
646

 
(1,144
)
 
98,051

Non-agency
9,991

 
16

 
(74
)
 
9,933

Other asset backed securities
41,860

 
361

 
(616
)
 
41,605

Corporate securities
16,648

 
—

 
(1,227
)
 
15,421

Total
$
303,490

 
$
2,251

 
$
(4,174
)
 
$
301,567


 
December 31, 2015
(Dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Available for Sale
 
 
 
 
 
 
 
U.S. government agencies
$
79,005

 
$
315

 
$
(380
)
 
$
78,940

Obligations of states and political subdivisions
74,071

 
1,956

 
(434
)
 
75,593

Mortgage-backed securities:
 
 
 
 
 
 
 

Agency
129,360

 
3,046

 
(745
)
 
131,661

Non-agency
12,782

 
33

 
(38
)
 
12,777

Other asset backed securities
58,958

 
426

 
(603
)
 
58,781

Corporate securities
17,557

 
22

 
(760
)
 
16,819

Total
$
371,733

 
$
5,798

 
$
(2,960
)
 
$
374,571
Amortized Cost and Fair Value of Securities Available for Sale by Contractual Maturity
Therefore, these securities are not included in the maturity categories in the following maturity summary.
 
December 31, 2016
(Dollars in thousands)
Amortized Cost
 
Fair Value
Available for Sale
 
 
 
Due in one year or less
$
777

 
$
777

Due after one year through five years
9,020

 
9,219

Due after five years through ten years
25,004

 
24,174

Due after ten years
118,289

 
117,808

Mortgage-backed securities
108,540

 
107,984

Other asset backed securities
41,860

 
41,605

Total
$
303,490

 
$
301,567
Investments in Continuous Unrealized Loss Position
At December 31, 2016 and 2015, investments in an unrealized loss position that are temporarily impaired are as follows:
(Dollars in thousands)
 
Less than Twelve Months
 
Twelve Months or Greater
 
Total
2016
 
Fair Value
 
Gross
Unrealized Losses
 
Fair Value
 
Gross
Unrealized Losses
 
Fair Value
 
Gross
Unrealized Losses
Held to Maturity
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
5,839

 
$
(594
)
 
$
—

 
$
—

 
$
5,839

 
$
(594
)
Corporate securities
 
1,485

 
(15
)
 
—

 
—

 
1,485

 
(15
)
Total
 
$
7,324

 
$
(609
)
 
$
—

 
$
—

 
$
7,324

 
$
(609
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Available for Sale
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies
 
$
46,700

 
$
(495
)
 
$
7,174

 
$
(76
)
 
$
53,874

 
$
(571
)
Obligations of states and political subdivisions
 
12,670

 
(257
)
 
6,968

 
(285
)
 
19,638

 
(542
)
Mortgage-backed securities:
 
 

 
 

 
 

 
 

 
 

 
 

Agency
 
51,018

 
(634
)
 
13,020

 
(510
)
 
64,038

 
(1,144
)
Non-agency
 
5,379

 
(68
)
 
1,944

 
(6
)
 
7,323

 
(74
)
Other asset backed securities
 
7,007

 
(284
)
 
16,388

 
(332
)
 
23,395

 
(616
)
Corporate securities
 
5,912

 
(241
)
 
9,262

 
(986
)
 
15,174

 
(1,227
)
Total
 
$
128,686

 
$
(1,979
)
 
$
54,756

 
$
(2,195
)
 
$
183,442

 
$
(4,174
)


(Dollars in thousands)
 
Less than Twelve Months
 
Twelve Months or Greater
 
Total
2015
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
 
Fair Value
 
Gross Unrealized Losses
Held to Maturity
 
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
 
$
1,419

 
$
(38
)
 
$
—

 
$
—

 
$
1,419

 
$
(38
)
Corporate securities
 
1,970

 
(30
)
 
—

 
—

 
1,970

 
(30
)
Total
 
$
3,389

 
$
(68
)
 
$
—

 
$
—

 
$
3,389

 
$
(68
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Available for Sale
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies
 
$
46,000

 
$
(304
)
 
$
4,223

 
$
(76
)
 
$
50,223

 
$
(380
)
Obligations of states and political subdivisions
 
16,559

 
(324
)
 
1,082

 
(110
)
 
17,641

 
(434
)
Mortgage-backed securities:
 
 
 
 
 
 
 
 
 
 

 
 

Agency
 
27,627

 
(402
)
 
9,911

 
(343
)
 
37,538

 
(745
)
Non-agency
 
7,842

 
(37
)
 
671

 
(1
)
 
8,513

 
(38
)
Other asset backed securities
 
25,399

 
(276
)
 
12,037

 
(327
)
 
37,436

 
(603
)
Corporate securities
 
10,740

 
(378
)
 
4,866

 
(382
)
 
15,606

 
(760
)
Total
 
$
134,167

 
$
(1,721
)
 
$
32,790

 
$
(1,239
)
 
$
166,957

 
$
(2,960
)