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Securities (Tables)
 3 Months Ended
Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Held to maturity securities
Amortized costs and fair values of securities held to maturity are summarized as follows.
 
March 31, 2016
(Dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Held to Maturity
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
6,477

 
$
—

 
$
(35
)
 
$
6,442

Corporate securities
2,750

 
17

 
—

 
2,767

Total
$
9,227

 
$
17

 
$
(35
)
 
$
9,209


 
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 held to maturity as of March 31, 2016, by contractual maturity are shown below. 
 
March 31, 2016
(Dollars in thousands)
Amortized
Cost
 
Fair
Value
Held to Maturity
 
 
 
Due after five years through ten years
$
2,750

 
$
2,767

Due after ten years
6,477

 
6,442

Total
$
9,227

 
$
9,209
Amortized costs and fair values of securities available for sale
Amortized costs and fair values of securities available for sale are summarized as follows:
 
March 31, 2016
(Dollars in thousands)
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair
Value
Available for Sale
 
 
 
 
 
 
 
U.S. government agencies
$
79,817

 
$
1,062

 
$
(93
)
 
$
80,786

Obligations of states and political subdivisions
68,920

 
2,021

 
(355
)
 
70,586

Mortgage-backed securities:
 
 
 
 
 
 
 
Agency
135,239

 
3,940

 
(621
)
 
138,558

Non-agency
12,062

 
94

 
(59
)
 
12,097

Other asset backed securities
59,584

 
405

 
(893
)
 
59,096

Corporate securities
16,688

 
16

 
(802
)
 
15,902

Total
$
372,310

 
$
7,538

 
$
(2,823
)
 
$
377,025


 
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
The amortized cost and fair value of securities available for sale as of March 31, 2016, by contractual maturity are shown below.  Maturities may differ from contractual maturities in corporate and mortgage-backed securities because the securities and mortgages underlying the securities may be called or repaid without any penalties.  Therefore, these securities are not included in the maturity categories in the following maturity summary.
 
March 31, 2016
(Dollars in thousands)
Amortized
Cost
 
Fair
Value
Due in one year or less
$
482

 
$
482

Due after one year through five years
10,142

 
10,412

Due after five years through ten years
25,249

 
24,994

Due after ten years
129,552

 
131,386

Mortgage-backed securities
147,301

 
150,655

Other asset backed securities
59,584

 
59,096

Total
$
372,310

 
$
377,025
Investments in an unrealized loss position
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
March 31, 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
 
$
1,422

 
$
(35
)
 
$
—

 
$
—

 
$
1,422

 
$
(35
)
Total
 
$
1,422

 
$
(35
)
 
$
—

 
$
—

 
$
1,422

 
$
(35
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Available for Sale
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agencies
 
$
11,671

 
$
(68
)
 
$
2,840

 
$
(25
)
 
$
14,511

 
$
(93
)
Obligations of states and political subdivisions
 
4,641

 
(50
)
 
6,589

 
(305
)
 
11,230

 
(355
)
Mortgage-backed securities:
 
 

 
 

 
 

 
 

 
 

 
 

Agency
 
17,296

 
(186
)
 
10,814

 
(435
)
 
28,110

 
(621
)
Non-agency
 
2,069

 
(26
)
 
999

 
(33
)
 
3,068

 
(59
)
Other asset backed securities
 
30,654

 
(541
)
 
14,004

 
(352
)
 
44,658

 
(893
)
Corporate securities
 
1,450

 
(100
)
 
11,110

 
(702
)
 
12,560

 
(802
)
Total
 
$
67,781

 
$
(971
)
 
$
46,356

 
$
(1,852
)
 
$
114,137

 
$
(2,823
)


(Dollars in thousands)
 
Less than Twelve Months
 
Twelve Months or Greater
 
Total
December 31, 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
)