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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost and estimated fair value of securities
The amortized cost and estimated fair value of securities were as follows:
 
 
 
September 30, 2015
 
 
Amortized
 Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
 
(in thousands)
Investment securities available for sale:
 
 

 
 
 
 
 
 
Municipal bonds
 
$
129,064

 
$
1,266

 
$
(326
)
 
$
130,004

Mortgage-backed securities
 
160,929

 
700

 
(486
)
 
161,143

Total securities available for sale
 
$
289,993

 
$
1,966

 
$
(812
)
 
$
291,147


 
 
December 31, 2014
 
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
 
(in thousands)
Investment securities available for sale:
 
 

 
 

 
 

 
 

Municipal bonds
 
$
88,599

 
$
1,235

 
$
(173
)
 
$
89,661

Mortgage-backed securities
 
112,159

 
432

 
(614
)
 
111,977

Total securities available for sale
 
$
200,758

 
$
1,667

 
$
(787
)
 
$
201,638


 
 
September 30, 2014
 
 
Amortized
 Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
 
(in thousands)
Investment securities available for sale:
 
 

 
 

 
 

 
 

Municipal bonds
 
$
97,358

 
$
1,495

 
$
(268
)
 
98,585

Mortgage-backed securities
 
184,701

 
180

 
(1,264
)
 
183,617

Total securities available for sale
 
$
282,059

 
$
1,675

 
$
(1,532
)
 
$
282,202
Schedule of number, fair value and gross unrealized holding losses of the Company's investment securities by investment category and length of time that the securities have been in a continuous loss position
The table below shows the number, fair value and gross unrealized holding losses of the Company’s investment securities by investment category and length of time that the securities have been in a continuous loss position.
 
 
September 30, 2015
 
Less than 12 months
 
12 months or Longer
 
Total
 
Number
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Number
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Number
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
(dollars in thousands)
Municipal bonds
64

 
$
37,405

 
$
(248
)
 
7

 
$
3,612

 
$
(78
)
 
71

 
$
41,017

 
$
(326
)
Mortgage-backed securities
17

 
57,803

 
(139
)
 
3

 
13,613

 
(347
)
 
20

 
71,416

 
(486
)
Total
81

 
$
95,208

 
$
(387
)
 
10

 
$
17,225

 
$
(425
)
 
91

 
$
112,433

 
$
(812
)

 
December 31, 2014
 
Less than 12 months
 
12 months or Longer
 
Total
 
Number
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Number
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Number
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
(dollars in thousands)
Municipal bonds
35

 
$
18,129

 
$
(117
)
 
16

 
$
6,510

 
$
(56
)
 
51

 
$
24,639

 
$
(173
)
Mortgage-backed securities
7

 
24,353

 
(105
)
 
4

 
18,842

 
(509
)
 
11

 
43,195

 
(614
)
Total
42

 
$
42,482

 
$
(222
)
 
20

 
$
25,352

 
$
(565
)
 
62

 
$
67,834

 
$
(787
)
 
September 30, 2014
 
Less than 12 months
 
12 months or Longer
 
Total
 
Number
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Number
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
Number
 
Fair
Value
 
Gross
Unrealized
Holding
Losses
 
(dollars in thousands)
Municipal bonds
29

 
$
16,804

 
$
(183
)
 
26

 
$
10,459

 
$
(85
)
 
55

 
$
27,263

 
$
(268
)
Mortgage-backed securities
22

 
85,248

 
(256
)
 
9

 
42,516

 
(1,008
)
 
31

 
127,764

 
(1,264
)
Total
51

 
$
102,052

 
$
(439
)
 
35

 
$
52,975

 
$
(1,093
)
 
86

 
$
155,027

 
$
(1,532
)
Schedule of amortized cost and estimated fair value of investment securities available for sale by contractual maturity
The amortized cost and estimated fair value of investment securities available for sale at September 30, 2015, by contractual maturity are shown in the table below.

 
 
One Year
or Less
 
More than One
Year to Five Years
 
More than Five Years
to Ten Years
 
More than
Ten Years
 
Total
 
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
 
(dollars in thousands)
Investment securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Municipal bonds
 
$
840

 
$
843

 
$
25,480

 
$
25,605

 
$
45,233

 
$
45,628

 
$
57,511

 
$
57,928

 
$
129,064

 
$
130,004

Mortgage-backed securities
 
—

 
—

 
—

 
—

 
25,566

 
25,744

 
135,363

 
135,399

 
160,929

 
161,143

Total investment securities available for sale
 
$
840

 
$
843

 
$
25,480

 
$
25,605

 
$
70,799

 
$
71,372

 
$
192,874

 
$
193,327

 
$
289,993

 
$
291,147