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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 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:
 
 
 
December 31, 2015
 
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
 
(in thousands)
Available-for-sale:
 
 

 
 
 
 
 
 
Municipal bonds
 
$
128,546

 
$
1,796

 
$
(97
)
 
$
130,245

Collateralized mortgage obligation
 
24,722

 
4

 
(183
)
 
24,543

Mortgage-backed securities
 
126,443

 
153

 
(1,111
)
 
125,485

Total available-for-sale
 
279,711

 
1,953

 
(1,391
)
 
280,273

Held-to-maturity:
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
8,400

 
—

 
(70
)
 
8,330

Other
 
1,242

 
—

 
—

 
1,242

Total held-to-maturity
 
9,642

 
—

 
(70
)
 
9,572

Total securities
 
$
289,353

 
$
1,953

 
$
(1,461
)
 
$
289,845

 
 
 
 
 
 
 
 
 
 
 
December 31, 2014
 
 
Amortized
 
Unrealized
 
Unrealized
 
Estimated
 
 
Cost
 
Gain
 
Loss
 
Fair Value
 
 
(in thousands)
Available-for-sale:
 
 

 
 

 
 

 
 

Municipal bonds
 
$
88,599

 
$
1,235

 
$
(173
)
 
$
89,661

Collateralized mortgage obligation
 
$
6,831

 
$
31

 
$
—

 
$
6,862

Mortgage-backed securities
 
105,328

 
401

 
(614
)
 
105,115

Total available-for-sale
 
200,758

 
1,667

 
(787
)
 
201,638
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.
 
 
December 31, 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)
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Municipal bonds
32

 
$
15,516

 
$
(61
)
 
6

 
$
3,349

 
$
(36
)
 
38

 
$
18,865

 
$
(97
)
Collateralized mortgage obligation
5

 
22,771

 
(183
)
 
—

 
—

 
—

 
5

 
22,771

 
(183
)
Mortgage-backed securities
34

 
83,488

 
(679
)
 
3

 
12,935

 
(432
)
 
37

 
96,423

 
(1,111
)
Total available-for-sale
71

 
$
121,775

 
$
(923
)
 
9

 
$
16,284

 
$
(468
)
 
80

 
$
138,059

 
$
(1,391
)
Held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
1

 
$
8,330

 
$
(70
)
 
—

 
$
—

 
$
—

 
1

 
$
8,330

 
$
(70
)
Total held-to-maturity
1

 
$
8,330

 
$
(70
)
 
—

 
$
—

 
$
—

 
1

 
$
8,330

 
$
(70
)
Total securities
72

 
$
130,105

 
$
(993
)
 
9

 
$
16,284

 
$
(468
)
 
81

 
$
146,389

 
$
(1,461
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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)
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 available-for-sale
42

 
$
42,482

 
$
(222
)
 
20

 
$
25,352

 
$
(565
)
 
62

 
$
67,834

 
$
(787
)
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 December 31, 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)
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Municipal bonds
 
$
1,067

 
$
1,068

 
$
26,998

 
$
27,134

 
$
43,968

 
$
44,695

 
$
56,513

 
$
57,348

 
$
128,546

 
$
130,245

Collateralized mortgage obligation
 
—

 
—

 
—

 
—

 
—

 
—

 
24,722

 
24,543

 
24,722

 
24,543

Mortgage-backed securities
 
—

 
—

 
—

 
—

 
27,662

 
27,612

 
98,781

 
97,873

 
126,443

 
125,485

Total available-for-sale
 
1,067

 
1,068

 
26,998

 
27,134

 
71,630

 
72,307

 
180,016

 
179,764

 
279,711

 
280,273

Held-to-maturity:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Mortgage-backed securities
 
—

 
—

 
—

 
—

 
—

 
—

 
8,400

 
8,330

 
8,400

 
8,330

Other
 
—

 
—

 
—

 
—

 
—

 
—

 
1,242

 
1,242

 
1,242

 
1,242

Total held-to-maturity
 
—

 
—

 
—

 
—

 
—

 
—

 
9,642

 
9,572

 
9,642

 
9,572

Total securities
 
$
1,067

 
$
1,068

 
$
26,998

 
$
27,134

 
$
71,630

 
$
72,307

 
$
189,658

 
$
189,336

 
$
289,353

 
$
289,845