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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2018
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:
 
 
June 30, 2018
 
 
Amortized
 Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
 
(dollars in thousands)
Investment securities available-for-sale:
 
 

 
 
 
 
 
 
Agency
 
$
41,567

 
$
—

 
$
(490
)
 
$
41,077

Corporate
 
93,126

 
433

 
(1,057
)
 
92,502

Municipal bonds
 
221,806

 
1,281

 
(3,186
)
 
219,901

Collateralized mortgage obligation: residential
 
29,747

 
81

 
(670
)
 
29,158

Mortgage-backed securities: residential
 
505,817

 
58

 
(13,813
)
 
492,062

Total investment securities available-for-sale
 
892,063

 
1,853

 
(19,216
)
 
874,700

Investment securities held-to-maturity:
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
 
30,854

 
—

 
(838
)
 
30,016

Other
 
1,111

 
—

 
—

 
1,111

Total investment securities held-to-maturity
 
31,965

 
—

 
(838
)
 
31,127

Total investment securities
 
$
924,028

 
$
1,853

 
$
(20,054
)
 
$
905,827


 
 
December 31, 2017
 
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
 
(dollars in thousands)
Investment securities available-for-sale:
 
 

 
 
 
 
 
 
Agency
 
$
47,051

 
$
236

 
$
(78
)
 
$
47,209

Corporate
 
78,155

 
1,585

 
(194
)
 
79,546

Municipal bonds
 
228,929

 
3,942

 
(743
)
 
232,128

Collateralized mortgage obligation: residential
 
33,984

 
132

 
(335
)
 
33,781

Mortgage-backed securities: residential
 
398,664

 
266

 
(4,165
)
 
394,765

Total investment securities available-for-sale
 
786,783

 
6,161

 
(5,515
)
 
787,429

Investment securities held-to-maturity:
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
 
17,153

 
—

 
(209
)
 
16,944

Other
 
1,138

 
—

 
—

 
1,138

Total investment securities held-to-maturity
 
18,291

 
—

 
(209
)
 
18,082

Total investment securities
 
$
805,074

 
$
6,161

 
$
(5,724
)
 
$
805,511
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.
 
June 30, 2018
 
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)
Investment securities available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency
19

 
$
39,828

 
$
(471
)
 
1

 
$
1,249

 
$
(19
)
 
20

 
$
41,077

 
$
(490
)
Corporate
16

 
48,326

 
(880
)
 
2

 
6,014

 
(177
)
 
18

 
54,340

 
(1,057
)
Municipal bonds
163

 
116,648

 
(2,070
)
 
32

 
16,019

 
(1,116
)
 
195

 
132,667

 
(3,186
)
Collateralized mortgage obligation: residential
7

 
14,762

 
(400
)
 
3

 
7,658

 
(270
)
 
10

 
22,420

 
(670
)
Mortgage-backed securities: residential
100

 
348,704

 
(8,550
)
 
49

 
113,184

 
(5,263
)
 
149

 
461,888

 
(13,813
)
Total investment securities available-for-sale
305

 
568,268

 
(12,371
)
 
87

 
144,124

 
(6,845
)
 
392

 
712,392

 
(19,216
)
Investment securities held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
2

 
1,111

 
—

 
—

 
—

 
—

 
2

 
1,111

 
—

Other
6

 
24,063

 
(585
)
 
1

 
5,953

 
(253
)
 
7

 
30,016

 
(838
)
Total investment securities held-to-maturity
8

 
25,174

 
(585
)
 
1

 
5,953

 
(253
)
 
9

 
31,127

 
(838
)
Total investment securities
313

 
$
593,442

 
$
(12,956
)
 
88

 
$
150,077

 
$
(7,098
)
 
401

 
$
743,519

 
$
(20,054
)

 
December 31, 2017
 
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)
Investment securities available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency
6

 
$
13,754

 
$
(78
)
 
—

 
$
—

 
$
—

 
6

 
$
13,754

 
$
(78
)
Corporate
4

 
10,079

 
(64
)
 
2

 
6,076

 
(130
)
 
6

 
16,155

 
(194
)
Municipal bonds
103

 
61,313

 
(268
)
 
30

 
15,658

 
(475
)
 
133

 
76,971

 
(743
)
Collateralized mortgage obligation: residential
5

 
13,971

 
(149
)
 
3

 
8,943

 
(186
)
 
8

 
22,914

 
(335
)
Mortgage-backed securities: residential
66

 
220,951

 
(1,600
)
 
41

 
110,062

 
(2,565
)
 
107

 
331,013

 
(4,165
)
Total investment securities available-for-sale
184

 
320,068

 
(2,159
)
 
76

 
140,739

 
(3,356
)
 
260

 
460,807

 
(5,515
)
Investment securities held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
2

 
10,745

 
(133
)
 
1

 
6,198

 
(76
)
 
3

 
16,943

 
(209
)
Total investment securities held-to-maturity
2

 
10,745

 
(133
)
 
1

 
6,198

 
(76
)
 
3

 
16,943

 
(209
)
Total investment securities
186

 
$
330,813

 
$
(2,292
)
 
77

 
$
146,937

 
$
(3,432
)
 
263

 
$
477,750

 
$
(5,724
)
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 at June 30, 2018, 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:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Agency
$
—

 
$
—

 
$
—

 
$
—

 
$
18,560

 
$
18,371

 
$
23,007

 
$
22,706

 
$
41,567

 
$
41,077

Corporate
—

 
—

 
—

 
—

 
93,126

 
92,502

 
—

 
—

 
93,126

 
92,502

Municipal bonds
3,806

 
3,807

 
36,076

 
36,038

 
68,094

 
66,741

 
113,830

 
113,315

 
221,806

 
219,901

Collateralized mortgage obligation: residential
—

 
—

 
—

 
—

 
934

 
936

 
28,813

 
28,222

 
29,747

 
29,158

Mortgage-backed securities: residential
—

 
—

 
2,066

 
2,002

 
119,439

 
117,063

 
384,312

 
372,997

 
505,817

 
492,062

Total investment securities available-for-sale
3,806

 
3,807

 
38,142

 
38,040

 
300,153

 
295,613

 
549,962

 
537,240

 
892,063

 
874,700

Investment securities held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
—

 
—

 
—

 
—

 
—

 
—

 
30,854

 
30,016

 
30,854

 
30,016

Other
—

 
—

 
—

 
—

 
—

 
—

 
1,111

 
1,111

 
1,111

 
1,111

Total investment securities held-to-maturity
—

 
—

 
—

 
—

 
—

 
—

 
31,965

 
31,127

 
31,965

 
31,127

Total investment securities
$
3,806

 
$
3,807

 
$
38,142

 
$
38,040

 
$
300,153

 
$
295,613

 
$
581,927

 
$
568,367

 
$
924,028

 
$
905,827