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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2017
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, 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

 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
Amortized
 
Unrealized
 
Unrealized
 
Estimated
 
 
Cost
 
Gain
 
Loss
 
Fair Value
 
 
(dollars in thousands)
Investment securities available-for-sale
 
 

 
 

 
 

 
 

Corporate
 
$
37,475

 
$
372

 
$
(205
)
 
$
37,642

Municipal bonds
 
120,155

 
338

 
(1,690
)
 
118,803

Collateralized mortgage obligation: residential
 
31,536

 
25

 
(173
)
 
31,388

Mortgage-backed securities: residential
 
196,496

 
69

 
(3,435
)
 
193,130

Total investment securities available-for-sale
 
385,662

 
804

 
(5,503
)
 
380,963

Investment securities held-to-maturity
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
 
7,375

 
—

 
(104
)
 
7,271

Other
 
1,190

 
—

 
—

 
1,190

Total investment securities held-to-maturity
 
8,565

 
—

 
(104
)
 
8,461

Total investment securities
 
$
394,227

 
$
804

 
$
(5,607
)
 
$
389,424
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, 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
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
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
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Corporate
3

 
$
7,609

 
$
(205
)
 
—

 
$
—

 
$
—

 
3

 
$
7,609

 
$
(205
)
Municipal bonds
152

 
85,750

 
(1,690
)
 
—

 
—

 
—

 
152

 
85,750

 
(1,690
)
Collateralized mortgage obligation: residential
5

 
19,092

 
(173
)
 
—

 
—

 
—

 
5

 
19,092

 
(173
)
Mortgage-backed securities: residential
55

 
149,740

 
(2,916
)
 
4

 
16,039

 
(519
)
 
59

 
165,779

 
(3,435
)
Total available-for-sale
215

 
262,191

 
(4,984
)
 
4

 
16,039

 
(519
)
 
219

 
278,230

 
(5,503
)
Investment securities held-to-maturity
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
1

 
7,271

 
(104
)
 
—

 
—

 
—

 
1

 
7,271

 
(104
)
Total held-to-maturity
1

 
7,271

 
(104
)
 
—

 
—

 
—

 
1

 
7,271

 
(104
)
Total securities
216

 
$
269,462

 
$
(5,088
)
 
4

 
$
16,039

 
$
(519
)
 
220

 
$
285,501

 
$
(5,607
)
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, 2017, 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
 
$
—

 
$
—

 
$
—

 
$
—

 
$
15,156

 
$
15,164

 
$
31,895

 
$
32,045

 
$
47,051

 
$
47,209

Corporate
 
—

 
—

 
—

 
—

 
78,155

 
79,546

 
—

 
—

 
78,155

 
79,546

Municipal bonds
 
4,124

 
4,121

 
32,390

 
32,424

 
72,845

 
73,312

 
119,570

 
122,271

 
228,929

 
232,128

Collateralized mortgage obligation: residential
 
—

 
—

 
—

 
—

 
1,069

 
1,071

 
32,915

 
32,710

 
33,984

 
33,781

Mortgage-backed securities: residential
 
2,591

 
2,583

 
2,647

 
2,611

 
65,541

 
65,014

 
327,885

 
324,557

 
398,664

 
394,765

Total investment securities available-for-sale
 
6,715

 
6,704

 
35,037

 
35,035

 
232,766

 
234,107

 
512,265

 
511,583

 
786,783

 
787,429

Investment securities held-to-maturity
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Mortgage-backed securities: residential
 
—

 
—

 
—

 
—

 
—

 
—

 
17,153

 
16,944

 
17,153

 
16,944

Other
 
—

 
—

 
—

 
—

 
—

 
—

 
1,138

 
1,138

 
1,138

 
1,138

Total investment securities held-to-maturity
 
—

 
—

 
—

 
—

 
—

 
—

 
18,291

 
18,082

 
18,291

 
18,082

Total investment securities
 
$
6,715

 
$
6,704

 
$
35,037

 
$
35,035

 
$
232,766

 
$
234,107

 
$
530,556

 
$
529,665

 
$
805,074

 
$
805,511