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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 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:
 
 
December 31, 2018
 
 
Amortized
Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
 
(dollars in thousands)
Investment securities available-for-sale:
 
 

 
 
 
 
 
 
U.S. Treasury
 
$
59,688

 
$
1,224

 
$
—

 
$
60,912

Agency
 
128,958

 
1,631

 
(519
)
 
130,070

Corporate debt
 
104,158

 
291

 
(906
)
 
103,543

Municipal bonds
 
238,914

 
1,941

 
(2,225
)
 
238,630

Collateralized mortgage obligation: residential
 
24,699

 
64

 
(425
)
 
24,338

Mortgage-backed securities: residential
 
554,751

 
1,112

 
(10,134
)
 
545,729

Total investment securities available-for-sale
 
1,111,168

 
6,263

 
(14,209
)
 
1,103,222

Investment securities held-to-maturity:
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
 
43,381

 
148

 
(686
)
 
42,843

Other
 
1,829

 
—

 
—

 
1,829

Total investment securities held-to-maturity
 
45,210

 
148

 
(686
)
 
44,672

Total investment securities
 
$
1,156,378

 
$
6,411

 
$
(14,895
)
 
$
1,147,894

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

 
 

 
 

 
 

Agency
 
$
47,051

 
$
236

 
$
(78
)
 
$
47,209

Corporate debt
 
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.
 
December 31, 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
15

 
26,229

 
(333
)
 
6

 
10,434

 
(186
)
 
21

 
36,663

 
(519
)
Corporate debt
9

 
47,805

 
(471
)
 
8

 
19,369

 
(435
)
 
17

 
67,174

 
(906
)
Municipal bonds
60

 
45,083

 
(369
)
 
102

 
69,693

 
(1,856
)
 
162

 
114,776

 
(2,225
)
Collateralized mortgage obligation: residential
1

 
814

 
(1
)
 
8

 
18,104

 
(424
)
 
9

 
18,918

 
(425
)
Mortgage-backed securities: residential
20

 
70,839

 
(435
)
 
120

 
324,864

 
(9,699
)
 
140

 
395,703

 
(10,134
)
Total investment securities available-for-sale
105

 
190,770

 
(1,609
)
 
244

 
442,464

 
(12,600
)
 
349

 
633,234

 
(14,209
)
Investment securities held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
3

 
11,256

 
(81
)
 
3

 
15,741

 
(605
)
 
6

 
26,997

 
(686
)
Other
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total investment securities held-to-maturity
3

 
11,256

 
(81
)
 
3

 
15,741

 
(605
)
 
6

 
26,997

 
(686
)
Total investment securities
108

 
$
202,026

 
$
(1,690
)
 
247

 
$
458,205

 
$
(13,205
)
 
355

 
$
660,231

 
$
(14,895
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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 debt
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 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
)
Other
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total held-to-maturity
2

 
10,745

 
(133
)
 
1

 
6,198

 
(76
)
 
3

 
16,943

 
(209
)
Total 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 available for sale at December 31, 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:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Treasury
 
$
—

 
$
—

 
$
10,407

 
$
10,606

 
$
49,281

 
$
50,306

 
$
—

 
$
—

 
$
59,688

 
$
60,912

Agency
 
992

 
991

 
35,103

 
35,769

 
74,149

 
74,926

 
18,714

 
18,384

 
128,958

 
130,070

Corporate
 
—

 
—

 
—

 
—

 
104,158

 
103,543

 
—

 
—

 
104,158

 
103,543

Municipal bonds
 
5,271

 
5,264

 
29,715

 
29,704

 
70,354

 
69,581

 
133,574

 
134,081

 
238,914

 
238,630

Collateralized mortgage obligation: residential
 
—

 
—

 
—

 
—

 
815

 
814

 
23,884

 
23,524

 
24,699

 
24,338

Mortgage-backed securities: residential
 
—

 
—

 
1,569

 
1,527

 
162,855

 
161,964

 
390,327

 
382,238

 
554,751

 
545,729

Total investment securities available-for-sale
 
6,263

 
6,255

 
76,794

 
77,606

 
461,612

 
461,134

 
566,499

 
558,227

 
1,111,168

 
1,103,222

Investment securities held-to-maturity:
 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

 
 

Mortgage-backed securities: residential
 
—

 
—

 
928

 
942

 
—

 
—

 
42,453

 
41,901

 
43,381

 
42,843

Other
 
—

 
—

 
—

 
—

 
—

 
—

 
1,829

 
1,829

 
1,829

 
1,829

Total investment securities held-to-maturity
 
—

 
—

 
928

 
942

 
—

 
—

 
44,282

 
43,730

 
45,210

 
44,672

Total investment securities
 
$
6,263

 
$
6,255

 
$
77,722

 
$
78,548

 
$
461,612

 
$
461,134

 
$
610,781

 
$
601,957

 
$
1,156,378

 
$
1,147,894