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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2019
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:
 
 
March 31, 2019
 
 
Amortized
 Cost
 
Unrealized
Gain
 
Unrealized
Loss
 
Estimated
Fair Value
 
 
(dollars in thousands)
Investment securities available-for-sale:
 
 

 
 
 
 
 
 
U.S. Treasury
 
$
59,716

 
$
2,185

 
$
—

 
$
61,901

Agency
 
161,945

 
3,987

 
(444
)
 
165,488

Corporate
 
138,128

 
538

 
(811
)
 
137,855

Municipal bonds
 
213,561

 
4,122

 
(667
)
 
217,016

Collateralized mortgage obligation: residential
 
23,642

 
70

 
(261
)
 
23,451

Mortgage-backed securities: residential
 
567,348

 
3,669

 
(5,318
)
 
565,699

Total investment securities available-for-sale
 
1,164,340

 
14,571

 
(7,501
)
 
1,171,410

Investment securities held-to-maturity:
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
 
42,083

 
466

 
(380
)
 
42,169

Other
 
1,811

 
—

 
—

 
1,811

Total investment securities held-to-maturity
 
43,894

 
466

 
(380
)
 
43,980

Total investment securities
 
$
1,208,234

 
$
15,037

 
$
(7,881
)
 
$
1,215,390


 
 
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
 
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
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.
 
March 31, 2019
 
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

 
$
27,200

 
$
(189
)
 
8

 
$
14,583

 
$
(255
)
 
14

 
$
41,783

 
$
(444
)
Corporate
9

 
51,516

 
(363
)
 
10

 
28,837

 
(448
)
 
19

 
80,353

 
(811
)
Municipal bonds
4

 
12,087

 
(18
)
 
58

 
39,763

 
(649
)
 
62

 
51,850

 
(667
)
Collateralized mortgage obligation: residential
1

 
758

 
(1
)
 
8

 
17,433

 
(260
)
 
9

 
18,191

 
(261
)
Mortgage-backed securities: residential
2

 
21,784

 
(415
)
 
106

 
291,110

 
(4,903
)
 
108

 
312,894

 
(5,318
)
Total investment securities available-for-sale
22

 
113,345

 
(986
)
 
190

 
391,726

 
(6,515
)
 
212

 
505,071

 
(7,501
)
Investment securities held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities: residential
—

 
—

 
—

 
4

 
17,131

 
(380
)
 
4

 
17,131

 
(380
)
Total investment securities held-to-maturity
—

 
—

 
—

 
4

 
17,131

 
(380
)
 
4

 
17,131

 
(380
)
Total investment securities
22

 
$
113,345

 
$
(986
)
 
194

 
$
408,857

 
$
(6,895
)
 
216

 
$
522,202

 
$
(7,881
)

 
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
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
)
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
)
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 March 31, 2019, 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:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
495

 
$
495

 
$
9,917

 
$
10,214

 
$
49,304

 
$
51,192

 
$
—

 
$
—

 
$
59,716

 
$
61,901

Agency
—

 
—

 
32,098

 
33,108

 
84,589

 
87,279

 
45,258

 
45,101

 
161,945

 
165,488

Corporate
—

 
—

 
—

 
—

 
138,128

 
137,855

 
—

 
—

 
138,128

 
137,855

Municipal bonds
250

 
250

 
2,186

 
2,202

 
40,705

 
40,946

 
170,420

 
173,618

 
213,561

 
217,016

Collateralized mortgage obligation: residential
—

 
—

 
—

 
—

 
2,957

 
2,916

 
20,685

 
20,535

 
23,642

 
23,451

Mortgage-backed securities: residential
—

 
—

 
479

 
471

 
136,950

 
137,977

 
429,919

 
427,251

 
567,348

 
565,699

Total investment securities available-for-sale
745

 
745

 
44,680

 
45,995

 
452,633

 
458,165

 
666,282

 
666,505

 
1,164,340

 
1,171,410

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

 
—

 
923

 
947

 
—

 
—

 
41,160

 
41,222

 
42,083

 
42,169

Other
—

 
—

 
—

 
—

 
—

 
—

 
1,811

 
1,811

 
1,811

 
1,811

Total investment securities held-to-maturity
—

 
—

 
923

 
947

 
—

 
—

 
42,971

 
43,033

 
43,894

 
43,980

Total investment securities
$
745

 
$
745

 
$
45,603

 
$
46,942

 
$
452,633

 
$
458,165

 
$
709,253

 
$
709,538

 
$
1,208,234

 
$
1,215,390