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Securities (Tables)
 3 Months Ended
Mar. 31, 2018
Gain (Loss) on Investments [Line Items]  
Reconciliation of fair value of securities
The following table presents a summary of the amortized cost, gross unrealized gains and losses and fair value of securities available for sale and securities held to maturity for the periods indicated:
 
March 31, 2018
 
December 31, 2017
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair
Value
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross Unrealized
Losses
 
Fair
Value
 
(Dollars in thousands)
Available for sale securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency securities
$
35,478

 
$
—

 
$
(535
)
 
$
34,943

 
$
35,475

 
$
86

 
$
(131
)
 
$
35,430

Agency mortgage-backed securities
226,111

 
1,266

 
(4,166
)
 
223,211

 
214,934

 
1,897

 
(1,067
)
 
215,764

Agency collateralized mortgage obligations
139,433

 
73

 
(4,314
)
 
135,192

 
124,098

 
78

 
(2,164
)
 
122,012

State, county, and municipal securities
2,232

 
22

 
—

 
2,254

 
2,237

 
37

 
—

 
2,274

Single issuer trust preferred securities issued by banks
2,002

 
3

 
—

 
2,005

 
2,012

 
4

 
—

 
2,016

Pooled trust preferred securities issued by banks and insurers
2,173

 
—

 
(518
)
 
1,655

 
2,179

 
—

 
(539
)
 
1,640

Small business administration pooled securities
47,434

 
—

 
(944
)
 
46,490

 
47,852

 
44

 
(118
)
 
47,778

Equity securities
—

 
—

 
—

 
—

 
19,432

 
1,594

 
(442
)
 
20,584

Total available for sale securities
$
454,863

 
$
1,364

 
$
(10,477
)
 
$
445,750

 
$
448,219

 
$
3,740

 
$
(4,461
)
 
$
447,498

Held to maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
1,005

 
$
16

 
$
—

 
$
1,021

 
$
1,006

 
$
29

 
$
—

 
$
1,035

Agency mortgage-backed securities
192,961

 
474

 
(3,026
)
 
190,409

 
204,768

 
1,791

 
(736
)
 
205,823

Agency collateralized mortgage obligations
306,395

 
126

 
(8,703
)
 
297,818

 
262,998

 
397

 
(4,987
)
 
258,408

Single issuer trust preferred securities issued by banks
1,500

 
21

 
—

 
1,521

 
1,500

 
29

 
—

 
1,529

Small business administration pooled securities
27,000

 
95

 
(309
)
 
26,786

 
27,416

 
183

 
(200
)
 
27,399

Total held to maturity securities
$
528,861

 
$
732

 
$
(12,038
)
 
$
517,555

 
$
497,688

 
$
2,429

 
$
(5,923
)
 
$
494,194

Total
$
983,724

 
$
2,096

 
$
(22,515
)
 
$
963,305

 
$
945,907

 
$
6,169

 
$
(10,384
)
 
$
941,692
Schedule of contractual maturities of securities
A schedule of the contractual maturities of securities available for sale and securities held to maturity as of March 31, 2018 is presented below:

 
Due in one year or less
 
Due after one year to five years
 
Due after five to ten years
 
Due after 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 securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government agency securities
$
2,997

 
$
2,995

 
$
20,016

 
$
19,860

 
$
12,465

 
$
12,088

 
$
—

 
$
—

 
$
35,478

 
$
34,943

Agency mortgage-backed securities
84

 
85

 
43,016

 
42,235

 
97,629

 
96,201

 
85,382

 
84,690

 
226,111

 
223,211

Agency collateralized mortgage obligations
8

 
8

 
—

 
—

 
—

 
—

 
139,425

 
135,184

 
139,433

 
135,192

State, county, and municipal securities
—

 
—

 
1,026

 
1,028

 
1,206

 
1,226

 
—

 
—

 
2,232

 
2,254

Single issuer trust preferred securities issued by banks
—

 
—

 
—

 
—

 
—

 
—

 
2,002

 
2,005

 
2,002

 
2,005

Pooled trust preferred securities issued by banks and insurers
—

 
—

 
—

 
—

 
—

 
—

 
2,173

 
1,655

 
2,173

 
1,655

Small business administration pooled securities
—

 
—

 
—

 
—

 
—

 
—

 
47,434

 
46,490

 
47,434

 
46,490

Total available for sale securities
$
3,089

 
$
3,088

 
$
64,058

 
$
63,123

 
$
111,300

 
$
109,515

 
$
276,416

 
$
270,024

 
$
454,863

 
$
445,750

Held to maturity securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury securities
$
—

 
$
—

 
$
1,005

 
$
1,021

 
$
—

 
$
—

 
$
—

 
$
—

 
$
1,005

 
$
1,021

Agency mortgage-backed securities
—

 
—

 
9,052

 
8,932

 
14,057

 
14,146

 
169,852

 
167,331

 
192,961

 
190,409

Agency collateralized mortgage obligations
—

 
—

 
—

 
—

 
1,426

 
1,423

 
304,969

 
296,395

 
306,395

 
297,818

Single issuer trust preferred securities issued by banks
—

 
—

 
—

 
—

 
—

 
—

 
1,500

 
1,521

 
1,500

 
1,521

Small business administration pooled securities
—

 
—

 
—

 
—

 
—

 
—

 
27,000

 
26,786

 
27,000

 
26,786

Total held to maturity securities
$
—

 
$
—

 
$
10,057

 
$
9,953

 
$
15,483

 
$
15,569

 
$
503,321

 
$
492,033

 
$
528,861

 
$
517,555
Schedule of gross unrealized losses and fair value of investments
The following tables show the gross unrealized losses and fair value of the Company’s investments in an unrealized loss position, which the Company has not deemed to be OTTI, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position:
 
March 31, 2018
 
 
 
Less than 12 months
 
12 months or longer
 
Total
 
# of holdings
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(Dollars in thousands)
U.S. government agency securities
6

 
$
34,943

 
$
(535
)
 
$
—

 
$
—

 
$
34,943

 
$
(535
)
Agency mortgage-backed securities
140

 
338,326

 
(6,624
)
 
14,205

 
(568
)
 
352,531

 
(7,192
)
Agency collateralized mortgage obligations
51

 
244,572

 
(5,384
)
 
150,834

 
(7,633
)
 
395,406

 
(13,017
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,655

 
(518
)
 
1,655

 
(518
)
Small business administration pooled securities
6

 
56,839

 
(1,074
)
 
9,569

 
(179
)
 
66,408

 
(1,253
)
Total temporarily impaired securities
204

 
$
674,680

 
$
(13,617
)
 
$
176,263

 
$
(8,898
)
 
$
850,943

 
$
(22,515
)

 
December 31, 2017
 
 
 
Less than 12 months
 
12 months or longer
 
Total
 
# of holdings
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
(Dollars in thousands)
U.S.government agency securities
4

 
$
24,343

 
$
(131
)
 
$
—

 
$
—

 
$
24,343

 
$
(131
)
Agency mortgage-backed securities
84

 
235,411

 
(1,493
)
 
14,886

 
(310
)
 
250,297

 
(1,803
)
Agency collateralized mortgage obligations
42

 
178,142

 
(1,579
)
 
159,506

 
(5,572
)
 
337,648

 
(7,151
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,640

 
(539
)
 
1,640

 
(539
)
Small business administration pooled securities
4

 
34,553

 
(223
)
 
9,647

 
(95
)
 
44,200

 
(318
)
Equity securities
28

 
3,290

 
(39
)
 
7,619

 
(403
)
 
10,909

 
(442
)
Total temporarily impaired securities
163

 
$
475,739

 
$
(3,465
)
 
$
193,298

 
$
(6,919
)
 
$
669,037

 
$
(10,384
)