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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-sale Securities and Held-to-maturity Securities
The following table presents a summary of the amortized cost, gross unrealized holding gains and losses and fair value of securities available for sale and securities held to maturity for the periods indicated:
 
December 31, 2017
 
December 31, 2016
 
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
$
35,475

$
86

$
(131
)
$
35,430

 
$
24,006

$
238

$
—

$
24,244

Agency mortgage-backed securities
214,934

1,897

(1,067
)
215,764

 
173,268

2,852

(736
)
175,384

Agency collateralized mortgage obligations
124,098

78

(2,164
)
122,012

 
101,094

106

(1,332
)
99,868

State, county, and municipal securities
2,237

37

—

2,274

 
3,743

50

—

3,793

Single issuer trust preferred securities issued by banks
2,012

4

—

2,016

 
2,311

3

(3
)
2,311

Pooled trust preferred securities issued by banks and insurers
2,179

—

(539
)
1,640

 
2,200

—

(616
)
1,584

Small business administration pooled securities
47,852

44

(118
)
47,778

 
37,561

—

(372
)
37,189

Equity securities
19,432

1,594

(442
)
20,584

 
19,183

641

(553
)
19,271

Total available for sale securities
448,219

3,740

(4,461
)
447,498

 
363,366

3,890

(3,612
)
363,644

Held to maturity securities
 
 
 
 
 
 
 
 
 
U.S. treasury securities
1,006

29

—

1,035

 
1,007

47

—

1,054

Agency mortgage-backed securities
204,768

1,791

(736
)
205,823

 
156,088

2,274

(858
)
157,504

Agency collateralized mortgage obligations
262,998

397

(4,987
)
258,408

 
297,445

1,002

(3,797
)
294,650

Single issuer trust preferred securities issued by banks
1,500

29

—

1,529

 
1,500

44

—

1,544

Small business administration pooled securities
27,416

183

(200
)
27,399

 
31,036

189

(327
)
30,898

Total held to maturity securities
497,688

2,429

(5,923
)
494,194

 
487,076

3,556

(4,982
)
485,650

Total
$
945,907

$
6,169

$
(10,384
)
$
941,692

 
$
850,442

$
7,446

$
(8,594
)
$
849,294
Schedule of Contractual Maturities of Securities
A schedule of the contractual maturities of securities available for sale and securities held to maturity as of December 31, 2017 is presented below:
 
Available for Sale
 
Held to Maturity
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
 
(Dollars in thousands)
Due in one year or less
$
3,213

 
$
3,215

 
$
—

 
$
—

Due after one year to five years
49,241

 
49,312

 
15,636

 
15,711

Due after five to ten years
107,417

 
107,402

 
16,801

 
17,098

Due after ten years
268,916

 
266,985

 
465,251

 
461,385

Total debt securities
428,787

 
426,914

 
497,688

 
494,194

Equity securities
19,432

 
20,584

 
—

 
—

Total
$
448,219


$
447,498

 
$
497,688

 
$
494,194
Schedule of Gross Unrealized Losses and Fair Value of Investments
 
 
 
December 31, 2017
 
 
 
Less than 12 months
 
12 months or longer
 
Total
Description of securities
# 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
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
Less than 12 months
 
12 months or longer
 
Total
Description of securities
# of
holdings
 
Fair Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair Value
 
Unrealized
Losses
 
 
 
(Dollars in thousands)
Agency mortgage-backed securities
57

 
$
137,949

 
$
(1,594
)
 
$
—

 
$
—

 
$
137,949

 
$
(1,594
)
Agency collateralized mortgage obligations
32

 
243,051

 
(3,140
)
 
47,403

 
(1,989
)
 
290,454

 
(5,129
)
Single issuer trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,036

 
(3
)
 
1,036

 
(3
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,583

 
(616
)
 
1,583

 
(616
)
Small business administration pooled securities
5

 
59,846

 
(699
)
 
—

 
—

 
59,846

 
(699
)
Equity securities
25

 
3,625

 
(77
)
 
6,334

 
(476
)
 
9,959

 
(553
)
Total temporarily impaired securities
121

 
$
444,471

 
$
(5,510
)
 
$
56,356

 
$
(3,084
)
 
$
500,827

 
$
(8,594
)