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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost and fair value of securities
The amortized cost and fair value of securities as of the dates set forth were as follows:
 
December 31, 2017
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
 
 
 
 
 
 
 
 
 
(Dollars in thousands)
Available-for-sale:
 
 
 
 
 
 
 
SBA guaranteed securities
$
104,111

 
$
129

 
$
(948
)
 
$
103,292

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
250,580

 
$
297

 
(1,701
)
 
249,176

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: commercial

$
65,986

 
$
—

 
$
(500
)
 
$
65,486

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
234,881

 
—

 
(6,434
)
 
228,447

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: commercial
36,151

 
—

 
(472
)
 
35,679

Corporate debt securities
5,789

 
5

 
—

 
5,794

Obligations of municipal subdivisions
6,672

 
—

 
(45
)
 
6,627

CRA qualified investment fund
11,337

 
—

 
(299
)
 
11,038

Total
$
715,507

 
$
431

 
$
(10,399
)
 
$
705,539

 
 
 
 
 
 
 
 
Held-to-maturity:
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
$
10,841

 
$
61

 
$
(170
)
 
$
10,732

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
2,434

 
—

 
(20
)
 
2,414

Total
$
13,275

 
$
61

 
$
(190
)
 
$
13,146


 
December 31, 2016
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
 
 
 
 
 
 
 
 
 
(Dollars in thousands)
Available-for-sale:
 
 
 
 
 
 
 
Obligations of the U.S. Treasury and other U.S. government agencies or sponsored enterprises
$
118,272

 
$
17

 
$
(403
)
 
$
117,886

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
99,876

 
452

 
(430
)
 
99,898

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
42,379

 
96

 
(563
)
 
41,912

Corporate debt securities
3,788

 
1

 
(14
)
 
3,775

Obligations of municipal subdivisions
236

 
—

 
(1
)
 
235

CRA qualified investment fund
11,183

 
—

 
(270
)
 
10,913

Total
$
275,734

 
$
566

 
$
(1,681
)
 
$
274,619

 
 
 
 
 
 
 
 
Held-to-maturity:
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
$
14,358

 
$
140

 
$
(267
)
 
$
14,231

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
21,147

 
2

 
(536
)
 
20,613

Total
$
35,505

 
$
142

 
$
(803
)
 
$
34,844
Schedule of contractual maturities of securities
The following table sets forth, as of the date indicated, contractual maturities of securities:
 
December 31, 2017
 
Available-for-sale
 
Held-to-maturity
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
 
 
 
 
 
 
 
 
 
(Dollars in thousands)
Due in one year or less
$
1,789

 
$
1,794

 
$
—

 
$
—

Due after one year through five years
—

 
—

 
—

 
—

Due after five years through ten years
4,236

 
4,236

 
—

 
—

Due after ten years
6,436

 
6,390

 
—

 
—

 
12,461

 
12,420

 
—

 
—

 
 
 
 
 
 
 
 
Mortgage-backed securities and collateralized mortgage obligations
587,598

 
578,789

 
13,275

 
13,146

SBA guaranteed securities
104,111

 
103,292

 
—

 
—

CRA qualified investment fund
11,337

 
11,038

 
—

 
—

Total
$
715,507

 
$
705,539

 
$
13,275

 
$
13,146
Schedule of investments in a continuous unrealized loss position
Securities with unrealized losses segregated by length of continuous unrealized loss position as of the dates set forth were as follows:
 
December 31, 2017
 
Less than 12 Months
 
12 Months or More
 
Amortized Cost
 
Gross Unrealized Losses
 
Fair Value
 
Amortized Cost
 
Gross Unrealized Losses
 
Fair Value
 
 
 
 
 
 
 
 
 
 
 
 
 
(Dollars in thousands)
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
SBA guaranteed securities
$
76,603

 
$
(948
)
 
$
75,655

 
$
—

 
$
—

 
$
—

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
192,105

 
(1,608
)
 
190,497

 
9,152

 
(93
)
 
9,059

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: commercial

65,986

 
(500
)
 
65,486

 
—

 
—

 
—

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
210,034

 
(6,183
)
 
203,851

 
9,037

 
(251
)
 
8,786

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: commercial
36,151

 
(472
)
 
35,679

 
—

 
—

 
—

Obligations of municipal subdivisions
6,436

 
(45
)
 
6,391

 
—

 
—

 
 
CRA qualified investment fund
—

 
—

 
—

 
11,337

 
(299
)
 
11,038

Total
$
587,315

 
$
(9,756
)
 
$
577,559

 
$
29,526

 
$
(643
)
 
$
28,883

 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
$
1,086

 
$
(9
)
 
$
1,077

 
$
6,265

 
$
(161
)
 
$
6,104

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
2,434

 
(20
)
 
2,414

 
—

 
—

 
—

Total
$
3,520

 
$
(29
)
 
$
3,491

 
$
6,265

 
$
(161
)
 
$
6,104

 
 
December 31, 2016
 
Less than 12 Months
 
12 Months or More
 
Amortized Cost
 
Gross Unrealized Losses
 
Fair Value
 
Amortized Cost
 
Gross Unrealized Losses
 
Fair Value
 
 
 
 
 
 
 
 
 
 
 
 
 
(Dollars in thousands)
Available-for-sale:
 
 
 
 
 
 
    
 
 
 
            
Obligations of the U.S. Treasury and other U.S. government agencies or sponsored enterprises
$
100,517

 
$
(403
)
 
$
100,114

 
$
—

 
$
—

 
$
—

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
60,233

 
(405
)
 
59,828

 
4,121

 
(25
)
 
4,096

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
29,916

 
(492
)
 
29,424

 
2,874

 
(71
)
 
2,803

Corporate debt securities
1,785

 
(14
)
 
1,771

 
—

 
—

 
—

Obligations of municipal subdivisions
236

 
(1
)
 
235

 
—

 
—

 
—

CRA qualified investment fund
11,183

 
(270
)
 
10,913

 
—

 
—

 
—

Total
$
203,870

 
$
(1,585
)
 
$
202,285

 
$
6,995

 
$
(96
)
 
$
6,899

 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
$
8,551

 
$
(234
)
 
$
8,317

 
$
860

 
$
(33
)
 
$
827

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
12,141

 
(191
)
 
11,950

 
7,644

 
(345
)
 
7,299

Total
$
20,692

 
$
(425
)
 
$
20,267

 
$
8,504

 
$
(378
)
 
$
8,126