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SECURITIES (Tables)
 3 Months Ended
Mar. 31, 2018
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:
 
 
March 31, 2018
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
 
 
(Dollars in thousands)
Available-for-sale:
 
 
 
 
 
 
 
 
SBA guaranteed securities
 
$
101,415

 
$
95

 
$
(1,567
)
 
$
99,943

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
 
259,767

 
360

 
(5,539
)
 
254,588

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: commercial
 
65,920

 
—

 
(1,371
)
 
64,549

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
 
203,156

 
20

 
(6,292
)
 
196,884

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: commercial
 
36,068

 
—

 
(1,049
)
 
35,019

Corporate debt securities
 
12,790

 
35

 
—

 
12,825

Obligations of municipal subdivisions
 
236

 
1

 
—

 
237

Total
 
$
679,352

 
$
511

 
$
(15,818
)
 
$
664,045

 
 
 
 
 
 
 
 
 
Held-to-maturity:
 
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
 
$
10,679

 
$
44

 
$
(335
)
 
$
10,388

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: commercial
 
2,488

 
—

 
—

 
2,488

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
 
45,735

 
209

 
(28
)
 
45,916

Obligations of municipal subdivisions
 
6,199

 
46

 
—

 
6,245

Total
 
$
65,101

 
$
299

 
$
(363
)
 
$
65,037

 
Securities with fair value of $50.0 million were transferred from available-for-sale to held-to-maturity classification during the quarter ended March 31, 2018. The related unrealized loss of $2.2 million remained in accumulated other comprehensive income and will be amortized over the remaining term of the securities.
 
 
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
Schedule of contractual maturities of securities
The following table sets forth, as of the date indicated, contractual maturities of securities:
 
 
March 31, 2018
 
 
Available-for-sale
 
Held-to-maturity
 
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
 
 
(Dollars in thousands)
Due in one year or less
 
$
1,790

 
$
1,790

 
$
—

 
$
—

Due after one year through five years
 
—

 
—

 
—

 
—

Due after five years through ten years
 
4,236

 
4,237

 
—

 
—

Due after ten years
 
7,000

 
7,035

 
6,199

 
6,245

 
 
13,026

 
13,062

 
6,199

 
6,245

 
 
 
 
 
 
 
 
 
Mortgage-backed securities and collateralized mortgage obligations
 
564,911

 
551,040

 
58,902

 
58,792

SBA guaranteed securities
 
101,415

 
99,943

 
—

 
—

Total
 
$
679,352

 
$
664,045

 
$
65,101

 
$
65,037
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:
 
 
March 31, 2018
 
 
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
 
$
80,381

 
$
(1,567
)
 
$
78,814

 
$
—

 
$
—

 
$
—

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
 
232,454

 
(5,489
)
 
226,965

 
3,814

 
(50
)
 
3,764

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: commercial
 
65,920

 
(1,371
)
 
64,549

 
—

 
—

 
—

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
 
92,664

 
(2,436
)
 
90,228

 
105,538

 
(3,856
)
 
101,682

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: commercial
 
36,068

 
(1,049
)
 
35,019

 
—

 
—

 
—

Total
 
$
507,487

 
$
(11,912
)
 
$
495,575

 
$
109,352

 
$
(3,906
)
 
$
105,446

 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
 
$
2,777

 
$
(45
)
 
$
2,732

 
$
6,221

 
$
(290
)
 
$
5,931

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
 
2,284

 
(28
)
 
2,256

 
—

 
—

 
—

Total
 
$
5,061

 
$
(73
)
 
$
4,988

 
$
6,221

 
$
(290
)
 
$
5,931


 
 
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