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SECURITIES (Tables)
 9 Months Ended
Sep. 30, 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:
 
 
September 30, 2018
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
 
 
(Dollars in thousands)
Available-for-sale:
 
 
 
 
 
 
 
 
SBA guaranteed securities
 
$
95,638

 
$
13

 
$
(2,296
)
 
$
93,355

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
 
219,222

 
—

 
(8,852
)
 
210,370

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: commercial
 
54,792

 
—

 
(2,955
)
 
51,837

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
 
212,400

 
—

 
(8,005
)
 
204,395

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: commercial
 
35,910

 
—

 
(1,466
)
 
34,444

Corporate debt securities
 
15,917

 
17

 
(77
)
 
15,857

Obligations of municipal subdivisions
 
236

 
—

 
—

 
236

Total
 
$
634,115

 
$
30

 
$
(23,651
)
 
$
610,494

 
 
 
 
 
 
 
 
 
Held-to-maturity:
 
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
 
$
10,794

 
$
15

 
$
(483
)
 
$
10,326

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

 
—

 
(142
)
 
2,346

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
 
43,130

 
81

 
(289
)
 
42,922

Obligations of municipal subdivisions
 
6,183

 
—

 
(110
)
 
6,073

Total
 
$
62,595

 
$
96

 
$
(1,024
)
 
$
61,667

 
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 at the date of transfer of $2.2 million remained in accumulated other comprehensive income and will be amortized over the remaining term of the securities. The net unamortized, unrealized loss on the transferred securities included in accumulated other comprehensive income as of September 30, 2018 totaled $2.0 million.

 
 
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:
 
 
September 30, 2018
 
 
Available-for-sale
 
Held-to-maturity
 
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
 
 
(Dollars in thousands)
Due in one year or less
 
$
—

 
$
—

 
$
—

 
$
—

Due after one year through five years
 
4,917

 
4,867

 
—

 
—

Due after five years through ten years
 
11,236

 
11,226

 
—

 
—

Due after ten years
 
—

 
—

 
6,183

 
6,073

 
 
16,153

 
16,093

 
6,183

 
6,073

 
 
 
 
 
 
 
 
 
Mortgage-backed securities and collateralized mortgage obligations
 
522,324

 
501,046

 
56,412

 
55,594

SBA guaranteed securities
 
95,638

 
93,355

 
—

 
—

Total
 
$
634,115

 
$
610,494

 
$
62,595

 
$
61,667
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:
 
 
September 30, 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
 
$
32,936

 
$
(351
)
 
$
32,585

 
$
58,385

 
$
(1,945
)
 
$
56,440

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
 
131,434

 
(4,956
)
 
126,478

 
87,788

 
(3,896
)
 
83,892

Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: commercial
 
32,888

 
(1,848
)
 
31,040

 
21,904

 
(1,107
)
 
20,797

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
 
59,079

 
(1,366
)
 
57,713

 
144,981

 
(6,639
)
 
138,342

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: commercial
 
4,971

 
(223
)
 
4,748

 
30,940

 
(1,243
)
 
29,697

Corporate debt securities
 
8,917

 
(77
)
 
8,840

 
—

 
—

 
—

Total
 
$
270,225

 
$
(8,821
)
 
$
261,404

 
$
343,998

 
$
(14,830
)
 
$
329,168

 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies or sponsored enterprises: residential
 
$
2,657

 
$
(74
)
 
$
2,583

 
$
6,869

 
$
(409
)
 
$
6,460

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

 
(142
)
 
2,346

 
—

 
—

 
—

Collateralized mortgage obligations issued by U.S. government agencies or sponsored enterprises: residential
 
24,321

 
(233
)
 
24,088

 
1,977

 
(56
)
 
1,921

Municipal bonds
 
6,183

 
(110
)
 
6,073

 
—

 
—

 
—

Total
 
$
35,649

 
$
(559
)
 
$
35,090

 
$
8,846

 
$
(465
)
 
$
8,381


 
 
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