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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of Equity securities gains and losses [Table Text Block] The following table represents a summary of the gains and losses that relates to equity securities for the periods indicated:
 
Years Ended December 31
 
2018
 
2017
 
2016
Net losses recognized during the period on equity securities
$
(1,225
)
 
n/a
 
n/a
Less: net gains recognized during the period on equity securities sold during the period
874

 
n/a
 
n/a
Unrealized losses recognized during the reporting period on equity securities still held at the reporting date
$
(2,099
)
 
n/a
 
n/a
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, 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
$
32,477

$
—

$
(439
)
$
32,038

 
$
35,475

$
86

$
(131
)
$
35,430

Agency mortgage-backed securities
222,491

1,020

(3,406
)
220,105

 
214,934

1,897

(1,067
)
215,764

Agency collateralized mortgage obligations
138,149

197

(3,435
)
134,911

 
124,098

78

(2,164
)
122,012

State, county, and municipal securities
1,719

16

—

1,735

 
2,237

37

—

2,274

Single issuer trust preferred securities issued by banks
717

—

(10
)
707

 
2,012

4

—

2,016

Pooled trust preferred securities issued by banks and insurers
1,678

—

(349
)
1,329

 
2,179

—

(539
)
1,640

Small business administration pooled securities
53,317

—

(1,390
)
51,927

 
47,852

44

(118
)
47,778

Equity securities
—

—

—

—

 
19,432

1,594

(442
)
20,584

Total available for sale securities
450,548

1,233

(9,029
)
442,752

 
448,219

3,740

(4,461
)
447,498

Held to maturity securities
 
 
 
 
 
 
 
 
 
U.S. treasury securities
1,004

11

—

1,015

 
1,006

29

—

1,035

Agency mortgage-backed securities
252,484

1,548

(3,104
)
250,928

 
204,768

1,791

(736
)
205,823

Agency collateralized mortgage obligations
332,775

869

(6,920
)
326,724

 
262,998

397

(4,987
)
258,408

Single issuer trust preferred securities issued by banks
1,500

—

(10
)
1,490

 
1,500

29

—

1,529

Small business administration pooled securities
23,727

105

(349
)
23,483

 
27,416

183

(200
)
27,399

Total held to maturity securities
611,490

2,533

(10,383
)
603,640

 
497,688

2,429

(5,923
)
494,194

Total
$
1,062,038

$
3,766

$
(19,412
)
$
1,046,392

 
$
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 December 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
$
—

 
$
—

 
$
20,010

 
$
19,903

 
$
12,467

 
$
12,135

 
$
—

 
$
—

 
$
32,477

 
$
32,038

Agency mortgage-backed securities
89

 
90

 
52,452

 
51,761

 
89,408

 
88,402

 
80,542

 
79,852

 
222,491

 
220,105

Agency collateralized mortgage obligations
—

 
—

 
—

 
—

 
—

 
—

 
138,149

 
134,911

 
138,149

 
134,911

State, county, and municipal securities
—

 
—

 
770

 
771

 
949

 
964

 
—

 
—

 
1,719

 
1,735

Single issuer trust preferred securities issued by banks
—

 
—

 
—

 
—

 
—

 
—

 
717

 
707

 
717

 
707

Pooled trust preferred securities issued by banks and insurers
—

 
—

 
—

 
—

 
—

 
—

 
1,678

 
1,329

 
1,678

 
1,329

Small business administration pooled securities
—

 
—

 
—

 
—

 
—

 
—

 
53,317

 
51,927

 
53,317

 
51,927

Total available for sale securities
$
89

 
$
90

 
$
73,232

 
$
72,435

 
$
102,824

 
$
101,501

 
$
274,403

 
$
268,726

 
$
450,548

 
$
442,752

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

 
$
—

 
$
1,004

 
$
1,015

 
$
—

 
$
—

 
$
—

 
$
—

 
$
1,004

 
$
1,015

Agency mortgage-backed securities
—

 
—

 
12,098

 
11,966

 
35,703

 
35,310

 
204,683

 
203,652

 
252,484

 
250,928

Agency collateralized mortgage obligations
—

 
—

 
—

 
—

 
735

 
732

 
332,040

 
325,992

 
332,775

 
326,724

State, county, and municipal securities
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Single issuer trust preferred securities issued by banks
—

 
—

 
—

 
—

 
1,500

 
1,490

 
—

 
—

 
1,500

 
1,490

Small business administration pooled securities
—

 
—

 
—

 
—

 
—

 
—

 
23,727

 
23,483

 
23,727

 
23,483

Total held to maturity securities
$
—

 
$
—

 
$
13,102

 
$
12,981

 
$
37,938

 
$
37,532

 
$
560,450

 
$
553,127

 
$
611,490

 
$
603,640
Schedule of Gross Unrealized Losses and Fair Value of Investments
 
 
 
December 31, 2018
 
 
 
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
3

 
$
9,960

 
$
(43
)
 
$
22,078

 
$
(396
)
 
$
32,038

 
$
(439
)
Agency mortgage-backed securities
144

 
104,616

 
(1,363
)
 
222,850

 
(5,147
)
 
327,466

 
(6,510
)
Agency collateralized mortgage obligations
48

 
57,871

 
(398
)
 
279,229

 
(9,957
)
 
337,100

 
(10,355
)
Single issuer trust preferred securities issued by banks and insurers
2

 
2,197

 
(20
)
 
—

 
—

 
2,197

 
(20
)
Pooled trust preferred securities issued by banks and insurers
1

 
—

 
—

 
1,329

 
(349
)
 
1,329

 
(349
)
Small business administration pooled securities
7

 
28,257

 
(662
)
 
40,621

 
(1,077
)
 
68,878

 
(1,739
)
Total temporarily impaired securities
205

 
$
202,901

 
$
(2,486
)
 
$
566,107

 
$
(16,926
)
 
$
769,008

 
$
(19,412
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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
)