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MARKETABLE SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Fair Value of Available for Sale and Held to Maturity Securities
The following table summarizes the amortized cost and fair value of securities available for sale and securities held to maturity at December 31, 2017 and 2016 and the corresponding amounts of gross unrealized gains and losses:
 
December 31, 2017
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
Available for sale:
 
Corporate bonds
$
18,823

 
$
64

 
$
50

 
$
18,837

Municipal securities
7,746

 
—

 
200

 
7,546

Mortgage-backed securities
92,471

 
—

 
1,793

 
90,678

Collateralized mortgage obligations
116,809

 
5

 
1,503

 
115,311

Total available for sale
$
235,849

 
$
69

 
$
3,546

 
$
232,372

 
 
 
 
 
 
 
 
Held to maturity:
 
Municipal securities
$
146,496

 
$
2,244

 
$
218

 
$
148,522

Mortgage-backed securities
22,026

 
199

 
230

 
21,995

Collateralized mortgage obligations
6,162

 
111

 
—

 
6,273

Total held to maturity
$
174,684

 
$
2,554

 
$
448

 
$
176,790

December 31, 2016
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
Available for sale:
 
Corporate bonds
$
25,254

 
$
6

 
$
377

 
$
24,883

Municipal securities
7,841

 
—

 
622

 
7,219

Mortgage-backed securities
61,298

 
—

 
1,608

 
59,690

Collateralized mortgage obligations
65,789

 
10

 
666

 
65,133

Total available for sale
$
160,182

 
$
16

 
$
3,273

 
$
156,925

 
 
 
 
 
 
 
 
Held to maturity:
 
Municipal securities
$
149,420

 
$
901

 
$
3,889

 
$
146,432

Mortgage-backed securities
28,450

 
318

 
290

 
28,478

Collateralized mortgage obligations
11,501

 
265

 
521

 
11,245

Total held to maturity
$
189,371

 
$
1,484

 
$
4,700

 
$
186,155
Schedule of Securities with Gross Unrealized Losses
The following table summarizes securities with unrealized losses at December 31, 2017 and 2016, aggregated by major security type and length of time in a continuous unrealized loss position:
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds
$
(50
)
 
$
8,019

 
$
—

 
$
—

 
$
(50
)
 
$
8,019

Municipal securities
—

 
—

 
(200
)
 
7,546

 
(200
)
 
7,546

Mortgage-backed securities
(658
)
 
42,881

 
(1,135
)
 
47,797

 
(1,793
)
 
90,678

Collateralized mortgage obligations
(1,091
)
 
93,584

 
(412
)
 
21,258

 
(1,503
)
 
114,842

Total available for sale
$
(1,799
)
 
$
144,484

 
$
(1,747
)
 
$
76,601

 
$
(3,546
)
 
$
221,085

 
 
 
 
 
 
 
 
 
 
 
 
Held to maturity:
 
 
 
 
 
 
 
 
 
 
 
Municipal securities
$
(37
)
 
$
9,230

 
$
(181
)
 
$
19,961

 
$
(218
)
 
$
29,191

Mortgage-backed securities
(57
)
 
6,499

 
(173
)
 
9,747

 
(230
)
 
16,246

Collateralized mortgage obligations
—

 
—

 
—

 
—

 
—

 
—

Total held to maturity
$
(94
)
 
$
15,729

 
$
(354
)
 
$
29,708

 
$
(448
)
 
$
45,437

 
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
Corporate bonds
$
(377
)
 
$
22,529

 
$
—

 
$
—

 
$
(377
)
 
$
22,529

Municipal securities
(622
)
 
7,219

 
—

 
—

 
(622
)
 
7,219

Mortgage-backed securities
(1,047
)
 
44,420

 
(561
)
 
15,270

 
(1,608
)
 
59,690

Collateralized mortgage obligations
(437
)
 
55,435

 
(229
)
 
9,049

 
(666
)
 
64,484

Total available for sale
$
(2,483
)
 
$
129,603

 
$
(790
)
 
$
24,319

 
$
(3,273
)
 
$
153,922

 
 
 
 
 
 
 
 
 
 
 
 
Held to maturity:
 
 
 
 
 
 
 
 
 
 
 
Municipal securities
$
(3,889
)
 
$
98,943

 
$
—

 
$
—

 
$
(3,889
)
 
$
98,943

Mortgage-backed securities
(290
)
 
19,983

 
—

 
—

 
(290
)
 
19,983

Collateralized mortgage obligations
—

 
—

 
(521
)
 
2,350

 
(521
)
 
2,350

Total held to maturity
$
(4,179
)
 
$
118,926

 
$
(521
)
 
$
2,350

 
$
(4,700
)
 
$
121,276
Schedule of Proceeds from Sales of Securities
The proceeds from sales of securities and the associated gains and losses are listed below:
 
2017
 
2016
 
2015
Proceeds
$
217,111

 
$
105,808

 
$
140,668

Gross gains
180

 
243

 
222

Gross losses
(13
)
 
(161
)
 
(145
)
Schedule of Sale of Held To Maturity Securities
Sales of securities held to maturity were as follows for the years ended December 31:
 
2017
 
2016
 
2015
Proceeds from sales
$
3,298

 
$
1,866

 
$
—

Amortized cost
3,140

 
1,842

 
—

Gross realized gains
158

 
24

 
—

Gross realized losses
—

 
—

 
—

Tax expense related to securities gains/losses
(44
)
 
(7
)
 
—
Investments Classified by Contractual Maturity Date
The contractual maturities at December 31, 2017 of available for sale and held to maturity securities at carrying value and estimated fair value are shown below. The Company invests in mortgage-backed securities and collateralized mortgage obligations that have expected maturities that differ from their contractual maturities. These differences arise because borrowers and/or issuers may have the right to call or prepay their obligation with or without call or prepayment penalties.
 
Available for Sale
 
Held to Maturity
 
Amortized
Cost
 
Estimated
Fair
Value
 
Amortized
Cost
 
Estimated
Fair
Value
December 31, 2017
 
 
 
 
 
 
 
Due within one year
$
—

 
$
—

 
$
2,663

 
$
2,665

Due after one year through five years
6,158

 
6,129

 
5,769

 
5,849

Due after five years through ten years
12,665

 
12,708

 
42,711

 
43,903

Due after ten years
7,746

 
7,546

 
95,353

 
96,105

Mortgage-backed securities
92,471

 
90,678

 
22,026

 
21,995

Collateralized mortgage obligations
116,809

 
115,311

 
6,162

 
6,273

 
$
235,849

 
$
232,372

 
$
174,684

 
$
176,790