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SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale
The amortized cost and estimated fair value of securities available for sale along with gross unrealized gains and losses are summarized as follows:
(dollars in thousands)
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
December 31, 2017
 
 
 
 
 
 
 
State, county and municipal securities
135,968

 
1,989

 
(163
)
 
137,794

Corporate debt securities
46,659

 
721

 
(237
)
 
47,143

Mortgage-backed securities
630,666

 
1,762

 
(6,492
)
 
625,936

Total debt securities
$
813,293

 
$
4,472

 
$
(6,892
)
 
$
810,873

 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
U.S. government sponsored agencies
$
999

 
$
21

 
$
—

 
$
1,020

State, county and municipal securities
149,899

 
2,605

 
(469
)
 
152,035

Corporate debt securities
32,375

 
167

 
(370
)
 
32,172

Mortgage-backed securities
641,362

 
2,700

 
(6,554
)
 
637,508

Total debt securities
$
824,635

 
$
5,493

 
$
(7,393
)
 
$
822,735
Schedule of Gross Unrealized Losses and Fair Value of Securities
The following table shows the gross unrealized losses and estimated fair value of securities aggregated by category and length of time that securities have been in a continuous unrealized loss position at December 31, 2017 and 2016.
 
 
Less Than 12 Months
 
12 Months or More
 
Total
(dollars in thousands)
 
Estimated
Fair
Value
 
Unrealized Losses
 
Estimated
Fair
Value
 
Unrealized Losses
 
Estimated
Fair
Value
 
Unrealized Losses
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
State, county and municipal securities
 
33,976

 
(115
)
 
4,725

 
(48
)
 
38,701

 
(163
)
Corporate debt securities
 
3,465

 
(35
)
 
18,853

 
(202
)
 
22,318

 
(237
)
Mortgage-backed securities
 
262,353

 
(2,401
)
 
190,368

 
(4,091
)
 
452,721

 
(6,492
)
Total debt securities
 
$
299,794

 
$
(2,551
)
 
$
213,946

 
$
(4,341
)
 
$
513,740

 
$
(6,892
)
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 
State, county and municipal securities
 
47,647

 
(469
)
 
—

 
—

 
47,647

 
(469
)
Corporate debt securities
 
18,377

 
(363
)
 
493

 
(7
)
 
18,870

 
(370
)
Mortgage-backed securities
 
414,300

 
(6,177
)
 
11,791

 
(377
)
 
$
426,091

 
(6,554
)
Total debt securities
 
$
480,324

 
$
(7,009
)
 
$
12,284

 
$
(384
)
 
$
492,608

 
$
(7,393
)
Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity
The amortized cost and estimated fair value of debt securities available for sale as of December 31, 2017, by contractual maturity are shown below. Maturities may differ from contractual maturities in mortgage-backed securities because the mortgages underlying the securities may be called or repaid without penalty. Securities not due at a single maturity date are shown separately. Therefore, these securities are not included in the maturity categories in the following maturity summary.
(dollars in thousands)
Amortized
Cost
 
Estimated
Fair
Value
Due in one year or less
$
11,510

 
$
11,562

Due from one year to five years
58,549

 
58,881

Due from five to ten years
73,566

 
74,861

Due after ten years
39,002

 
39,633

Mortgage-backed securities
630,666

 
625,936

 
$
813,293

 
$
810,873
Gross Realized Gains And Losses On Sales Of Available For Sale Securities
Gains and losses on sales of securities available for sale consist of the following:
 
For the Years Ended
December 31,
(dollars in thousands)
2017
 
2016
 
2015
Gross gains on sales of securities
$
38

 
$
312

 
$
396

Gross losses on sales of securities
(1
)
 
(218
)
 
(259
)
Net realized gains on sales of securities available for sale
$
37

 
$
94

 
$
137