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INVESTMENT SECURITIES (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018
 
 
 
 
 
 
 
State, county and municipal securities
$
149,670

 
$
1,367

 
$
(304
)
 
$
150,733

Corporate debt securities
67,123

 
718

 
(527
)
 
67,314

Mortgage-backed securities
982,183

 
4,172

 
(11,979
)
 
974,376

Total debt securities
$
1,198,976

 
$
6,257

 
$
(12,810
)
 
$
1,192,423

 
 
 
 
 
 
 
 
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
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, 2018 and 2017.
 
 
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, 2018
 
 
 
 
 
 
 
 
 
 
 
 
State, county and municipal securities
 
$
23,784

 
$
(52
)
 
$
33,873

 
$
(252
)
 
$
57,657

 
$
(304
)
Corporate debt securities
 
17,291

 
(111
)
 
17,952

 
(416
)
 
35,243

 
(527
)
Mortgage-backed securities
 
119,745

 
(580
)
 
435,749

 
(11,399
)
 
555,494

 
(11,979
)
Total debt securities
 
$
160,820

 
$
(743
)
 
$
487,574

 
$
(12,067
)
 
$
648,394

 
$
(12,810
)
 
 
 
 
 
 
 
 
 
 
 
 
 
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
)
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, 2018, 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
$
16,900

 
$
16,907

Due from one year to five years
86,338

 
86,234

Due from five to ten years
84,383

 
85,595

Due after ten years
29,172

 
29,311

Mortgage-backed securities
982,183

 
974,376

 
$
1,198,976

 
$
1,192,423
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)
2018
 
2017
 
2016
Gross gains on sales of securities
$
390

 
$
38

 
$
312

Gross losses on sales of securities
(301
)
 
(1
)
 
(218
)
Net realized gains on sales of securities available for sale
$
89

 
$
37

 
$
94
Gain (Loss) on Securities
Total gain (loss) on securities reported on the consolidated statements of income is comprised of the following:
 
For the Years Ended
December 31,
(dollars in thousands)
2018
 
2017
 
2016
Net realized gains on sales of securities available for sale
$
89

 
$
37

 
$
94

Unrealized holding losses on equity securities
(126
)
 
—

 
—

Total gain (loss) on securities
$
(37
)
 
$
37

 
$
94