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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 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 investment securities available for sale, along with unrealized gains and losses, are summarized as follows:
(dollars in thousands)
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
September 30, 2017
 
 
 
 
 
 
 
 
U.S. government sponsored agencies
 
$
1,000

 
$
4

 
$
—

 
$
1,004

State, county and municipal securities
 
140,190

 
3,271

 
(74
)
 
143,387

Corporate debt securities
 
46,704

 
661

 
(116
)
 
47,249

Mortgage-backed securities
 
626,927

 
3,774

 
(2,748
)
 
627,953

Total debt securities
 
$
814,821

 
$
7,710

 
$
(2,938
)
 
$
819,593

 
 
 
 
 
 
 
 
 
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
Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity
The amortized cost and fair value of available-for-sale securities at September 30, 2017 by contractual maturity are summarized in the table below. Expected maturities for mortgage-backed securities may differ from contractual maturities because in certain cases borrowers can prepay obligations without prepayment penalties. Therefore, these securities are not included in the following maturity summary.
(dollars in thousands)
 
Amortized
Cost
 
Estimated
Fair
Value
Due in one year or less
 
$
14,094

 
$
14,205

Due from one year to five years
 
57,385

 
58,204

Due from five to ten years
 
77,194

 
79,093

Due after ten years
 
39,221

 
40,138

Mortgage-backed securities
 
626,927

 
627,953

 
 
$
814,821

 
$
819,593
Schedule of Gross Unrealized Losses and Fair Value of Securities
The following table details the gross unrealized losses and fair value of securities aggregated by category and duration of continuous unrealized loss position at September 30, 2017 and December 31, 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
September 30, 2017
 
 

 
 

 
 

 
 

 
 

 
 

U.S. government sponsored agencies
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

State, county and municipal securities
 
11,333

 
(18
)
 
4,240

 
(56
)
 
15,573

 
(74
)
Corporate debt securities
 
8,131

 
(35
)
 
10,854

 
(81
)
 
18,985

 
(116
)
Mortgage-backed securities
 
225,258

 
(1,685
)
 
54,465

 
(1,063
)
 
279,723

 
(2,748
)
Total debt securities
 
$
244,722

 
$
(1,738
)
 
$
69,559

 
$
(1,200
)
 
$
314,281

 
$
(2,938
)
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
 

 
 

 
 

 
 

 
 

 
 

U.S. government sponsored agencies
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

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
)
Gross Realized Gains And Losses On Sales Of Available For Sale Securities
The following table is a summary of sales activities in the Company’s investment securities available for sale for the nine months ended September 30, 2017 and 2016:
(dollars in thousands)
 
September 30,
2017
 
September 30,
2016
Gross gains on sales of securities
 
$
38

 
$
312

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

 
$
94

 
 
 
 
 
Sales proceeds
 
$
3,090

 
$
53,026