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INVESTMENT SECURITIES (Tables)
 3 Months Ended
Mar. 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 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
March 31, 2018
 
 
 
 
 
 
 
 
State, county and municipal securities
 
105,821

 
987

 
(534
)
 
106,274

Corporate debt securities
 
57,134

 
598

 
(635
)
 
57,097

Mortgage-backed securities
 
699,990

 
456

 
(15,232
)
 
685,214

Total debt securities
 
$
862,945

 
$
2,041

 
$
(16,401
)
 
$
848,585

 
 
 
 
 
 
 
 
 
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
Amortized Cost and Fair Value of Available for Sale Securities by Contractual Maturity
The amortized cost and estimated fair value of available for sale securities at March 31, 2018 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
 
$
11,606

 
$
11,643

Due from one year to five years
 
46,869

 
46,432

Due from five to ten years
 
64,190

 
64,842

Due after ten years
 
40,290

 
40,454

Mortgage-backed securities
 
699,990

 
685,214

 
 
$
862,945

 
$
848,585
Schedule of Gross Unrealized Losses and Fair Value of Securities
The following table details the gross unrealized losses and estimated fair value of securities aggregated by category and duration of continuous unrealized loss position at March 31, 2018 and December 31, 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
March 31, 2018
 
 

 
 

 
 

 
 

 
 

 
 

State, county and municipal securities
 
54,182

 
(448
)
 
4,662

 
(86
)
 
58,844

 
(534
)
Corporate debt securities
 
492

 
(126
)
 
18,501

 
(509
)
 
18,993

 
(635
)
Mortgage-backed securities
 
422,035

 
(8,322
)
 
172,548

 
(6,910
)
 
594,583

 
(15,232
)
Total debt securities
 
$
476,709

 
$
(8,896
)
 
$
195,711

 
$
(7,505
)
 
$
672,420

 
$
(16,401
)
 
 
 
 
 
 
 
 
 
 
 
 
 
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
)
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 three months ended March 31, 2018 and 2017:
(dollars in thousands)
 
March 31,
2018
 
March 31,
2017
Gross gains on sales of securities
 
$
332

 
$
—

Gross losses on sales of securities
 
(295
)
 
—

Net realized gains on sales of securities available for sale
 
$
37

 
$
—

 
 
 
 
 
Sales proceeds
 
$
36,685

 
$
—