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Investments (Tables)
 9 Months Ended
Sep. 30, 2019
Investments [Abstract]  
Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities

 
September 30, 2019
December 31, 2018
Amortized Cost
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value
Amortized Cost
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value
Securities available-for-sale:
 
 
 
 
 
 
 
 
U.S. Treasuries and U.S.
 
 
 
 
 
 
 
 
government agencies
$
1,279

$
25

$
—

$
1,304

$
5,713

$
20

$
—

$
5,733

Obligations of states and
 
 
 
 

 

 

 

 

political subdivisions
110,714

5,232

7

115,939

128,089

1,033

1,052

128,070

Mortgage-backed securities:
 
 
 
 

 

 

 

 

U.S. government agencies
613,884

17,863

985

630,762

561,799

1,950

12,991

550,758

Private label
11,132

718

—

11,850

11,948

95

—

12,043

Trust preferred securities
4,779

35

595

4,219

4,774

25

—

4,799

Corporate securities
31,948

562

144

32,366

16,795

30

167

16,658

Total Debt Securities
773,736

24,435

1,731

796,440

729,118

3,153

14,210

718,061

Certificates of deposit held for investment
2,490

—

—

2,490

3,735

—

—

3,735

Total Securities Available-for-Sale
$
776,226

$
24,435

$
1,731

$
798,930

$
732,853

$
3,153

$
14,210

$
721,796
Aggregate Carrying And Approximate Market Values Of Held-To-Maturity Securities
Securities held-to-maturity:
 
 
 
 
 
 
 
 
Mortgage-backed securities:
 
 
 
 
 
 
 
 
U.S. government agencies
$
51,211

$
1,634

$
—

$
52,845

$
56,827

$
173

$
294

$
56,706

Trust preferred securities
—

—

—

—

4,000

—

—

4,000

Total Securities Held-to-Maturity
$
51,211

$
1,634

$
—

$
52,845

$
60,827

$
173

$
294

$
60,706
Gross Unrealized Losses And Fair Value Of Investments The following table shows the gross unrealized losses and fair value of the Company’s investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):

 
September 30, 2019
Less Than Twelve Months
Twelve Months or Greater
Total
Estimated Fair Value
Unrealized Loss
Estimated Fair Value
Unrealized Loss
Estimated Fair Value
Unrealized Loss
Securities available-for-sale:
 
 
 
 
 
 
Obligations of states and political subdivisions
$
230

$
—

$
1,439

$
7

$
1,669

$
7

Mortgage-backed securities:
 
 
 
 
 

 

U.S. Government agencies
50,385

356

52,311

629

102,696

985

Trust preferred securities
3,950

595

—

—

3,950

595

Corporate securities
15,035

144

—

—

15,035

144

Total available-for-sale
$
69,600

$
1,095

$
53,750

$
636

$
123,350

$
1,731


There were no held-to-maturity securities in an unrealized loss position as of September 30, 2019.

 
December 31, 2018
Less Than Twelve Months
Twelve Months or Greater
Total
Estimated Fair Value
Unrealized Loss
Estimated Fair Value
Unrealized Loss
Estimated Fair Value
Unrealized Loss
Securities available-for-sale:
 
 
 
 
 
 
Obligations of states and political subdivisions
$
11,837

$
272

$
22,068

$
780

$
33,905

$
1,052

Mortgage-backed securities:
 
 
 
 
 

 

U.S. Government agencies
84,975

1,593

282,560

11,398

367,535

12,991

Corporate securities
12,995

167

—

—

12,995

167

Total available-for-sale
$
109,807

$
2,032

$
304,628

$
12,178

$
414,435

$
14,210

 
 
 
 
 
 
 
Securities held-to-maturity:
 
 
 
 
 
 
Mortgage-backed securities
 
 
 
 
 
 
       U.S. Government agencies
$
28,274

$
126

$
5,960

$
168

$
34,234

$
294

Total held-to-maturity
$
28,274

$
126

$
5,960

$
168

$
34,234

$
294
Amortized Cost And Estimated Fair Value Of Debt Securities By Contractual Maturity
The amortized cost and estimated fair value of debt securities at September 30, 2019, by contractual maturity, are shown in the following table (in thousands).  Expected maturities will differ from contractual maturities because the issuers of the securities may have the right to prepay obligations without prepayment penalties.  Mortgage-backed securities have been allocated to their respective maturity groupings based on their contractual maturity.
 
Amortized Cost
Estimated Fair Value
Available-for-Sale Debt Securities
 
 
Due in one year or less
$
1,344

$
1,355

Due after one year through five years
14,996

15,361

Due after five years through ten years
185,615

192,622

Due after ten years
571,781

587,102

Total
$
773,736

$
796,440

 
 
 
Held-to-Maturity Debt Securities
 

 

Due in one year or less
$
—

$
—

Due after one year through five years
—

—

Due after five years through ten years
4,934

5,374

Due after ten years
46,277

47,471

Total
$
51,211

$
52,845
Gross Gains And Losses Realized
Gross gains and gross losses recognized by the Company from investment security transactions are summarized in the table below (in thousands):
 
Three months ended September 30,
Nine months ended September 30,
 
2019
2018
2019
2018
Gross realized gains on securities sold
$
116

$
—

$
226

$
—

Gross realized losses on securities sold
(156
)
—

(157
)
—

Net investment security (losses) gains
$
(40
)
$
—

$
69

$
—

 
 
 
 
 
Gross unrealized gains recognized on equity securities still held
$
14

$
384

$
255

$
1,155

Gross unrealized losses recognized on equity securities still held
(228
)
—

(282
)
—

Net unrealized (losses) gains recognized on equity securities still held
$
(214
)
$
384

$
(27
)
$
1,155