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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Approximate Fair Values of Investment Securities
The amortized cost and approximate fair values of investment securities are summarized as follows:
June 30, 2015
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Available-for-Sale:
 
 
 
 
Obligations of U.S. government agencies
$
622,237

$
1,087

$
(2,304
)
$
621,020

U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
965,430

10,468

(4,463
)
971,435

Private mortgage-backed securities
286

4

(2
)
288

Total
$
1,587,953

$
11,559

$
(6,769
)
$
1,592,743

June 30, 2015
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Held-to-Maturity:
 
 
 
 
State, county and municipal securities
$
181,642

$
4,644

$
(524
)
$
185,762

Corporate securities
50,310

59

(204
)
50,165

U.S agency residential mortgage-backed securities &
    collateralized mortgage obligations
314,326

5,945

(3,288
)
316,983

Other investments
412

1

—

413

Total
$
546,690

$
10,649

$
(4,016
)
$
553,323

December 31, 2014
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Available-for-Sale:
 
 
 
 
Obligations of U.S. government agencies
$
725,408

$
895

$
(5,370
)
$
720,933

U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
982,764

11,526

(3,624
)
990,666

Private mortgage-backed securities
322

5

(2
)
325

Total
$
1,708,494

$
12,426

$
(8,996
)
$
1,711,924

December 31, 2014
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Held-to-Maturity:
 
 
 
 
State, county and municipal securities
$
188,941

$
5,949

$
(386
)
$
194,504

Corporate securities
32,565

54

(75
)
32,544

U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
353,176

5,563

(1,758
)
356,981

Other Investments
504

—

—

504

Total
$
575,186

$
11,566

$
(2,219
)
$
584,533
Realized Gains (Losses) on Investments
Gross realized gains and losses from the disposition of investment securities are summarized in the following table:
    
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Gross realized gains
$
46

 
$
18

 
$
52

 
$
243

Gross realized losses
—

 
1

 
—

 
155
Gross Unrealized Losses and Fair Values of Investment Securities
The following tables show the gross unrealized losses and fair values of investment securities, aggregated by investment category, and the length of time individual investment securities have been in a continuous unrealized loss position, as of June 30, 2015 and December 31, 2014.
 
Less than 12 Months
 
12 Months or More
 
Total
June 30, 2015
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Available-for-Sale:
 
 
 
 
 
 
 
 
Obligations of U.S. government agencies
$
106,516

$
(460
)
 
$
239,339

$
(1,844
)
 
$
345,855

$
(2,304
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
254,399

(1,480
)
 
133,709

(2,983
)
 
388,108

(4,463
)
Private mortgage-backed securities
—

—

 
83

(2
)
 
83

(2
)
Total
$
360,915

$
(1,940
)
 
$
373,131

$
(4,829
)
 
$
734,046

$
(6,769
)
 
Less than 12 Months
 
12 Months or More
 
Total
June 30, 2015
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Held-to-Maturity:
 
 
 
 
 
 
 
 
State, county and municipal securities
$
19,427

$
(165
)
 
$
13,513

$
(359
)
 
$
32,940

$
(524
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
85,286

(3,288
)
 
—

—

 
85,286

(3,288
)
Corporate securities
31,291

(204
)
 
—

—

 
31,291

(204
)
Total
$
136,004

$
(3,657
)
 
$
13,513

$
(359
)
 
$
149,517

$
(4,016
)

 
Less than 12 Months
 
12 Months or More
 
Total
December 31, 2014
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Available-for-Sale:
 
 
 
 
 
 
 
 
Obligations of U.S. government agencies
$
135,888

$
(702
)
 
$
309,283

$
(4,668
)
 
$
445,171

$
(5,370
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
219,214

(887
)
 
151,380

(2,737
)
 
370,594

(3,624
)
Private mortgage-backed securities
—

—

 
90

(2
)
 
90

(2
)
Total
$
355,102

$
(1,589
)
 
$
460,753

$
(7,407
)
 
$
815,855

$
(8,996
)
 
Less than 12 Months
 
12 Months or More
 
Total
December 31, 2014
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Held-to-Maturity:
 
 
 
 
 
 
 
 
State, county and municipal securities
$
7,979

$
(13
)
 
$
20,097

$
(373
)
 
$
28,076

$
(386
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
61,201

(1,758
)
 
—

—

 
61,201

(1,758
)
Corporate securities
14,755

(75
)
 
—

—

 
14,755

(75
)
Total
$
83,935

$
(1,846
)
 
$
20,097

$
(373
)
 
$
104,032

$
(2,219
)
Maturities of Investment Securities
Maturities of investment securities at June 30, 2015 are shown below. Maturities of mortgage-backed securities have been adjusted to reflect shorter maturities based upon estimated prepayments of principal. All other investment securities maturities are shown at contractual maturity dates.
 
Available-for-Sale
 
Held-to-Maturity
June 30, 2015
Amortized
Cost
Estimated
Fair Value
 
Amortized
Cost
Estimated
Fair Value
Within one year
$
321,079

$
322,976

 
$
97,639

$
98,594

After one year but within five years
1,189,454

1,192,101

 
273,778

276,390

After five years but within ten years
58,106

58,232

 
125,446

127,706

After ten years
19,314

19,434

 
49,827

50,633

Total
$
1,587,953

$
1,592,743

 
$
546,690

$
553,323