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Investment Securities (Tables)
 9 Months Ended
Sep. 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:
September 30, 2015
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Available-for-Sale:
 
 
 
 
U.S. Treasury notes
$
3,913

$
28

$
—

$
3,941

Obligations of U.S. government agencies
604,198

2,196

(350
)
606,044

U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
917,025

15,314

(1,284
)
931,055

Private mortgage-backed securities
257

3

(2
)
258

Other investments
3,795

—

—

3,795

Total
$
1,529,188

$
17,541

$
(1,636
)
$
1,545,093

September 30, 2015
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Held-to-Maturity:
 
 
 
 
State, county and municipal securities
$
176,569

$
5,471

$
(200
)
$
181,840

Corporate securities
50,178

186

(49
)
50,315

U.S agency residential mortgage-backed securities &
    collateralized mortgage obligations
295,418

10,346

(3,665
)
302,099

Other investments
378

1

—

379

Total
$
522,543

$
16,004

$
(3,914
)
$
534,633

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 September 30,
 
Nine Months Ended September 30,
 
2015
 
2014
 
2015
 
2014
Gross realized gains
$
23

 
$
—

 
$
75

 
$
243

Gross realized losses
—

 
(8
)
 
—

 
(163
)
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 September 30, 2015 and December 31, 2014.
 
Less than 12 Months
 
12 Months or More
 
Total
September 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

$
(85
)
 
$
131,365

$
(265
)
 
$
237,881

$
(350
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
25,664

(106
)
 
80,116

(1,178
)
 
105,780

(1,284
)
Private mortgage-backed securities
—

—

 
71

(2
)
 
71

(2
)
Total
$
132,180

$
(191
)
 
$
211,552

$
(1,445
)
 
$
343,732

$
(1,636
)
 
Less than 12 Months
 
12 Months or More
 
Total
September 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
$
6,398

$
(26
)
 
$
10,493

$
(174
)
 
$
16,891

$
(200
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
14,834

(3,081
)
 
27,344

(584
)
 
42,178

(3,665
)
Corporate securities
15,042

(49
)
 
—

—

 
15,042

(49
)
Total
$
36,274

$
(3,156
)
 
$
37,837

$
(758
)
 
$
74,111

$
(3,914
)

 
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 September 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
September 30, 2015
Amortized
Cost
Estimated
Fair Value
 
Amortized
Cost
Estimated
Fair Value
Within one year
$
344,473

$
348,859

 
$
92,096

$
94,244

After one year but within five years
1,119,450

1,130,128

 
266,554

271,638

After five years but within ten years
56,054

56,755

 
120,530

123,839

After ten years
9,211

9,351

 
43,363

44,912

Total
$
1,529,188

$
1,545,093

 
$
522,543

$
534,633