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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 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:
December 31, 2015
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Available-for-Sale
 
 
 
 
U.S. Treasury notes
$
3,912

$
3

$
(4
)
$
3,911

Obligations of U.S. government agencies
521,079

712

(1,610
)
520,181

U.S. agency residential mortgage-backed securities &
   collateralized mortgage obligations
921,699

9,448

(2,101
)
929,046

Private mortgage-backed securities
156

1

(1
)
156

Other investments
3,550

5

(9
)
3,546

Total
$
1,450,396

$
10,169

$
(3,725
)
$
1,456,840

December 31, 2015
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Held-to Maturity
 
 
 
 
State, county and municipal securities
$
173,785

$
5,103

$
(227
)
$
178,661

Corporate securities
50,046

64

(220
)
49,890

U.S agency residential mortgage-backed securities &
collateralized mortgage obligations
376,480

7,686

(5,522
)
378,644

Other investments
354

1

—

355

Total
$
600,665

$
12,854

$
(5,969
)
$
607,550



Gross gains of $156 and gross losses of $19 were realized on the disposition of available-for-sale securities in 2015.
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 securities
504

—

—

504

Total
$
575,186

$
11,566

$
(2,219
)
$
584,533
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 December 31, 2015 and 2014.
 
Less than 12 Months
12 Months or More
Total
December 31, 2015
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
Available-for-Sale
 
 
 
 
 
 
U.S. Treasury notes
$
2,092

$
(4
)
$
—

$
—

$
2,092

$
(4
)
Obligations of U.S. government agencies
209,631

(1,077
)
54,619

(533
)
264,250

(1,610
)
U.S. agency residential mortgage-backed
   securities & collateralized mortgage
   obligations
343,875

(1,577
)
28,010

(524
)
371,885

(2,101
)
Private mortgage-backed securities
—

—

61

(1
)
61

(1
)
Other investments
1,225

(9
)
—

—

1,225

(9
)
Total
$
556,823

$
(2,667
)
$
82,690

$
(1,058
)
$
639,513

$
(3,725
)
 
Less than 12 Months
12 Months or More
Total
December 31, 2015
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
Held-to-Maturity
 
 
 
 
 
 
State, county and municipal securities
$
10,182

$
(39
)
$
9,476

$
(188
)
$
19,658

$
(227
)
U.S. agency residential mortgage-backed
securities & collateralized mortgage
obligations
87,033

(4,390
)
69,539

(1,132
)
156,572

(5,522
)
Corporate securities
31,135

(220
)
—

—

31,135

(220
)
Total
$
128,350

$
(4,649
)
$
79,015

$
(1,320
)
$
207,365

$
(5,969
)
 
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
All other investment securities maturities are shown at contractual maturity dates.
 
Available-for-Sale
 
Held-to-Maturity
December 31, 2015
Amortized
Cost
Estimated
Fair Value
 
Amortized
Cost
Estimated
Fair Value
Within one year
$
329,638

$
331,620

 
$
100,695

$
101,885

After one year but within five years
1,018,573

1,022,351

 
320,310

322,281

After five years but within ten years
46,874

47,117

 
134,606

137,304

After ten years
55,311

55,752

 
45,054

46,080

Total
$
1,450,396

$
1,456,840

 
$
600,665

$
607,550