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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Available-for-Sale
 
 
 
 
U.S. Treasury notes
$
3,608

$
5

$
(1
)
$
3,612

Obligations of U.S. government agencies
397,411

343

(6,457
)
391,297

U.S. agency residential mortgage-backed securities &
   collateralized mortgage obligations
1,220,890

6,412

(13,601
)
1,213,701

Private mortgage-backed securities
116

1

(1
)
116

Other investments
2,951

21

—

2,972

Total
$
1,624,976

$
6,782

$
(20,060
)
$
1,611,698

December 31, 2016
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Held-to Maturity
 
 
 
 
State, county and municipal securities
$
160,192

$
2,723

$
(542
)
$
162,373

Corporate securities
53,032

139

(211
)
52,960

Obligations of U.S. government agencies
19,737

—

(162
)
19,575

U.S agency residential mortgage-backed securities &
collateralized mortgage obligations
279,578

7,804

(9,249
)
278,133

Other investments
231

1

—

232

Total
$
512,770

$
10,667

$
(10,164
)
$
513,273



Gross gains of $423 and gross losses of $93 were realized on the disposition of available-for-sale securities in 2016.
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 securities
354

1

—

355

Total
$
600,665

$
12,854

$
(5,969
)
$
607,550
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, 2016 and 2015.
 
Less than 12 Months
12 Months or More
Total
December 31, 2016
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
Available-for-Sale
 
 
 
 
 
 
U.S. Treasury notes
$
598

$
(1
)
$
—

$
—

$
598

$
(1
)
Obligations of U.S. government agencies
316,511

(6,457
)
—

—

316,511

(6,457
)
U.S. agency residential mortgage-backed
   securities & collateralized mortgage
   obligations
746,265

(13,102
)
15,801

(499
)
762,066

(13,601
)
Private mortgage-backed securities
—

—

48

(1
)
48

(1
)
Other investments
—

—

—

—

—

—

Total
$
1,063,374

$
(19,560
)
$
15,849

$
(500
)
$
1,079,223

$
(20,060
)
 
Less than 12 Months
12 Months or More
Total
December 31, 2016
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
Fair
Value
Gross
Unrealized
Losses
Held-to-Maturity
 
 
 
 
 
 
State, county and municipal securities
$
42,518

$
(533
)
$
2,831

$
(9
)
$
45,349

$
(542
)
Corporate securities
32,474

(211
)
—

—

32,474

(211
)
Obligations of U.S. government agencies
19,575

(162
)
—

—

19,575

(162
)
U.S. agency residential mortgage-backed
securities & collateralized mortgage
obligations
108,857

(7,973
)
19,986

(1,276
)
128,843

(9,249
)
Total
$
203,424

$
(8,879
)
$
22,817

$
(1,285
)
$
226,241

$
(10,164
)
 
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
)
Maturities of Investment Securities
All other investment securities maturities are shown at contractual maturity dates.
 
Available-for-Sale
 
Held-to-Maturity
December 31, 2016
Amortized
Cost
Estimated
Fair Value
 
Amortized
Cost
Estimated
Fair Value
Within one year
$
343,675

$
341,720

 
$
89,581

$
90,105

After one year but within five years
1,109,151

1,100,551

 
285,138

283,668

After five years but within ten years
135,520

133,012

 
111,437

112,852

After ten years
36,630

36,415

 
26,614

26,648

Total
$
1,624,976

$
1,611,698

 
$
512,770

$
513,273