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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Available-for-Sale:
 
 
 
 
U.S. Treasury notes
$
3,607

$
2

$
(2
)
$
3,607

Obligations of U.S. government agencies
676,485

1,647

(2,814
)
675,318

U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
1,217,701

10,001

(4,765
)
1,222,937

Private mortgage-backed securities
108,577

212

(304
)
108,485

Corporate securities
66,793

97

(6
)
66,884

Other investments
2,951

12

—

2,963

Total
$
2,076,114

$
11,971

$
(7,891
)
$
2,080,194

June 30, 2017
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Held-to-Maturity:
 
 
 
 
State, county and municipal securities
$
188,486

$
4,172

$
(141
)
$
192,517

U.S agency residential mortgage-backed securities &
collateralized mortgage obligations
268,218

10,714

(9,360
)
269,572

Obligations of U.S. government agencies
19,737

28

(5
)
19,760

Corporate securities
52,804

333

(39
)
53,098

Other investments
197

1

—

198

Total
$
529,442

$
15,248

$
(9,545
)
$
535,145

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

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

Corporate securities
53,032

139

(211
)
52,960

Other investments
231

1

—

232

Total
$
512,770

$
10,667

$
(10,164
)
$
513,273
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,
 
2017
 
2016
 
2017
 
2016
Gross realized gains
$
5

 
$
108

 
$
7

 
$
165

Gross realized losses
—

 
—

 
—

 
(78
)
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, 2017 and December 31, 2016:
 
Less than 12 Months
 
12 Months or More
 
Total
June 30, 2017
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Available-for-Sale:
 
 
 
 
 
 
 
 
U.S. Treasury notes
$
1,797

$
(2
)
 
$
—

$
—

 
$
1,797

$
(2
)
Obligations of U.S. government agencies
359,889

(2,804
)
 
9,989

(10
)
 
369,878

(2,814
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
599,643

(4,346
)
 
21,848

(419
)
 
621,491

(4,765
)
Private mortgage-backed securities
1,484

(303
)
 
42

(1
)
 
1,526

(304
)
Corporate securities
8,100

(6
)
 
—

—

 
8,100

(6
)
Total
$
970,913

$
(7,461
)
 
$
31,879

$
(430
)
 
$
1,002,792

$
(7,891
)
 
Less than 12 Months
 
12 Months or More
 
Total
June 30, 2017
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Held-to-Maturity:
 
 
 
 
 
 
 
 
State, county and municipal securities
$
21,331

$
(139
)
 
$
884

$
(2
)
 
$
22,215

$
(141
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
42,109

(8,069
)
 
17,766

(1,291
)
 
59,875

(9,360
)
Obligations of U.S. government agencies
9,985

(5
)
 
—

—

 
9,985

(5
)
Corporate securities
15,074

(39
)
 
—

—

 
15,074

(39
)
Total
$
88,499

$
(8,252
)
 
$
18,650

$
(1,293
)
 
$
107,149

$
(9,545
)
 
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
)
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
)
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
)
Corporate securities
32,474

(211
)
 
—

—

 
32,474

(211
)
Total
$
203,424

$
(8,879
)
 
$
22,817

$
(1,285
)
 
$
226,241

$
(10,164
)
Maturities of Investment Securities
Maturities of investment securities at June 30, 2017 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, 2017
Amortized
Cost
Estimated
Fair Value
 
Amortized
Cost
Estimated
Fair Value
Within one year
$
371,218

$
372,541

 
$
75,748

$
74,416

After one year but within five years
1,227,734

1,229,254

 
268,855

280,504

After five years but within ten years
228,192

228,561

 
133,245

134,858

After ten years
248,970

249,838

 
51,594

45,367

Total
$
2,076,114

$
2,080,194

 
$
529,442

$
535,145