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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2013
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:
March 31, 2013
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Available-for-Sale:
 
 
 
 
Obligations of U.S. government agencies
$
777,044

$
3,220

$
(342
)
$
779,922

U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
1,210,425

23,814

(3,501
)
1,230,738

Private mortgage-backed securities
495

15

(1
)
509

Total
$
1,987,964

$
27,049

$
(3,844
)
$
2,011,169

March 31, 2013
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Held-to Maturity:
 
 
 
 
State, county and municipal securities
$
192,241

$
9,881

$
(282
)
$
201,840

Corporate securities
18,185

96

(6
)
18,275

Total
$
210,426

$
9,977

$
(288
)
$
220,115


December 31, 2012
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Available-for-Sale:
 
 
 
 
Obligations of U.S. government agencies
$
751,501

$
3,518

$
(163
)
$
754,856

U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
1,214,377

27,000

(1,526
)
1,239,851

Private mortgage-backed securities
539

13

(1
)
551

Total
$
1,966,417

$
30,531

$
(1,690
)
$
1,995,258

December 31, 2012
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Held-to Maturity:
 
 
 
 
State, county and municipal securities
$
192,875

$
10,835

$
(176
)
$
203,534

Corporate securities
14,975

64

(13
)
15,026

Other securities
373

—

—

373

Total
$
208,223

$
10,899

$
(189
)
$
218,933
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 March 31,
 
2013
2012
Gross realized gains
$
8

$
31

Gross realized losses
—

—
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 March 31, 2013 and December 31, 2012
 
Less than 12 Months
 
12 Months or More
 
Total
March 31, 2013
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Available-for-Sale:
 
 
 
 
 
 
 
 
Obligations of U.S. government agencies
$
182,957

$
(342
)
 
$
—

$
—

 
$
182,957

$
(342
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
365,181

(3,501
)
 
—

—

 
365,181

(3,501
)
Private mortgage-backed securities
—

—

 
125

(1
)
 
125

(1
)
Total
$
548,138

$
(3,843
)
 
$
125

$
(1
)
 
$
548,263

$
(3,844
)
 
Less than 12 Months
 
12 Months or More
 
Total
March 31, 2013
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Held-to-Maturity:
 
 
 
 
 
 
 
 
State, county and municipal securities
$
24,188

$
(276
)
 
$
525

$
(6
)
 
$
24,713

$
(282
)
Corporate securities
3,239

(6
)
 
—

—

 
3,239

(6
)
Total
$
27,427

$
(282
)
 
$
525

$
(6
)
 
$
27,952

$
(288
)

 
Less than 12 Months
 
12 Months or More
 
Total
December 31, 2012
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Available-for-Sale:
 
 
 
 
 
 
 
 
Obligations of U.S. government agencies
$
93,982

$
(163
)
 
$
—

$
—

 
$
93,982

$
(163
)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations
250,198

(1,526
)
 
—

—

 
250,198

(1,526
)
Private mortgage-backed securities
—

—

 
137

(1
)
 
137

(1
)
Total
$
344,180

$
(1,689
)
 
$
137

$
(1
)
 
$
344,317

$
(1,690
)
 
Less than 12 Months
 
12 Months or More
 
Total
December 31, 2012
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
 
Fair
Value
Gross
Unrealized
Losses
Held-to-Maturity:
 
 
 
 
 
 
 
 
State, county and municipal securities
$
19,389

$
(168
)
 
$
557

$
(8
)
 
$
19,946

$
(176
)
Corporate securities
9,312

(13
)
 
—

—

 
9,312

(13
)
Total
$
28,701

$
(181
)
 
$
557

$
(8
)
 
$
29,258

$
(189
)
Maturities of Investment Securities
Maturities of investment securities at March 31, 2013 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
March 31, 2013
Amortized
Cost
Estimated
Fair Value
 
Amortized
Cost
Estimated
Fair Value
Within one year
$
400,147

$
405,641

 
$
3,877

$
3,925

After one year but within five years
1,127,952

1,141,233

 
52,321

53,266

After five years but within ten years
375,101

378,108

 
86,803

90,886

After ten years
84,764

86,187

 
67,425

72,038

Total
$
1,987,964

$
2,011,169

 
$
210,426

$
220,115