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Investment Securities (Tables)
12 Months Ended
Dec. 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:
December 31, 2013
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Available-for-Sale
 
 
 
 
Obligations of U.S. government agencies
$
774,055

$
1,432

$
(12,249
)
$
763,238

U.S. agency residential mortgage-backed securities &
   collateralized mortgage obligations
1,197,295

11,905

(25,147
)
1,184,053

Private mortgage-backed securities
407

9

(1
)
415

Total
$
1,971,757

$
13,346

$
(37,397
)
$
1,947,706

December 31, 2013
Amortized
Cost
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Estimated
Fair
Value
Held-to Maturity
 
 
 
 
State, county and municipal securities
$
185,818

$
4,043

$
(2,049
)
$
187,812

Corporate securities
18,019

103

(8
)
18,114

Total
$
203,837

$
4,146

$
(2,057
)
$
205,926



Gross gains of $49 and gross losses of $48 were realized on the disposition of available-for-sale securities in 2013.
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

Gross Unrealized Losses and Fair Values of Investment Securities
The following table shows 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, 2013 and 2012.
 
Less than 12 Months
12 Months or More
Total
December 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
$
458,385

$
(10,355
)
$
59,362

$
(1,894
)
$
517,747

$
(12,249
)
U.S. agency residential mortgage-backed
   securities & collateralized mortgage
   obligations
634,199

(17,273
)
166,930

(7,874
)
801,129

(25,147
)
Private mortgage-backed securities


104

(1
)
104

(1
)
Total
$
1,092,584

$
(27,628
)
$
226,396

$
(9,769
)
$
1,318,980

$
(37,397
)
 
Less than 12 Months
12 Months or More
Total
December 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
$
37,550

$
(1,319
)
$
14,296

$
(730
)
$
51,846

$
(2,049
)
Corporate securities
7,294

(8
)


7,294

(8
)
Total
$
44,844

(1,327
)
14,296

(730
)
59,140

(2,057
)
 
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
All other investment securities maturities are shown at contractual maturity dates.
 
Available-for-Sale
 
Held-to-Maturity
December 31, 2013
Amortized
Cost
Estimated
Fair Value
 
Amortized
Cost
Estimated
Fair Value
Within one year
$
263,280

$
261,054

 
$
4,190

$
4,244

After one year but within five years
1,223,138

1,211,243

 
57,860

58,494

After five years but within ten years
401,500

392,496

 
87,703

89,168

After ten years
83,839

82,913

 
54,084

54,020

Total
$
1,971,757

$
1,947,706

 
$
203,837

$
205,926