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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets

Goodwill

Goodwill totaled $460.0 million as of March 31, 2013, December 31, 2012 and March 31, 2012. Goodwill is not amortized but is evaluated for impairment on an annual basis at November 30 of each year or whenever events or changes in circumstances indicate the carrying value may not be recoverable. No events or circumstances since the November 30, 2012 annual impairment test were noted that would indicate it was more likely than not a goodwill impairment exists.
    
Other Intangible Assets

The following tables show the gross carrying amount and the amount of accumulated amortization of intangible assets subject to amortization.
 
March 31, 2013
 
Gross Carrying
 
Accumulated
 
Net Carrying
 
Amount
 
Amortization
 
Amount
Core deposit intangibles
$
16,759

 
$
(10,848
)
 
$
5,911

Non-compete covenant
102

 
(83
)
 
19

Lease intangible
618

 
(493
)
 
125

 
$
17,479

 
$
(11,424
)
 
$
6,055

 
 
 
 
 
 
 
December 31, 2012
 
Gross Carrying
 
Accumulated
 
Net Carrying
 
Amount
 
Amortization
 
Amount
Core deposit intangibles
16,759

 
(10,546
)
 
6,213

Non-compete covenant
102

 
(76
)
 
26

Lease intangible
$
618

 
$
(484
)
 
$
134

 
$
17,479

 
$
(11,106
)
 
$
6,373

 
 
 
 
 
 
 
March 31, 2012
 
Gross Carrying
 
Accumulated
 
Net Carrying
 
Amount
 
Amortization
 
Amount
Core deposit intangibles
$
16,759

 
$
(9,246
)
 
$
7,513

Non-compete covenant
102

 
(70
)
 
32

Lease intangible
618

 
(407
)
 
211

 
$
17,479

 
$
(9,723
)
 
$
7,756



Core deposit intangibles comprise the majority of the intangible asset total as of March 31, 2013. Core deposit intangibles were acquired through various acquisitions and are amortized on an accelerated basis over their useful lives of 10 years.

Amortization expense for intangible assets was $0.3 million in the three months ended March 31, 2013 and $0.5 million in the three months ended March 31, 2012. Estimated amortization expense for each of the next five years is as follows: 2013 - $0.9 million; 2014 - $1.1 million; 2015 - $1.0 million; 2016 - $0.9 million; and 2017 - $0.8 million.