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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

Goodwill

Goodwill totaled $734.9 million as of September 30, 2013, and $460.0 million as of December 31, 2012 and September 30, 2012. As discussed in Note 2 (Business Combinations), the Corporation recorded $274.8 million of provisional goodwill in the three months ended June 30, 2013 in connection with the acquisition of Citizens. As of September 30, 2013, the additional goodwill remains unallocated to the Corporation’s reporting units due to the provisional nature of the fair value measurements.

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.
 
September 30, 2013
 
Gross Carrying
 
Accumulated
 
Net Carrying
 
Amount
 
Amortization
 
Amount
Core deposit intangibles
$
87,533

 
$
(14,325
)
 
$
73,208

Non-compete covenant
102

 
(96
)
 
6

Lease intangible
618

 
(511
)
 
107

Trust relationships
14,000

 
(1,874
)
 
12,126

 
$
102,253

 
$
(16,806
)
 
$
85,447

 
 
 
 
 
 
 
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

 
 
 
 
 
 
 
September 30, 2012
 
Gross Carrying
 
Accumulated
 
Net Carrying
 
Amount
 
Amortization
 
Amount
Core deposit intangibles
$
16,759

 
$
(10,117
)
 
$
6,642

Non-compete covenant
102

 
(70
)
 
32

Lease intangible
618

 
(475
)
 
143

 
$
17,479

 
$
(10,662
)
 
$
6,817



Core deposit intangibles comprise the majority of the intangible asset total as of September 30, 2013. As discussed in Note 2 (Business Combinations ), the Corporation recorded approximately $84.8 million of intangible assets in connection with its acquisition with Citizens. These assets consist of $70.8 million in core deposit intangibles which are being amortized on an accelerated basis over their useful lives of 15 years, and $14.0 million in trust relationship intangibles that are being amortized on an accelerated basis over their useful lives of 12 years. The remaining core deposit intangibles were acquired through various prior acquisitions and are being amortized on an accelerated basis over their useful lives of 10 years.

Amortization expense for intangible assets was $3.0 million and $5.7 million in the three and nine months ended September 30, 2013, respectively, compared to $0.5 million and $1.4 million in the three and nine months ended September 30, 2012, respectively. Estimated amortization expense for each of the next five years is as follows: 2013 - $2.7 million; 2014 - $11.7 million; 2015 - $10.4 million; 2016 - $9.2 million; and 2017 - $8.2 million.