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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets

Goodwill

Goodwill totaled $741.7 million as of September 30, 2014, December 31, 2013, and September 30, 2013. 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, 2013 annual impairment test were noted that would indicate it was more likely than not a goodwill impairment exists.
    
Other Intangible Assets

The Corporation has other intangible assets that are amortized, consisting of core deposit intangibles, lease intangibles and trust relationship intangibles. The following tables show the gross carrying amount, accumulated amortization, and net carrying amount of these intangible assets.
 
September 30, 2014
 
Gross Carrying
 
Accumulated
 
Net Carrying
(In thousands)
Amount
 
Amortization
 
Amount
Core deposit intangibles (a)
$
82,323

 
$
(17,712
)
 
$
64,611

Lease intangible
238

 
(167
)
 
71

Trust Relationships (b)
14,000

 
(4,729
)
 
9,271

 
$
96,561

 
(22,608
)
 
$
73,953

 
 
 
 
 
 
 
December 31, 2013
 
Gross Carrying
 
Accumulated
 
Net Carrying
(In thousands)
Amount
 
Amortization
 
Amount
Core deposit intangibles (a)
$
87,533

 
$
(16,065
)
 
$
71,468

Non-compete covenant
102

 
(102
)
 

Lease intangible
238

 
(140
)
 
98

Trust Relationships (b)
14,000

 
(2,811
)
 
11,189

 
$
101,873

 
$
(19,118
)
 
$
82,755

 
 
 
 
 
 
 
September 30, 2013
 
Gross Carrying
 
Accumulated
 
Net Carrying
(In thousands)
Amount
 
Amortization
 
Amount
Core deposit intangibles (a)
$
87,533

 
$
(14,325
)
 
$
73,208

Non-compete covenant
102

 
(96
)
 
6

Lease intangible
238

 
(131
)
 
107

Trust relationships (b)
14,000

 
(1,874
)
 
12,126

 
$
101,873

 
$
(16,426
)
 
$
85,447

 
 
 
 
 
 

(a) Core deposit intangibles are amortized on an accelerated basis over their estimated useful lives which range from 10-15 years.
(b) Trust relationship intangibles are amortized on an accelerated basis on their estimated useful lives of 12 years.

Amortization expense for intangible assets was $8.8 million in the nine months ended September 30, 2014, compared to $5.7 million in the nine months ended September 30, 2013. Estimated amortization expense for each of the next five years is as follows: 2014 - $2.9 million; 2015 - $10.4 million; 2016 - $9.2 million; 2017 - $8.2 million; and 2018 - $7.3 million.