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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Accumulated amortization of 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.
 
March 31, 2016
 
Gross Carrying
 
Accumulated
 
Net Carrying
(In thousands)
Amount
 
Amortization
 
Amount
Core deposit intangibles (1)
$
82,323

 
$
(30,194
)
 
$
52,129

Lease intangible
238

 
(220
)
 
18

Trust Relationships (2)
14,000

 
(7,823
)
 
6,177

 
$
96,561

 
(38,237
)
 
$
58,324

 
 
 
 
 
 
 
December 31, 2015
 
Gross Carrying
 
Accumulated
 
Net Carrying
(In thousands)
Amount
 
Amortization
 
Amount
Core deposit intangibles (1)
$
82,323

 
$
(28,304
)
 
$
54,019

Lease intangible
238

 
(212
)
 
26

Trust Relationships (2)
14,000

 
(7,417
)
 
6,583

 
$
96,561

 
(35,933
)
 
$
60,628

 
 
 
 
 
 
 
March 31, 2015
 
Gross Carrying
 
Accumulated
 
Net Carrying
(In thousands)
Amount
 
Amortization
 
Amount
Core deposit intangibles (1)
$
82,323

 
$
(22,073
)
 
$
60,250

Lease intangible
238

 
(185
)
 
53

Trust relationships (2)
14,000

 
(5,881
)
 
8,119

 
$
96,561

 
(28,139
)
 
$
68,422

 
 
 
 
 
 

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