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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Disclosure
Goodwill and Other Intangible Assets
Goodwill arises from the acquisition method of accounting for business combinations and represents the excess of the purchase price over the fair value of the net assets and other identifiable intangible assets acquired. Our intangible assets with definite lives are core deposit intangibles ("CDI") and customer relationship intangibles ("CRI").
Goodwill and other intangible assets deemed to have indefinite lives generated from business combinations are not subject to amortization and are instead tested for impairment no less than annually. Impairment exists when the carrying value of goodwill exceeds its implied fair value. An impairment loss would be recognized in an amount equal to that excess and would be included in “Noninterest expense” in the condensed consolidated statements of earnings.
CDI and CRI are amortized over their respective estimated useful lives and reviewed for impairment at least quarterly. The amortization expense represents the estimated decline in the value of the underlying deposits or loan and lease customers acquired. The weighted average amortization period remaining for all of our CDI and CRI as of March 31, 2016 is 6.0 years. The aggregate CDI and CRI amortization expense is expected to be $16.1 million for 2016. The estimated aggregate amortization expense related to these intangible assets for each of the next five years is $11.5 million for 2017, $8.8 million for 2018, $6.7 million for 2019, $4.7 million for 2020, and $3.0 million for 2021.
The following table presents the changes in the carrying amount of goodwill for the period indicated:    
 
Goodwill
 
(In thousands)
Balance, December 31, 2015
$
2,176,291

Reduction due to sale of PWEF leasing unit
(500
)
Balance, March 31, 2016
$
2,175,791


Through the sale of the PWEF leasing unit, $500,000 of goodwill was allocated to this business group; such goodwill reduction is included in the loss on sale of the PWEF leasing unit and included in "Other income" in the condensed consolidated statement of earnings.
The following table presents the changes in CDI and CRI and the related accumulated amortization for the periods indicated:
 
Three Months Ended
 
March 31,
 
December 31,
 
March 31,
 
2016
 
2015
 
2015
 
(In thousands)
Gross Amount of CDI and CRI:
 
 
 
 
 
Balance, beginning of period
$
95,524

 
$
53,090

 
$
53,090

Additions

 
45,426

 

Fully amortized portion

 
(2,992
)
 

Reduction due to sale of PWEF leasing unit
(1,700
)
 

 

Balance, end of period
93,824

 
95,524

 
53,090

Accumulated Amortization:
 
 
 
 
 
Balance, beginning of period
(42,304
)
 
(40,386
)
 
(35,886
)
Amortization
(4,746
)
 
(4,910
)
 
(1,501
)
Fully amortized portion

 
2,992

 

Reduction due to sale of PWEF leasing unit
1,363

 

 

Balance, end of period
(45,687
)
 
(42,304
)
 
(37,387
)
Net CDI and CRI, end of period
$
48,137

 
$
53,220

 
$
15,703