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Goodwill and Other Intangible Assets
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
GOODWILL AND OTHER INTANGIBLE ASSETS
Goodwill and other intangible assets arise from the acquisition method of accounting for business combinations. Goodwill and other intangible assets generated from business combinations and deemed to have indefinite lives are not subject to amortization and instead are tested for impairment at least annually. Goodwill represents the excess of the purchase price over the fair value of the net assets and other identifiable intangible assets acquired. Impairment exists when the carrying value of the goodwill exceeds its implied fair value. An impairment loss would be recognized in an amount equal to that excess as a charge to "Noninterest expense" in the condensed consolidated statements of earnings.
Our other intangible assets with definite lives include CDI and CRI. 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 September 30, 2017 is 4.7 years and the aggregate amortization expense is expected to be $11.5 million for 2017. The estimated aggregate amortization expense related to these intangible assets for each of the next five years is $8.8 million for 2018, $6.7 million for 2019, $4.7 million for 2020, $3.0 million for 2021, and $1.7 million for 2022.
The following table presents the changes in CDI and CRI and the related accumulated amortization for the periods indicated:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
June 30,
 
September 30,
 
September 30,
 
2017
 
2017
 
2016
 
2017
 
2016
 
(In thousands)
Gross Amount of CDI and CRI:
 
 
 
 
 
 
 
 
 
Balance, beginning of period
$
64,187

 
$
64,187

 
$
76,513

 
$
64,187

 
$
95,524

Fully amortized portion
(2,190
)
 

 
(2,811
)
 
(2,190
)
 
(20,122
)
Reduction due to sale of PWEF leasing unit

 

 

 

 
(1,700
)
Balance, end of period
61,997

 
64,187

 
73,702

 
61,997

 
73,702

Accumulated Amortization:
 
 
 
 
 
 
 
 
 
Balance, beginning of period
(33,950
)
 
(30,885
)
 
(32,747
)
 
(27,821
)
 
(42,304
)
Amortization
(3,049
)
 
(3,065
)
 
(4,224
)
 
(9,178
)
 
(13,341
)
Fully amortized portion
2,190

 

 
2,811

 
2,190

 
20,122

Reduction due to sale of PWEF leasing unit

 

 

 

 
1,363

Balance, end of period
(34,809
)
 
(33,950
)
 
(34,160
)
 
(34,809
)
 
(34,160
)
Net CDI and CRI, end of period
$
27,188

 
$
30,237

 
$
39,542

 
$
27,188

 
$
39,542