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Goodwill and Other Intangible Assets
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets
NOTE 4.  GOODWILL AND OTHER INTANGIBLE ASSETS
The following table presents the changes in the carrying amount of goodwill for the years indicated:    
 
Goodwill
 
(In thousands)
Balance, December 31, 2014
$
1,720,479

Adjustment to acquired CapitalSource Inc. tax assets
7,901

Addition from the Square 1 acquisition
447,911

Balance, December 31, 2015
2,176,291

Adjustment to acquired Square 1 tax assets
(1,842
)
Reduction due to sale of PWEF leasing unit
(500
)
Balance, December 31, 2016
2,173,949

Addition from the CUB acquisition
374,721

Balance, December 31, 2017
$
2,548,670


Goodwill adjustments include: (1) the 2016 finalization of the fair value of the tax assets acquired in the Square 1 acquisition, (2) the 2016 reduction of goodwill in connection with the sale of the PWEF leasing unit, and (3) the 2015 finalization of the fair value of the tax assets acquired in the CapitalSource merger. The finalization of the day one fair value of the acquired Square 1 tax assets was due to completion of the 2015 tax returns. Through the sale of the PWEF leasing unit on March 31, 2016, $0.5 million of goodwill was allocated to this business group; as such, a goodwill reduction was included in the $0.7 million loss on sale of the PWEF leasing unit and included in "Other income" in the consolidated statements of earnings.
We perform our annual goodwill impairment testing in the fourth quarter. In the fourth quarter of 2017, we evaluated the carrying value of our goodwill and determined that it was not impaired.
Our other intangible assets with definite lives are 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 December 31, 2017 is 5.0 years. The estimated aggregate amortization expense related to these intangible assets for each of the next five years is $24.4 million for 2018, $19.6 million for 2019, $15.3 million for 2020, $11.7 million for 2021 and $7.9 million for 2022.
The following table presents the changes in CDI and CRI and the related accumulated amortization for the years indicated:
 
Year Ended December 31,
 
2017
 
2016
 
2015
 
(In thousands)
Gross Amount of CDI and CRI:
 
 
 
 
 
Balance, beginning of year
$
64,187

 
$
95,524

 
$
53,090

Additions due to acquisitions
57,500

 

 
45,426

Fully amortized portion
(2,190
)
 
(29,637
)
 
(2,992
)
Reduction due to sale of PWEF leasing unit

 
(1,700
)
 

Balance, end of year
119,497

 
64,187

 
95,524

Accumulated Amortization:
 
 
 
 
 
Balance, beginning of year
(27,821
)
 
(42,304
)
 
(35,886
)
Amortization
(14,240
)
 
(16,517
)
 
(9,410
)
Fully amortized portion
2,190

 
29,637

 
2,992

Reduction due to sale of PWEF leasing unit

 
1,363

 

Balance, end of year
(39,871
)
 
(27,821
)
 
(42,304
)
Net CDI and CRI, end of year
$
79,626

 
$
36,366

 
$
53,220