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Goodwill and intangibles (Notes)
6 Months Ended
Jun. 30, 2017
Acquired Finite-Lived Intangible Assets [Line Items]  
Goodwill and Intangible Assets Disclosure [Text Block]
(3)
Goodwill and Intangibles

The Company recorded $231.5 million of provisional goodwill in connection with the Cascade merger. In accordance with the Intangibles - Goodwill and Other topic of the Financial Accounting Standards Board (“FASB”) ASC 350, goodwill is not amortized but is reviewed for potential impairment at the reporting unit level. Management analyzes its goodwill for impairment on an annual basis and between annual tests in certain circumstances, such as upon material adverse changes in legal, business, regulatory and economic factors. An impairment loss is recorded to the extent that the carrying amount of goodwill exceeds its implied fair value. The Company performed an impairment assessment as of July 1, 2016 and 2015 and concluded that there was no impairment to goodwill.
Core deposit intangibles (“CDI”) are evaluated for impairment if events and circumstances indicate a possible impairment. The CDI are amortized using an accelerated method based on the estimated weighted average useful lives of the related deposits, which is ten years. The following table sets forth activity for CDI for the three and six months ended June 30, 2017 and 2016:
 
 
Three months ended
 
Six months ended
 
 
June 30,
 
June 30,
 
 
2017
 
2016
 
2017
 
2016
CDI, net, beginning of period
 
9,018

 
9,762

 
9,648

 
10,589

Established through acquisitions
 
47,950

 

 
47,950

 

Reductions due to sale of accounts
 
(3,069
)
 

 
(3,069
)
 

CDI current period amortization
 
(1,062
)
 
(827
)
 
(1,692
)
 
(1,654
)
Total CDI, net, at June 30
 
52,837

 
8,935

 
52,837

 
8,935



Subsequent to the acquisition of Cascade, the Company sold the custodial rights to the all of its Health Savings Account (HSA) portfolio, including HSA acquired from Cascade. The Company recognized no gain or loss on the sale of the acquired HSA as the excess of consideration received over HSA book value was recorded as reduction to CDI at the acquisition of Cascade.


The following table provides the estimated future CDI amortization expense:
Years Ending December 31,
 
 
 
2017 remaining
 
 
2,597

2018
 
 
5,093

2019
 
 
4,994

2020
 
 
4,872

2021
 
 
4,729

Thereafter
 
 
22,164