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GOODWILL AND OTHER INTANGIBLE ASSETS
12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
GOODWILL AND OTHER INTANGIBLE ASSETS
NOTE 10 GOODWILL AND OTHER INTANGIBLE ASSETS
    
Goodwill

Total goodwill remained unchanged as of December 31, 2015 compared with December 31, 2014. Goodwill is tested for impairment on an annual basis as of December 31st, or more frequently as events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company’s three operating segments, Retail Banking, Commercial Banking, and Other, are equivalent to the Company’s reporting units. For complete discussion and disclosure, please refer to Note 20 - Business Segments to the Consolidated Financial Statements. The following table presents the changes in the carrying amount of goodwill for segments with goodwill balances for the years ended December 31, 2015 and 2014:
 
($ in thousands)
 
Year Ended December 31,
 
2015
 
2014
 
Retail Banking
 
Commercial Banking
 
Total
 
Retail Banking
 
Commercial Banking
 
Total
Beginning balance
 
$
357,207

 
$
112,226

 
$
469,433

 
$
320,566

 
$
16,872

 
$
337,438

Addition from MetroCorp acquisition (1)
 

 

 

 
36,641

 
95,354

 
131,995

Ending balance
 
$
357,207

 
$
112,226

 
$
469,433

 
$
357,207

 
$
112,226

 
$
469,433

 
(1)
Includes $11.0 million of tax and BOLI adjustments recorded in the fourth quarter of 2014 due to the acquisition of MetroCorp, as discussed in Note 2 Business Combination to the Consolidated Financial Statements.

Impairment testing

The Company performed its annual impairment test as of December 31, 2015 to determine whether and to what extent, if any, recorded goodwill was impaired. The Company used an income approach or a combined income and market approach to determine the fair value of the reporting units. Under the income approach, the Company provided a net income projection for the next three years plus a terminal growth rate that was used to calculate the discounted cash flows and the present value of the reporting units. Under the market approach, the fair value was calculated using the current fair values of comparable peer banks of similar size, geographic footprint and focus. The market capitalizations and multiples of these peer banks were used to calculate the market price of the Company and each reporting unit. The fair value was also subject to a control premium adjustment, which represents the cost savings that a purchaser of the reporting units could achieve by eliminating duplicative costs. Under the combined income and market approaches, the fair value from each approach was weighted based on management’s perceived risk of each approach to determine the fair value. As a result of this analysis, the Company determined that there was no goodwill impairment as of December 31, 2015 as the fair values of all reporting units exceeded the current carrying amounts of the goodwill. No assurance can be given that goodwill will not be written down in future periods.
    
Premiums on Acquired Deposits

Premiums on acquired deposits represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions. These intangibles are tested for impairment on an annual basis, or more frequently as events occur, or as current circumstances and conditions warrant. There were no impairment write-downs on deposit premiums for the years ended December 31, 2015, 2014 and 2013.

The following table presents the gross carrying value of intangible assets and accumulated amortization for the years ended December 31, 2015 and 2014:
 
($ in thousands)
 
2015
 
2014
Gross balance
 
$
108,814

 
$
108,814

Accumulated amortization
 
72,739

 
63,505

Net carrying balance
 
$
36,075

 
$
45,309

 


Amortization Expense

The Company amortizes premiums on acquired deposits based on the projected useful lives of the related deposits. The amortization expense related to the intangible assets was $9.2 million, $10.2 million and $9.4 million for the years ended December 31, 2015, 2014 and 2013, respectively.

The following table presents the estimated future amortization expense of premiums on acquired deposits at December 31, 2015:
 
Year ended December 31,
 
Amount
 
 
($ in thousands)
2016
 
$
8,086

2017
 
6,935

2018
 
5,883

2019
 
4,864

2020
 
3,846

Thereafter
 
6,461

Total
 
$
36,075