Intangible Assets

12 Months Ended

Dec. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Business Combinations

Unamortized Intangible Assets (Goodwill)

COB conducted an annual goodwill impairment test as of September 30, 2015, and determined there was no impairment to goodwill. The goodwill relates to the Granite acquisition. At December 31, 2015 and 2014, the gross and net balance of goodwill was $4.2 million, and there were no additions or impairment to goodwill during the years ended December 31, 2015, 2014 and 2013.

Amortized Intangible Assets

Core Deposit Premium ("CDP")

For intangible assets related to business combinations, the following is a summary of the gross carrying amount and accumulated amortization of amortized intangible assets and the carrying amount of unamortized intangible assets:



(dollars in thousands)	As of December 31,
	2015		2014
Core deposit premium related to business combinations:
Carrying amount	$	13,546	$	13,102
Accumulated amortization	10,569		9,147
Net core deposit premium	$	2,977	$	3,955

During the third quarter we finalized the acquisition accounting for the CertusBank, N.A. branch acquisition and recorded a bargain purchase gain in other income of $0.3 million, representing the excess of the net fair value of assets acquired and liabilities assumed over the purchase price.

Amortization of CDP intangibles totaled $1.4 million in 2015, $1.4 million in 2014 and $1.4 million in 2013.

The following table presents the estimated amortization expense for intangible assets related to business combinations for each of the five calendar years ending December 31, 2019 and the estimated amount amortizable thereafter. These estimates are subject to change in future periods to the extent management determines it is necessary to make adjustments to the carrying value or estimated useful lives of amortized intangible assets.



(dollars in thousands)	Estimated Amortization Expense
2016	$	908
2017	685
2018	685
2019	583
2020	73
Thereafter	43
Total	$	2,977

Mortgage Servicing Rights

Mortgage loans serviced for others are not included in the consolidated balance sheets. The unpaid principal balance of mortgage loans serviced for others amounted to $304.6 million and $235.0 million at December 31, 2015 and 2014, respectively, and the fair value of mortgage servicing rights was $2.2 million and $1.7 million as of the same dates.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

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