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Other Intangible Assets and Goodwill
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets and Goodwill Other Intangible Assets and Goodwill
The following table sets forth information regarding the Company’s core deposit intangibles:

 At or for the Years ended
(Dollars in thousands)December 31,
2019		December 31,
2018		December 31,
2017
Gross carrying value$85,506  62,977  21,649  
Accumulated amortization(22,220) (13,735) (7,465) 
Net carrying value$63,286  49,242  14,184  
Aggregate amortization expense$8,485  6,270  2,494  
Estimated amortization expense for the years ending December 31,
2020$9,978  
20219,519  
20229,029  
20238,276  
20247,535  

Core deposit intangibles increased $22,529,000, $41,328,000 and $4,331,000 during 2019, 2018 and 2017, respectively, due to acquisitions. For additional information relating to acquisitions, see Note 22.

The following schedule discloses the changes in the carrying value of goodwill:

 Years ended
(Dollars in thousands)December 31,
2019		December 31,
2018		December 31,
2017
Net carrying value at beginning of period$289,586  177,811  147,053  
Acquisitions and adjustments166,832  111,775  30,758  
Net carrying value at end of period$456,418  289,586  177,811  
 
The Company’s first step in evaluating goodwill for possible impairment is a control premium analysis. The analysis first calculates the market capitalization and then adjusts such value for a control premium range which results in an implied fair value. The control premium range is determined based on historical control premiums for acquisitions that are comparable to the Company and is obtained from an independent third party. The calculated implied fair value is then compared to the book value to determine whether the Company needs to proceed to step two of the goodwill impairment assessment. The Company performed its annual goodwill impairment test during the third quarter of 2019 and determined the fair value of the aggregated reporting units exceeded the carrying value, such that the Company’s goodwill was not considered impaired. In recognition there were no events or circumstances that occurred during the fourth quarter of 2019 that would more-likely-than-not reduce the fair value of a reporting unit below its carrying value, the Company did not perform interim testing at December 31, 2019. Changes in the economic environment, operations of the aggregated reporting units, or other factors could result in the decline in the fair value of the aggregated reporting units which could result in a goodwill impairment in the future. Accumulated impairment charges were $40,159,000 as of December 31, 2019 and 2018.