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Other Intangible Assets and Goodwill
 12 Months Ended
Dec. 31, 2020
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,
2020		December 31,
2019		December 31,
2018
Gross carrying value$88,099 85,506 62,977 
Accumulated amortization(32,590)(22,220)(13,735)
Net carrying value$55,509 63,286 49,242 
Aggregate amortization expense$10,370 8,485 6,270 
Estimated amortization expense for the years ending December 31,
2021$9,951 
20229,414 
20238,614 
20247,826 
20256,750 

Core deposit intangibles increased $2,593,000, $22,529,000 and $41,328,000 during 2020, 2019 and 2018, respectively, due to acquisitions. For additional information relating to acquisitions, see Note 23.

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

 Years ended
(Dollars in thousands)December 31,
2020		December 31,
2019		December 31,
2018
Net carrying value at beginning of period$456,418 289,586 177,811 
Acquisitions and adjustments57,595 166,832 111,775 
Net carrying value at end of period$514,013 456,418 289,586 
 
The Company evaluates goodwill for possible impairment utilizing 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 2020 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 2020 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, 2020. 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, 2020 and 2019.