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Other Intangible Assets and Goodwill
 12 Months Ended
Dec. 31, 2022
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,
2022		December 31,
2021		December 31,
2020
Gross carrying value$95,120 95,120 88,099 
Accumulated amortization(53,519)(42,861)(32,590)
Net carrying value$41,601 52,259 55,509 
Aggregate amortization expense$10,658 10,271 10,370 
Estimated amortization expense for the years ending December 31,
2023$9,731 
20248,815 
20257,611 
20266,561 
20275,603 

Core deposit intangibles increased $0, $7,021,000 and $2,593,000 during 2022, 2021 and 2020, 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,
2022		December 31,
2021		December 31,
2020
Net carrying value at beginning of period$985,393 514,013 456,418 
Acquisitions and adjustments— 471,380 57,595 
Net carrying value at end of period$985,393 985,393 514,013 
 
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 2022 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 2022 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, 2022. 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, 2022 and 2021.