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Goodwill and Other Intangible Assets | 3 Months Ended
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Mar. 31, 2021
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | Note 19 — Goodwill and Other Intangible Assets ​ The carrying amount of goodwill was $1.6 billion at both March 31, 2021 and December 31, 2020. The Company added $15.8 million in goodwill related to the DWI acquisition in the first quarter of 2021. ​ The Company completed its annual valuation of the carrying value of its goodwill as of April 30, 2020. We also updated our analysis at November 30, 2020. We determined that no impairment charge was necessary for each period end. We will continue to monitor the impact of the COVID-19 pandemic on the Company’ business, operating results, cash flows and/or financial condition. ​ Our other intangible assets, consisting of core deposit intangibles, noncompete intangibles, and client list intangibles are included on the face of the balance sheet. The following is a summary of gross carrying amounts and accumulated amortization of other intangible assets: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31, | ​
(Dollars in thousands) |  | 2021 |  | 2020 |
Gross carrying amount | ​ | $ | 258,654 | ​ | $ | 258,554 | ​
Accumulated amortization | ​ |  | (104,793) | ​ |  | (95,962) | ​
​ | ​ | $ | 153,861 | ​ | $ | 162,592 | ​
​ Amortization expense totaled $9.2 million, for the three months ended March 31, 2021, compared to $3.0 million for the three months ended March 31, 2020. The increase compared to the three months ended March 31, 2020 was due to the intangibles added from the CSFL merger in the second quarter of 2020. Other intangibles are amortized using either the straight-line method or an accelerated basis over their estimated useful lives, with lives generally between two and 15 years. Estimated amortization expense for other intangibles for each of the next five quarters is as follows: ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | ​ | ​ | ​
Quarter ending: |  | ​ |  |
June 30,2021 | ​ | $ | 8,613 | ​
September 30,2021 | ​ |  | 8,201 | ​
December 31,2021 | ​ |  | 8,200 | ​
March 31,2022 | ​ |  | 7,931 | ​
June 30,2022 | ​ | ​ | 7,666 | ​
Thereafter | ​ |  | 113,250 | ​
​ | ​ | $ | 153,861 | ​
​

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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