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Goodwill and Other Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2021
Goodwill and Other Intangible Assets |
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 | ​
Schedule of estimated amortization expense for other intangibles for each of the next five quarters | ​
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
(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 Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding quarters for the finite-lived intangible assets. + References No definition available. + Details
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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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