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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2019
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | Note 7—Goodwill and Other Intangible Assets In accordance with FASB ASC 350, Intangibles—Goodwill and Other, the Company ceased amortization of goodwill as of January 1, 2002. The Company evaluated the carrying value of goodwill as of April 30, 2019, its annual test date, and determined that no impairment charge was necessary. The following is a summary of changes in the carrying amounts of goodwill: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended |
​ | ​ | December 31, |
(Dollars in thousands) | ​ | 2019 | ​ | 2018 |
Balance at beginning of period |  | $ | 1,002,900 |  | $ | 999,586 | ​
Additions: | ​ | ​ | ​ | ​ | ​ | ​ | ​
PSC acquisition Day 1 adjustment | ​ |  | — | ​ | ​ | 3,314 | ​
Balance at end of period | ​ | $ | 1,002,900 | ​ | $ | 1,002,900 | ​
​ The Company’s 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: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | December 31, |
(Dollars in thousands) |  | ​ | 2019 | ​ | 2018 |
Gross carrying amount | ​ |  | $ | 119,501 |  | $ | 121,736 | ​
Accumulated amortization | ​ | ​ |  | (69,685) | ​ |  | (58,836) | ​
​ | ​ | ​ | $ | 49,816 | ​ | $ | 62,900 | ​
​ ​ Amortization expense totaled $13.1 million, $14.2 million and $10.4 million for the years ended December 31, 2019, 2018, and 2017, respectively. Other intangibles are amortized using either the straight-line method or an accelerated basis over their estimated useful lives, with lives generally between 2 and 15 years. Estimated amortization expense for other intangibles for each of the next five years is as follows: ​
​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | ​ | ​ | ​
Year ended December 31: |  | ​ |  | ​
2020 | ​ | $ | 11,867 | ​
2021 | ​ |  | 10,584 | ​
2022 | ​ |  | 9,266 | ​
2023 | ​ |  | 6,314 | ​
2024 | ​ |  | 3,940 | ​
Thereafter | ​ |  | 7,845 | ​
​ | ​ | $ | 49,816 | ​
​ | ​ | ​ | ​ | ​
​

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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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