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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Other Intangible Assets | (6) Goodwill and Other Intangible Assets The majority of our identified intangibles are in the form of amortizable core deposit premium. A small portion of the fully amortized identified intangibles represent identified intangibles in the acquisition of the rights to the insurance agency contracts of InsCorp, Inc., acquired in 2008. Information on our identified intangible assets follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Carrying | ​ | Accumulated | ​ | ​ | ​ |
​ | ​ | Amount | ​ | Amortization | ​ | Net |
​ | ​ | (Dollars in Thousands) |
December 31, 2020: |  | ​ |  |  | ​ |  |  | ​ |  | ​
Core deposit premium | ​ | $ | 58,675 | ​ | $ | 58,675 | ​ | $ | — | ​
Identified intangible (contract rights) | ​ |  | 2,022 | ​ |  | 2,022 | ​ |  | — | ​
Total identified intangibles | ​ | $ | 60,697 | ​ | $ | 60,697 | ​ | $ | — | ​
December 31, 2019: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Core deposit premium | ​ | $ | 58,675 | ​ | $ | 58,675 | ​ | $ | — | ​
Identified intangible (contract rights) | ​ |  | 2,022 | ​ |  | 2,022 | ​ |  | — | ​
Total identified intangibles | ​ | $ | 60,697 | ​ | $ | 60,697 | ​ | $ | — | ​
​ Amortization expense of intangible assets was $0, $0 and $0 for the years ended December 31, 2020, 2019 and 2018. There were no changes in the carrying amount of goodwill for the years ended December 31, 2020 and 2019.

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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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