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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of the entity's identified intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 | ​ | $ | — | ​

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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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