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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Other Intangible Assets [Abstract] |
Schedule of Components of Goodwill and Other Acquired Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | Gross | ​ | Accumulated | ​ | ​ | ​ | ​ | Net | ​ | Average
​ | ​ | Carrying | ​ | Impairment | ​ | Accumulated | ​ | Carrying | ​ | Remaining Life
(Dollars in thousands) |  | Amount |  | Charges |  | Amortization |  | Amount | ​ | (in years)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Goodwill | ​ | $ | 19,728 | ​ | $ | (1,543) | ​ | $ | (667) | ​ | $ | 17,518 | ​ | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other intangible assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortizable | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Core deposit intangible | ​ | $ | 3,954 | ​ | $ | — | ​ | $ | (2,235) | ​ | $ | 1,719 | ​ | ​ | 4.7
Total other intangible assets | ​ | $ | 3,954 | ​ | $ | — | ​ | $ | (2,235) | ​ | $ | 1,719 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ |  | Gross |  | ​ | Accumulated | ​ | ​ | ​ |  | Net | ​ | Average
​ |  | Carrying |  | Impairment |  | ​ | Accumulated |  | Carrying | ​ | Remaining Life
(Dollars in thousands) |  | Amount |  | Charges |  | ​ | Amortization |  | Amount | ​ | (in years)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Goodwill | ​ | $ | 19,728 | ​ | $ | (1,543) | ​ | $ | (667) | ​ | $ | 17,518 | ​ | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Other intangible assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortizable | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Core deposit intangible | ​ | $ | 3,954 | ​ | $ | — | ​ | $ | (1,702) | ​ | $ | 2,252 | ​ |  | 5.7
Total other intangible assets | ​ | $ | 3,954 | ​ | $ | — | ​ | $ | (1,702) | ​ | $ | 2,252 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Future Amortization Expense for Amortizable Other Intangible Assets | ​
​ | ​ | ​ | ​
(Dollars in thousands) | ​ | Amortization Expense
2021 | ​ | $ | 461
2022 | ​ |  | 389
2023 | ​ |  | 317
2024 | ​ |  | 246
2025 | ​ |  | 174
Thereafter | ​ | ​ | 132
Total amortizing intangible assets | ​ | $ | 1,719

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