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GOODWILL AND OTHER INTANGIBLES (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2020 |  | 2019
Balance at beginning of year | ​ | $ | 118,649 | ​ | $ | 100,085
Acquisition | ​ |  | 828 | ​ |  | 18,564
Balance at end of year | ​ | $ | 119,477 | ​ | $ | 118,649
Schedule of Finite-Lived Intangible Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020
​ | ​ | Gross | ​ | Accumulated | ​ | Net Intangible
(in thousands) |  | Intangible Assets |  | Amortization |  | Assets
Core deposit intangible (non-maturity deposits) | ​ | $ | 9,305 | ​ | $ | (3,287) | ​ | $ | 6,018
Customer list and other intangibles | ​ |  | 1,901 | ​ |  | (249) | ​ |  | 1,652
Total | ​ | $ | 11,206 | ​ | $ | (3,536) | ​ | $ | 7,670
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2019
​ | ​ | Gross | ​ | Accumulated | ​ | Net Intangible
(in thousands) |  | Intangible Assets |  | Amortization |  | Assets
Core deposit intangible (non-maturity deposits) | ​ | $ | 9,483 | ​ | $ | (2,635) | ​ | $ | 6,848
Customer list and other intangibles | ​ |  | 2,065 | ​ |  | (272) | ​ |  | 1,793
Total | ​ | $ | 11,548 | ​ | $ | (2,907) | ​ | $ | 8,641
Schedule of Future Amortization Expense | ​
​ | ​ | ​ | ​
​ | ​ | Other Intangible
(in thousands) |  | Assets
2021 | ​ | $ | 934
2022 | ​ |  | 932
2023 | ​ |  | 932
2024 | ​ |  | 932
2025 | ​ |  | 932
and thereafter | ​ |  | 3,008
Total | ​ | $ | 7,670

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