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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2021
GOODWILL AND OTHER INTANGIBLE ASSETS |
Schedule of core deposit intangibles | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) |  | September 30, |  | December 31,
​ | ​ | 2021 | ​ | 2020
Gross amount | ​ | $ | 6,639 | ​ | $ | 6,639
Accumulated amortization | ​ |  | (3,189) | ​ |  | (2,788)
Net | ​ | $ | 3,450 | ​ | $ | 3,851
Schedule of amortization expense related to core deposit intangibles is included in other noninterest expense in the consolidated statements of income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) | ​ | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Amortization expense | ​ | $ | 133 |  | $ | 208 |  | $ | 401 |  | $ | 332
​
Schedule of changes in the carrying amount of goodwill | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(In Thousands) | Three Months Ended | ​ | Nine Months Ended
​ | September 30, | ​ | September 30, | ​ | September 30, | ​ | September 30,
​ | 2021 | ​ | 2020 | ​ | 2021 | ​ | 2020
Balance, beginning of period | $ | 52,505 | ​ | $ | 28,388 | ​ | $ | 52,505 | ​ | $ | 28,388
Goodwill arising in business combination | ​ | 0 | ​ | ​ | 24,138 | ​ | ​ | 0 | ​ | ​ | 24,138
Balance, end of period | $ | 52,505 | ​ | $ | 52,526 | ​ | $ | 52,505 | ​ | $ | 52,526

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