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GOODWILL AND OTHER INTANGIBLE ASSETS | 9 Months Ended
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Sep. 30, 2021
GOODWILL AND OTHER INTANGIBLE ASSETS |
GOODWILL AND OTHER INTANGIBLE ASSETS, NET | 8. GOODWILL AND OTHER INTANGIBLE ASSETS Information related to core deposit intangibles is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(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
​ Amortization expense related to core deposit intangibles is included in other noninterest expense in the consolidated statements of income, as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(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
​ Goodwill represents the excess of the cost of acquisitions over the fair value of the net assets acquired. At September 30, 2021 and December 31, 2020, the net carrying value of goodwill was $52,505,000. Changes in the carrying amount of goodwill are summarized in the following table: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(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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- Definition The entire disclosure for all or part of the information related to 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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