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GOODWILL AND OTHER INTANGIBLE ASSETS--Additional Information (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Aug. 30, 2019 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 0 | $ (800) | $ 0 | $ (790) | $ 0 | $ 63,000
Intangible assets amortization |  |  | 2,915 |  | $ 2,480 | $ 5,829 | $ 4,959 |
Core deposits |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Intangible assets amortization method |  |  |  |  |  | accelerated basis |  |
Estimated weighted average life (in years) |  |  |  |  |  | 5 years 8 months 12 days |  |
Customer lists |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Intangible assets amortization method |  |  |  |  |  | straight-line basis |  |
Estimated weighted average life (in years) | 12 years | 11 years |  |  |  |  |  |
Customer lists | Summit Funding Group |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net | $ 30,100 |  | 28,900 |  |  | $ 28,900 |  | 30,100
Customer lists | Bannockburn [Member] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Net | $ 31,100 |  | $ 29,300 |  |  | $ 29,300 |  | $ 31,100

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