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GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Other Intangibles (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 96,891 | $ 100,564
Finite-Lived Intangible Assets, Accumulated Amortization | (40,080) | (36,012)
Core deposits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 47,325 | 51,031
Finite-Lived Intangible Assets, Accumulated Amortization | (27,748) | (27,524)
Customer lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 39,420 | 39,420
Finite-Lived Intangible Assets, Accumulated Amortization | (7,466) | (4,778)
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 10,146 | 10,113
Finite-Lived Intangible Assets, Accumulated Amortization | $ (4,866) | $ (3,710)

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