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GOODWILL AND OTHER INTANGIBLE ASSETS--Schedule of Other Intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | $ 100,597 | $ 100,564
Finite-Lived Intangible Assets, Accumulated Amortization | $ (38,613) | (36,012)
Core deposits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets amortization method | accelerated basis |
Finite-Lived Intangible Assets, Gross | $ 51,031 | 51,031
Finite-Lived Intangible Assets, Accumulated Amortization | $ (28,834) | (27,524)
Customer lists |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets amortization method | straight-line basis |
Finite-Lived Intangible Assets, Gross | $ 39,420 | 39,420
Finite-Lived Intangible Assets, Accumulated Amortization | (5,674) | (4,778)
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Gross | 10,146 | 10,113
Finite-Lived Intangible Assets, Accumulated Amortization | $ (4,105) | $ (3,710)

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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