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GOODWILL AND INTANGIBLE ASSETS (Information Concerning Intangible Assets with Finite Life) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Total estimated amortization expense | $ 57,185,000 |
Core Deposits |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 135,300,000 | $ 135,300,000
Accumulated Amortization | 88,109,000 | 73,336,000
Total estimated amortization expense | 47,191,000 | 61,964,000
Other Amortizable Intangibles |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Value | 15,240,000 | 15,349,000
Accumulated Amortization | 5,246,000 | 3,644,000
Total estimated amortization expense | $ 9,994,000 | $ 11,705,000

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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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