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GOODWILL AND OTHER INTANGIBLE ASSETS (Schedule of Core Deposit, Customer Relationship and Other Intangibles) (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 69,722 $ 69,722
Accumulated Amortization 35,775 33,629
Net Carrying Value 33,947 36,093
Core deposit intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 51,402 51,402
Accumulated Amortization 25,410 23,772
Net Carrying Value 25,992 27,630
Customer relationship intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 17,753 17,753
Accumulated Amortization 9,869 9,385
Net Carrying Value 7,884 8,368
Other intangibles    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 567 567
Accumulated Amortization 496 472
Net Carrying Value $ 71 $ 95