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REPURCHASE AGREEMENTS (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase Agreements $ 210,055 $ 237,984
September 30, 2020    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase Agreements [1],[2] 210,055 237,984
Obligations of states and political subdivisions | September 30, 2020    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase Agreements [1],[2] 1,403 1,361
Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | September 30, 2020    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase Agreements 128,839 117,654
Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | September 30, 2020    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase Agreements [1],[2] 79,813 118,969
Collateral Pledged [Member] | September 30, 2020    
Assets Sold under Agreements to Repurchase [Line Items]    
Certificates of Deposit, at Carrying Value $ 1,000 $ 1,000
[1] (1)    Presented within short-term borrowings on the consolidated statements of condition.
[2] (2)    All customer repurchase agreements mature continuously or overnight for the dates indicated.