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BORROWINGS BORROWINGS - Repurchase Agreements (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Securities Sold under Agreements to Repurchase   $ 90,181  
Carrying Value of Securities Sold under Repurchase Agreements and Deposits Received for Securities Loaned $ 90,200   $ 85,500
Collateralized Mortgage Obligations      
Securities Sold under Agreements to Repurchase   80,426  
Mortgage-backed securities      
Securities Sold under Agreements to Repurchase   $ 9,755