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REPURCHASE AGREEMENTS AND OTHER BORROWINGS (Narrative) (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding repurchase obligations $ 2,866,738,000 $ 3,025,052,000
Fair Value of securities pledged, including accrued interest receivable 3,041,369,000 3,214,369,000
Restricted cash $ 16,998,000 $ 17,981,000
Net weighted average borrowing rate 2.70% 2.65%
Repurchase Agreement [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding repurchase obligations $ 2,866,738,000 $ 3,025,052,000
Fair Value of securities pledged, including accrued interest receivable 3,041,369,000 3,214,369,000
Restricted cash $ 6,775,000 $ 7,034,000
Net weighted average borrowing rate 2.70% 2.65%
Aggregate amount at risk will all counterparties $ 176,300,000