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REPURCHASE AGREEMENTS AND OTHER BORROWINGS (Narrative) (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding repurchase obligations $ 3,329,527,000 $ 3,025,052,000
Fair Value of securities pledged, including accrued interest receivable 3,518,536,000 3,214,369,000
Restricted cash $ 45,532,000 $ 17,981,000
Net weighted average borrowing rate 2.63% 2.65%
Repurchase Agreement [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding repurchase obligations $ 3,329,527,000 $ 3,025,052,000
Fair Value of securities pledged, including accrued interest receivable 3,518,536,000 3,214,369,000
Restricted cash $ 32,669,000 $ 7,034,000
Net weighted average borrowing rate 2.63% 2.65%
Aggregate amount at risk will all counterparties $ 212,000,000