DERIVATIVES AND HEDGING (Derivative Offsetting) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Offsetting Derivative Assets [Abstract]
Derivative Assets, Gross Amounts Recognized	$ 42,687	$ 15,242
Derivative Assets, Amounts offsett in the Statement of Financial Condition	0	(40)
Derivative Assets, Net Amounts in the Statement of Financial Condition	42,687	15,202
Derivative Assets, Netting Adjustment Per Applicable Master Netting Agreements	0	0
Derivative Assets, Fair Value of Financial Collateral in the Statement of Financial Condiation	0	0
Derivative Assets, Net Amount	42,687	15,202
Offsetting Derivative Liabilities [Abstract]
Derivative Liabilities, Gross Amounts Recognized	42,687	15,242
Derivative Liabilities, Amounts offset in the Statement of Financial Condition	(19,407)	(4,276)
Derivative Liabilities, Net Amounts of the Statement of Financial Condition	23,280	10,966
Derivative Liabilities, Net Adjustment Per Applicable Master Netting Agreements	0	0
Derivative Liabilities, Fair Value of Financial Collateral in the Statement of Financial Condition	(23,285)	(15,209)
Derivative Liabilities, Net Amount	(5)	(4,243)
Interest rate swaps [Member]
Offsetting Assets and Liabilities [Line Items]
Derivatives, variation margin adjustment	19,400	4,300
Offsetting Derivative Assets [Abstract]
Derivative Assets, Gross Amounts Recognized	42,687	15,242
Derivative Assets, Amounts offsett in the Statement of Financial Condition	0	(40)
Derivative Assets, Net Amounts in the Statement of Financial Condition	42,687	15,202
Derivative Assets, Netting Adjustment Per Applicable Master Netting Agreements	0	0
Derivative Assets, Fair Value of Financial Collateral in the Statement of Financial Condiation	0	0
Derivative Assets, Net Amount	42,687	15,202
Offsetting Derivative Liabilities [Abstract]
Derivative Liabilities, Gross Amounts Recognized	42,687	15,242
Derivative Liabilities, Amounts offset in the Statement of Financial Condition	(19,407)	(4,276)
Derivative Liabilities, Net Amounts of the Statement of Financial Condition	23,280	10,966
Derivative Liabilities, Net Adjustment Per Applicable Master Netting Agreements	0	0
Derivative Liabilities, Fair Value of Financial Collateral in the Statement of Financial Condition	(23,285)	(15,209)
Derivative Liabilities, Net Amount	$ (5)	$ (4,243)