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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting of Financial Assets and Derivative Assets (Details) - Interest rate swaps - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Offsetting of Financial Assets and Derivative Assets
Gross amounts of recognized assets	$ 76,426	$ 30,830
Gross amounts offset in the Statements of Condition	(47)	(3,749)
Net amounts of assets presented in the Statements of Condition	76,379	27,081
Gross amounts not offset in the Statements of Condition, financial instruments	0	0
Gross amounts not offset in the Statements of Condition, cash collateral received	0	0
Net amount	76,379	27,081
Institutional counterparties
Offsetting of Financial Assets and Derivative Assets
Gross amounts of recognized assets	543	9,485
Gross amounts offset in the Statements of Condition	(14)	(3,592)
Net amounts of assets presented in the Statements of Condition	529	5,893
Gross amounts not offset in the Statements of Condition, financial instruments	0	0
Gross amounts not offset in the Statements of Condition, cash collateral received	0	0
Net amount	529	5,893
Commercial counterparties
Offsetting of Financial Assets and Derivative Assets
Gross amounts of recognized assets	75,883	21,345
Gross amounts offset in the Statements of Condition	(33)	(157)
Net amounts of assets presented in the Statements of Condition	75,850	21,188
Gross amounts not offset in the Statements of Condition, financial instruments	0	0
Gross amounts not offset in the Statements of Condition, cash collateral received	0	0
Net amount	$ 75,850	$ 21,188

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