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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting of Financial Assets and Derivative Assets (Details) - Interest rate swaps - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Offsetting of Financial Assets and Derivative Assets |  |
Gross amounts of recognized assets | $ 18,577 | $ 11,269
Gross amounts offset in the Statements of Condition | (2,286) | (1,622)
Net amounts of assets presented in the Statements of Condition | 16,291 | 9,647
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 | 16,291 | 9,647
Institutional counterparties |  |
Offsetting of Financial Assets and Derivative Assets |  |
Gross amounts of recognized assets | 14,510 | 2,692
Gross amounts offset in the Statements of Condition | (2,286) | (1,622)
Net amounts of assets presented in the Statements of Condition | 12,224 | 1,070
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 | 12,224 | 1,070
Commercial counterparties |  |
Offsetting of Financial Assets and Derivative Assets |  |
Gross amounts of recognized assets | 4,067 | 8,577
Gross amounts offset in the Statements of Condition | 0 | 0
Net amounts of assets presented in the Statements of Condition | 4,067 | 8,577
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 | $ 4,067 | $ 8,577

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