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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting of Financial Assets and Derivative Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Offsetting Assets [Line Items] |  |
Net Amounts of Assets Presented in the Statements of Condition | $ 21,617 | $ 17,507
Interest Rate Swap |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | 11,510 | 17,169
Gross Amounts Offset in the Statements of Condition | 0 | 0
Net Amounts of Assets Presented in the Statements of Condition | 11,510 | 17,169
Gross amounts not offset in the Statement of Condition, financial instruments | 0 | 0
Gross amounts not offset in the Statement of Condition, cash collateral received | 0 | 0
Net Amount | 11,510 | 17,169
Interest Rate Swap | Institutional counterparties |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | 49 | 40
Gross Amounts Offset in the Statements of Condition | 0 | 0
Net Amounts of Assets Presented in the Statements of Condition | 49 | 40
Gross amounts not offset in the Statement of Condition, financial instruments | 0 | 0
Gross amounts not offset in the Statement of Condition, cash collateral received | 0 | 0
Net Amount | 49 | 40
Interest Rate Swap | Commercial counterparties |  |
Offsetting Assets [Line Items] |  |
Gross Amounts of Recognized Assets | 11,461 | 17,129
Gross Amounts Offset in the Statements of Condition | 0 | 0
Net Amounts of Assets Presented in the Statements of Condition | 11,461 | 17,129
Gross amounts not offset in the Statement of Condition, financial instruments | 0 | 0
Gross amounts not offset in the Statement of Condition, cash collateral received | 0 | 0
Net Amount | $ 11,461 | $ 17,129

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