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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting of Financial Liabilities and Derivative Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Offsetting Liabilities [Line Items]    
Net Amounts of Liabilities Presented in the Statement of Condition $ (24,420) $ (28,181)
Gross amounts not offset in the Statements of Condition, cash collateral pledged 900 16,100
Interest Rate Swap    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (24,484) (28,220)
Gross Amounts Offset in the Statements of Condition 4,712 0
Net Amounts of Liabilities Presented in the Statement of Condition (19,772) (28,220)
Gross amounts not offset in the Statements of Condition, financial instruments 14,738 18,500
Gross amounts not offset in the Statements of Condition, cash collateral pledged 650 9,720
Net Amount (4,384) 0
Interest Rate Swap | Institutional counterparties    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (20,077) (28,220)
Gross Amounts Offset in the Statements of Condition 4,689 0
Net Amounts of Liabilities Presented in the Statement of Condition (15,388) (28,220)
Gross amounts not offset in the Statements of Condition, financial instruments 14,738 18,500
Gross amounts not offset in the Statements of Condition, cash collateral pledged 650 9,720
Net Amount 0 0
Interest Rate Swap | Commercial counterparties    
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (4,407) 0
Gross Amounts Offset in the Statements of Condition 23 0
Net Amounts of Liabilities Presented in the Statement of Condition (4,384) 0
Gross amounts not offset in the Statements of Condition, financial instruments 0 0
Gross amounts not offset in the Statements of Condition, cash collateral pledged 0 0
Net Amount $ (4,384) $ 0