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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Offsetting of Financial Assets and Derivative Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Offsetting Assets [Line Items]    
Net Amounts of Assets Presented in the Statements of Condition $ 80,190 $ 35,654
Interest Rate Swap    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 77,068 30,830
Gross Amounts Offset in the Statements of Condition (76) (3,749)
Net Amounts of Assets Presented in the Statements of Condition 76,992 27,081
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 76,992 27,081
Interest Rate Swap | Institutional counterparties    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 640 9,485
Gross Amounts Offset in the Statements of Condition (54) (3,592)
Net Amounts of Assets Presented in the Statements of Condition 586 5,893
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 586 5,893
Interest Rate Swap | Commercial counterparties    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 76,428 21,345
Gross Amounts Offset in the Statements of Condition (22) (157)
Net Amounts of Assets Presented in the Statements of Condition 76,406 21,188
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 $ 76,406 $ 21,188