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Derivatives and Hedging Activities Derivative and Hedging Activities - Amount of loss reclassified from AOCI into Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Document Fiscal Year Focus     2018  
Borrowings [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]        
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion $ 1,050   $ 839  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion   $ 2,001   $ 7,463