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Derivatives and Hedging - Fair Value Hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) related to hedge, firm commitments no longer qualifying as a fair value hedge $ 0 $ 0 $ 0 $ 0  
Derivatives designated as hedging instrument | Fair value hedges | Interest rate swap          
Derivative Instruments, Gain (Loss) [Line Items]          
Fair value hedges, weighted average expected remaining term     2 years 11 months 15 days    
Long-term debt          
Derivative Instruments, Gain (Loss) [Line Items]          
Carrying amount of hedging liabilities 3,258,201   $ 3,258,201   $ 3,483,177
Cumulative amount of fair value hedging adjustment included in the carrying amount of hedged liabilities - Hedged items currently designated 132,676   132,676   25,092
Cumulative amount of fair value hedging adjustment included in the carrying amount of hedged liabilities - Hedged items no longer designated $ 1,280   $ 1,280   $ 1,883