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Derivative and Hedging Activities - Fair Value of Derivatives (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Derivatives Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Asset Derivatives $ 107,749 $ 38,877
Liability Derivatives 109,148 39,356
Derivatives Not Designated as Hedging Instrument | Other Assets | Interest Rate Products    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 107,652 38,830
Derivatives Not Designated as Hedging Instrument | Other Assets | Credit Risk Contract    
Derivatives, Fair Value [Line Items]    
Asset Derivatives 97 47
Derivatives Not Designated as Hedging Instrument | Other Liabilities | Interest Rate Products    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 109,148 39,356
Derivatives Not Designated as Hedging Instrument | Other Liabilities | Credit Risk Contract    
Derivatives, Fair Value [Line Items]    
Liability Derivatives 0 0
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Asset Derivatives (6,671) 428
Liability Derivatives 0 0
Designated as Hedging Instrument | Other Assets | Interest Rate Products    
Derivatives, Fair Value [Line Items]    
Asset Derivatives (6,671) 428
Designated as Hedging Instrument | Other Liabilities | Interest Rate Products    
Derivatives, Fair Value [Line Items]    
Liability Derivatives $ 0 $ 0