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Derivatives and Hedging Activities - Agreements with Derivative Counterparties (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Loan Level Swap    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Counterparties Collateral $ 5,300,000  
Net Liability Position | Balance Sheet Hedge    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Counterparties Collateral $ 391,000  
Net Liability Position | Loan Level Swap | Commercial Lending Customer    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative Counterparties Collateral   $ 1,100,000