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Derivative Instruments (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Collateral already posted, aggregate fair value $ 28,100  
Interest Income    
Derivatives, Fair Value [Line Items]    
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments 200  
Available-for-sale Securities    
Derivatives, Fair Value [Line Items]    
Fair Value $ 3,500  
Interest Rate Swap | Non-hedging interest rate derivatives:    
Derivatives, Fair Value [Line Items]    
Derivative, notional amount   $ 150,000