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Derivative Financial Instruments - Fair Value Hedges (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
derivative
Dec. 31, 2020
USD ($)
derivative
Fair value hedges    
Fair hedges carried    
Fixed interest rate (as a percent) 2.90% 2.90%
Derivatives designated as hedging instruments | Interest rate swaps    
Fair hedges carried    
Notional amounts $ 22,066 $ 22,451
Derivatives designated as hedging instruments | Interest rate swaps | Fair value hedges    
Fair hedges carried    
Number of derivatives carried | derivative 1 1
Notional amounts $ 22,100 $ 22,500
Negative fair value $ 900 $ 1,300