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Derivatives Financial Instruments - Fair Value Hedges on Balance Sheet (Details) - Interest Rate Swap Liability [Member] - Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Weighted Average Remaining Maturity (In Years) 5 years 8 months 26 days 7 years 1 month 17 days
Weighted Average Pay Rate 3.09% 3.08%
Notional Amount $ 36,000 $ 36,000
Estimated Fair Value $ (4,180) $ (6,174)