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Derivatives Financial Instruments - Interest Rate Swaps related to Loan Hedging Program (Details) - Interest Rate Swap [Member] - Non-hedged derivatives [Member] - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]    
Notional Amount, Asset $ 750  
Estimated Fair Value, Asset 12
Notional Amount, Liability 750  
Estimated Fair Value, Liability (12)
Notional Amount 1,500  
Estimated Fair Value