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Note 4 - Derivatives - Summary of Fair Value Hedge Relationships (Details) - Interest Rate Swap [Member] - Fair Value Hedging [Member] - Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Weighted Average Remaining Maturity (Year) 9 years 2 months 1 day 9 years 5 months 1 day
Notional Amount $ 28,114  
Notional Amount   $ 29,575
Other Assets [Member]    
Estimated Fair Value $ 1,461  
Other Liabilities [Member]    
Interest rate swap agreements - loans   $ (51)
London Interbank Offered Rate (LIBOR) Swap Rate [Member]    
Weighted Average Pay Rate 0.65% 0.65%