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Note 3 - Available for Sale Debt Securities (Details Textual)
9 Months Ended
May 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 01, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale, Number of Positions Sold   86      
Proceeds from Sale of Debt Securities, Available-for-sale $ 91,000,000 $ 91,094,000 $ 0    
Debt Securities, Available-for-sale, Gain (Loss), Total   $ (295,000)      
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions   177     14
Collateral Pledged [Member]          
Debt Securities, Available-for-sale, Restricted   $ 698,000,000     $ 505,000,000
Kentucky Bancshares [Member]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities $ 396,000,000     $ 395,862,000  
Other Assets [Member]          
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total   $ 2,300,000     $ 1,600,000