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Note 4 - Investment Securities (Details Textual)		3 Months Ended		12 Months Ended
	May 31, 2021 USD ($)	Mar. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 07, 2022 USD ($)
Debt Securities, Held-to-Maturity, Number of Securities				0
Debt Securities, Held-to-Maturity, Allowance for Credit Loss, Ending Balance				$ 0	$ 0
Debt Securities, Held-to-Maturity, Nonaccrual				0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total				3,800,000	2,600,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss				1,800,000	0
Debt Securities, Available-for-sale, Number of Positions Sold		3	86
Proceeds from Sale of Debt Securities, Available-for-sale	$ 91,000,000	$ 2,000,000	$ 91,000,000	2,111,000	91,214,000	$ 0
Debt Securities, Available-for-Sale, Gain (Loss), Total		$ (92,000)	$ (295,000)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Ending Balance				$ 0	$ 0
Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions				547	227
Debt Securities, Available-for-Sale, Unrealized Loss Position, Percentage				98.00%	79.00%
Collateral Pledged [Member]
Debt Securities, Available-for-Sale, Restricted				$ 1,100,000,000	$ 879,000,000
Commonwealth [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities							$ 247,000,000
Kentucky Bancshares [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	$ 395,862,000
Other Assets [Member]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total				4,000,000	3,000,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss				$ 2,000,000	$ 0

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