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Note 5 - Loans and ACL for Loans (Details Textual)		12 Months Ended
		Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2022 USD ($)	Mar. 07, 2022 USD ($)	May 31, 2021 USD ($)
Loans and Leases Receivable, Deferred Expense (Income)		$ 1,000,000	$ 6,000,000
Continuing Involvement with Transferred Financial Assets, Principal Amount Outstanding		5,000,000	5,000,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss		17,000,000	11,000,000
Financing Receivable, before Allowance for Credit Loss, Total	[1]	5,205,918,000	4,169,303,000
Financing Receivable, after Allowance for Credit Loss, Total		5,132,387,000	4,115,405,000
Financing Receivable, Purchased with Credit Deterioration, Interest Income		5,200,000	647,000
Financing Receivable, Nonaccrual, Interest Income		$ 0	$ 0
Financing Receivable, Modifications, Number of Contracts		0	2
Financing Receivable, Troubled Debt Restructuring		$ 850,000	$ 962,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts		0
Mortgage Loans in Process of Foreclosure, Amount		$ 317,000	917,000
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, before Allowance for Credit Loss, Total		$ 2,231,975,000	$ 1,806,649,000
Financing Receivable, Modifications, Number of Contracts		1	1
Financing Receivable, Troubled Debt Restructuring		$ 850,000	$ 950,000
Financing Receivable, Troubled Debt Restructuring, Premodification			2,000,000
Financing Receivable, Troubled Debt Restructuring, Postmodification			950,000
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total			548,000
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring			12,000
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member]
Financing Receivable, before Allowance for Credit Loss, Total		2,770,000,000	$ 2,200,000,000
Commonwealth [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross					$ 632,404,000
Kentucky Bancshares [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross						$ 755,175,000
Kentucky Bancshares [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, after Allowance for Credit Loss, Total		$ 64,000,000		$ 13,000,000
[1] Total loans are presented inclusive of premiums, discounts and net loan origination fees and costs.

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The amount of loans, before allowance, recognized as of the acquisition date.

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