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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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