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Note 3 - Bank Acquisitions (Details Textual) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 07, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Business Combination, Consideration Transferred, Total |  |  | $ 0 | $ 167,913,000 | $ 232,946,000 |
Debt Securities, Held-to-Maturity, Fair Value, Total |  | $ 431,833,000 | 408,519,000 | 431,833,000 |  |
Goodwill |  | 194,074,000 | 194,074,000 | 194,074,000 | 135,830,000 | $ 12,513,000
Gain (Loss) on Disposition of Business |  |  | (0) | (870,000) | (0) |
Goodwill, Written off Related to Sale of Business Unit |  |  | (0) | 8,450,000 | (0) |
Business Combination, Acquisition Related Costs |  |  | 0 | 19,500,000 | 19,025,000 |
Commonwealth [Member] |  |  |  |  |  |
Gain (Loss) on Disposition of Business |  | 870,000 |  |  |  |
Commonwealth [Member] |  |  |  |  |  |
Business Combination, Consideration Transferred, Total | $ 167,913,000 |  |  |  |  |
Number of Branches | 15 |  |  |  |  |
Debt Securities, Held-to-Maturity, Fair Value, Total | $ 162,000,000 |  |  |  |  |
Goodwill | 67,000,000 | 58,244,000 | $ 58,244,000 | 58,244,000 |  |
Business Acquisition, Transaction Costs | 19,500,000 |  |  |  |  |
Goodwill, Written off Related to Sale of Business Unit |  | $ 8,500,000 |  |  |  |
Business Combination, Acquired Receivable, Fair Value | 540,000,000 |  |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount | $ 549,000,000 |  |  |  |  |
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual |  |  |  | 38,600,000 |  |
Commonwealth [Member] | Merger Related Credit Loss [Member] |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  | 4,400,000 | 7,400,000 |
Commonwealth [Member] | Pre-tax Merger Expenses [Member] |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  |  | $ 24,100,000 | $ 18,500,000 |
Commonwealth [Member] | Jefferson County in Kentucky [Member] |  |  |  |  |  |
Number of Branches | 9 |  |  |  |  |
Commonwealth [Member] | Shelby County in Kentucky [Member] |  |  |  |  |  |
Number of Branches | 4 |  |  |  |  |
Commonwealth [Member] | Northern Kentucky [Member] |  |  |  |  |  |
Number of Branches | 2 |  |  |  |  |

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