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v3.26.1

Note 25 - Subsequent Event (Details Textual) $ in Thousands | May 01, 2026 USD ($) | Mar. 31, 2026 USD ($) | Dec. 31, 2025 USD ($) | Mar. 31, 2025 USD ($)
--- | --- | --- | --- | ---
Assets |  | $ 9,466,856 | $ 9,536,124 | $ 8,997,478
Deposits |  | 7,757,236 | 7,791,137 |
Investment Management and Trust [Member] |  |  |  |
Assets |  | 32,968 |  | $ 33,713
Assets under Management, Carrying Amount |  | 7,600,000 | $ 7,640,000 |
Field & Main Bancorp, Inc. [Member] |  |  |  |
Assets |  | 860,000 |  |
Financing Receivable, before Allowance for Credit Loss |  | 640,000 |  |
Deposits |  | 780,000 |  |
Field & Main Bancorp, Inc. [Member] | Investment Management and Trust [Member] |  |  |  |
Assets under Management, Carrying Amount |  | $ 791,000 |  |
Subsequent Event [Member] |  |  |  |
Number of Branches | 81 |  |  |
Subsequent Event [Member] | Field & Main Bancorp, Inc. [Member] |  |  |  |
Number of Branches | 6 |  |  |
Subsequent Event [Member] | Field & Main Bancorp, Inc. [Member] |  |  |  |
Business Combination, Consideration Transferred | $ 112,000 |  |  |
Business Combination, Recognized Asset Acquired, Asset | 10,300,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans, Gross | 7,900,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 8,500,000 |  |  |
Business Combination, Recognized Asset Acquired, Assets Under Management | $ 8,400,000 |  |  |

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