| Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] |
| (in thousands, Except Share and Per Share Data) | | As Initially Reported | | | Measurement Period Adjustments | | | As Adjusted | |
| Purchase Price Consideration | | | | | | | | | | | | | | | | | | | | | | | | |
| Mifflinburg Bancorp, Inc. shares to be issued | | | 1,546,725 | | | | | | | | | | | | | | | | 1,546,725 | | | | | |
| Per share value assigned to shares issued | | $ | 26.00 | | | | | | | | | | | | | | | $ | 26.00 | | | | | |
| Total purchase price assigned to shares issued | | | | | | $ | 40,215 | | | | | | | | | | | | | | | $ | 40,215 | |
| Cash in lieu of fractional shares | | | | | | | 3 | | | | | | | | | | | | | | | | 3 | |
| Dissenter's shares (1) | | | 6,493 | | | | | | | | 6,493 | | | | | | | | 6,493 | | | | | |
| Fair value of Dissenter's shares | | $ | 28.80 | | | | | | | $ | 6.47 | | | | | | | $ | 35.27 | | | | | |
| Total fair value of Dissenter's shares | | | | | | | 187 | | | | | | | | 42 | | | | | | | | 229 | |
| Fair value of total consideration transferred | | | | | | $ | 40,405 | | | | | | | $ | 42 | | | | | | | $ | 40,447 | |
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| Recognized amounts of identifiable assets acquired and liabilities assumed, at fair value | | | | | | | | | | | | | | | | | | | | | | | | |
| Cash and cash equivalents | | $ | 43,589 | | | | | | | $ | - | | | | | | | $ | 43,589 | | | | | |
| Securities, available for sale | | | 165,660 | | | | | | | | - | | | | | | | | 165,660 | | | | | |
| Loans held for sale | | | 61 | | | | | | | | - | | | | | | | | 61 | | | | | |
| Loans gross | | | 427,066 | | | | | | | | 104 | | | | | | | | 427,170 | | | | | |
| Allowance for credit losses | | | (725 | ) | | | | | | | - | | | | | | | | (725 | ) | | | | |
| Loans, net of allowance | | | 426,341 | | | | | | | | 104 | | | | | | | | 426,445 | | | | | |
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| Bank owned life insurance | | | 14,848 | | | | | | | | - | | | | | | | | 14,848 | | | | | |
| Premises | | | 9,226 | | | | | | | | - | | | | | | | | 9,226 | | | | | |
| Furniture, fixtures and equipment | | | 515 | | | | | | | | - | | | | | | | | 515 | | | | | |
| Accrued interest receivable | | | 2,261 | | | | | | | | - | | | | | | | | 2,261 | | | | | |
| Restricted investment in bank stock | | | 2,948 | | | | | | | | - | | | | | | | | 2,948 | | | | | |
| Deferred tax asset | | | 2,849 | | | | | | | | 38 | | | | | | | | 2,887 | | | | | |
| Core deposit intangible | | | 14,662 | | | | | | | | - | | | | | | | | 14,662 | | | | | |
| Customer list intangibles | | | 1,406 | | | | | | | | - | | | | | | | | 1,406 | | | | | |
| Operating lease right of use asset | | | 132 | | | | | | | | - | | | | | | | | 132 | | | | | |
| Other assets | | | 3,679 | | | | | | | | (398 | ) | | | | | | | 3,281 | | | | | |
| Total identifiable assets acquired at fair value | | $ | 688,177 | | | | | | | $ | (256 | ) | | | | | | $ | 687,921 | | | | | |
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| Deposits | | $ | 597,060 | | | | | | | $ | - | | | | | | | $ | 597,060 | | | | | |
| Borrowings | | | 20,117 | | | | | | | | - | | | | | | | | 20,117 | | | | | |
| Subordinated debt | | | 9,753 | | | | | | | | - | | | | | | | | 9,753 | | | | | |
| Accrued interest payable | | | 554 | | | | | | | | - | | | | | | | | 554 | | | | | |
| Operating lease liability | | | 132 | | | | | | | | - | | | | | | | | 132 | | | | | |
| Reserve for unfunded commitments | | | 652 | | | | | | | | (652 | ) | | | | | | | - | | | | | |
| Other liabilities | | | 1,677 | | | | | | | | (122 | ) | | | | | | | 1,555 | | | | | |
| Total liabilities assumed | | $ | 629,945 | | | | | | | $ | (774 | ) | | | | | | $ | 629,171 | | | | | |
| Total identifiable net assets, at fair value | | | | | | $ | 58,232 | | | | | | | $ | 518 | | | | | | | $ | 58,750 | |
| Preliminary bargain purchase gain | | | | | | $ | 17,827 | | | | | | | $ | 476 | | | | | | | $ | 18,303 | |
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| Debt Securities, Available-for-Sale [Table Text Block] |
| August 1, 2025 | | | | | | | | |
| (Dollars in Thousands) | | PCD Loans | | | Non-PCD Loans | |
| Number of loans | | | 379 | | | | 4,101 | |
| NUBC recorded value | | $ | 53,676 | | | $ | 392,745 | |
| Discount for credit risk | | | (194 | ) | | | (4,474 | ) |
| Discount for non-credit factors | | | (1,238 | ) | | | (13,396 | ) |
| Fair value - initially reported | | $ | 52,244 | | | $ | 374,875 | |
| Measurement period adjustments | | $ | 1 | | | $ | 103 | |
| Fair value - adjusted | | $ | 52,245 | | | $ | 374,978 | |
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