| Summary of fair value of assets and liabilities measured at fair value on recurring basis |
| | | | | | | | | | | | | | | | | | Recurring Fair Value Measurements Using | | | | | | Quoted Prices | | | | | | | | | | | | in Active | | Significant | | | | | | Assets | | Markets for | | Other | | | Significant | | | Measured at | | Identical | | Observable | | | Unobservable | | | Fair Value | | Instruments | | Inputs | | | Inputs | | | March 31, 2026 | | (Level 1) | | (Level 2) | | | (Level 3) | Financial assets: | | | | | | | | | | | | | Securities available for sale: | | | | | | | | | | | | | Mortgage-backed securities | | $ | 6,942,905 | | $ | — | | $ | 6,942,905 | | $ | — | State and political subdivisions | | | 12,008,476 | | | — | | | 12,008,476 | | | — | Corporate securities | | | 3,031,330 | | | — | | | 3,031,330 | | | — | Total securities available for sale | | $ | 21,982,711 | | $ | — | | $ | 21,982,711 | | $ | — | | | | | | | | | | | | | | Fair value hedge on fixed rate loans | | $ | 23,547 | | $ | — | | $ | 23,547 | | $ | — |
| | | | | | | | | | | | | | | | | | Recurring Fair Value Measurements Using | | | | | | Quoted Prices | | | | | | | | | | | | in Active | | Significant | | | | | | Assets | | Markets for | | Other | | | Significant | | | Measured at | | Identical | | Observable | | | Unobservable | | | Fair Value | | Instruments | | Inputs | | | Inputs | | | December 31, 2025 | | (Level 1) | | (Level 2) | | | (Level 3) | Financial assets: | | | | | | | | | | | | | Securities available for sale: | | | | | | | | | | | | | Mortgage-backed securities | | $ | 7,187,725 | | $ | — | | $ | 7,187,725 | | $ | — | State and political subdivisions | | | 12,054,019 | | | — | | | 12,054,019 | | | — | Corporate securities | | | 3,047,665 | | | — | | | 3,047,665 | | | — | Total securities available for sale | | $ | 22,289,409 | | $ | — | | $ | 22,289,409 | | $ | — | | | | | | | | | | | | | | Financial liabilities: | | | | | | | | | | | | | Fair value hedge on fixed rate loans | | $ | 142,064 | | $ | — | | $ | 142,064 | | $ | — |
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