Transactions with Related Parties and Parties-in-Interest (Details) - Bank First Retirement Plan - Common Stock - Bank First Corporation - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
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| Transactions with Related Parties and Parties-in-Interest | ||
| Purchase of stock, Number of shares | 30,216 | 21,143 |
| Purchase of stock, Value of shares on transaction dates | $ 3,427,875 | $ 1,851,511 |
| In-kind transfers of stock out of Plan, Number of shares | 11,862 | 17,104 |
| In-kind transfers of stock out of Plan, Value of shares on transaction dates | $ 1,272,293 | $ 1,415,067 |
| Sales of stock, Number of shares | 56,107 | 54,998 |
| Sales of stock, Value of shares on transaction dates | $ 6,643,602 | $ 4,776,633 |
| Number of shares held | 183,622 | 221,214 |
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- Definition Amount of selling price for investment, excluding plan interest in master trust, in-kind transfers of stock out of the plan by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). No definition available.
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- Definition Number of shares or units of investment in-kind transfer out of the plan by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). No definition available.
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- Definition Amount of purchase price for investment, excluding plan interest in master trust, acquired by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Number of shares or units of investment held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of shares or units of investment purchased by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Number of shares or units of investment sold by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Amount of selling price for investment, excluding plan interest in master trust, sold by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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