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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares
Pay vs Performance Disclosure |  |  |  |
Pay vs Performance Disclosure, Table | Pay Versus Performance As required by Section 953(b) of the Dodd-Frank Act and 402(v) of Regulation S-K, we are providing the following information about the relationship between executive compensation actually paid and certain financial performance measures of Bank First Corporation.
​ | ​ | Year | ​ | ​ | ​ | Summary Compensation Table for PEO (1) | ​ | ​ | ​ | Compensation Actually Paid to PEO | ​ | ​ | ​ | Avg. Summary Compensation Table Total for Non-PEO NEOs (2) | ​ | ​ | ​ | Avg. Compensation Actually Paid to Non-PEO NEOs | ​ | ​ | ​ | Total Shareholder Return (3) | ​ | ​ | ​ | Peer Group Total Shareholder Return (3) | ​ | ​ | ​ | Net Income (4) | ​ | ​ | ​ | Earnings Per Share | ​ | ​
​ | ​ | 2024 | ​ | ​ | ​ | ​ | $ | 1,699,536 | ​ | ​ | ​ | ​ | ​ | $ | 1,764,518 | ​ | ​ | ​ | ​ | ​ | $ | 761,998 | ​ | ​ | ​ | ​ | ​ | $ | 788,074 | ​ | ​ | ​ | ​ | ​ | $ | 152.04 | ​ | ​ | ​ | ​ | ​ | $ | 133.60 | ​ | ​ | ​ | ​ | ​ | $ | 65,600,000 | ​ | ​ | ​ | ​ | ​ | $ | 6.50 | ​ | ​ | ​
​ | ​ | 2023 | ​ | ​ | ​ | ​ | $ | 1,434,645 | ​ | ​ | ​ | ​ | ​ | $ | 1,516,712 | ​ | ​ | ​ | ​ | ​ | $ | 587,255 | ​ | ​ | ​ | ​ | ​ | $ | 596,123 | ​ | ​ | ​ | ​ | ​ | $ | 130.76 | ​ | ​ | ​ | ​ | ​ | $ | 121.49 | ​ | ​ | ​ | ​ | ​ | $ | 74,514,000 | ​ | ​ | ​ | ​ | ​ | $ | 7.28 | ​ | ​ | ​
​ | ​ | 2022 | ​ | ​ | ​ | ​ | $ | 1,331,475 | ​ | ​ | ​ | ​ | ​ | $ | 1,593,638 | ​ | ​ | ​ | ​ | ​ | $ | 582,260 | ​ | ​ | ​ | ​ | ​ | $ | 701,761 | ​ | ​ | ​ | ​ | ​ | $ | 138.13 | ​ | ​ | ​ | ​ | ​ | $ | 105.56 | ​ | ​ | ​ | ​ | ​ | $ | 45,214,000 | ​ | ​ | ​ | ​ | ​ | $ | 5.58 | ​ | ​ | ​
​ | ​ | 2021 | ​ | ​ | ​ | ​ | $ | 1,299,618 | ​ | ​ | ​ | ​ | ​ | $ | 1,392,441 | ​ | ​ | ​ | ​ | ​ | $ | 597,502 | ​ | ​ | ​ | ​ | ​ | $ | 622,248 | ​ | ​ | ​ | ​ | ​ | $ | 106.21 | ​ | ​ | ​ | ​ | ​ | $ | 134.57 | ​ | ​ | ​ | ​ | ​ | $ | 45,444,000 | ​ | ​ | ​ | ​ | ​ | $ | 5.92 | ​ | ​ | ​
(1) Our Principal Executive Officer (“PEO”) for 2024, 2023, 2022, and 2021 was Michael B. Molepske. (2) In 2024, our non-PEO NEOs were Timothy J. McFarlane, Kevin M. LeMahieu, Jason V. Krepline and Kelly M. Dvorak. In 2023, our non-PEO NEOs were Timothy J. McFarlane, Kevin M. LeMahieu, Jason V. Krepline, and Joan A. Woldt. In 2022 and 2021, our non-PEO NEOs were Michael P. Dempsey, Kevin M. LeMahieu, Jason V. Krepline, and Joan A. Woldt. (3) Total shareholder return assumes a hypothetical investment of $100 in common stock on January 1, 2019, with dividends reinvested, and compares the performance of Bank First Corporation common stock to the cumulative total return of the Russell 2000 Index. (4) Net income of the Company as reported in the Consolidated Statements of Income in Bank First Corporation’s Annual Report on Form 10-K filed with the SEC on February 28, 2025. Adjustments to Determine Compensation Actually Paid to PEO
​ | ​ | ​ | ​ | ​ | ​ | 2024 | ​ | ​ | ​ | 2023 | ​ | ​ | ​ | 2022 | ​ | ​ | ​ | 2021 | ​ | ​
​ | ​ | Deduct: Value of Stock Awards included in SCT | ​ | ​ | ​ | $(421,352) | ​ | ​ | ​ | $(350,664) | ​ | ​ | ​ | $(340,561) | ​ | ​ | ​ | $(332,254) | ​ | ​
​ | ​ | Add: Year End Fair Value of Outstanding & Unvested Equity Awards Granted in Year | ​ | ​ | ​ | $486,334 | ​ | ​ | ​ | $384,168 | ​ | ​ | ​ | $453,040 | ​ | ​ | ​ | $337,867 | ​ | ​
​ | ​ | Change in Year End Fair Value of Outstanding & Unvested Equity Awards Compared to Prior Year | ​ | ​ | ​ | $102,166 | ​ | ​ | ​ | $(68,872) | ​ | ​ | ​ | $115,173 | ​ | ​ | ​ | $63,631 | ​ | ​
​ | ​ | Add: Vesting Date Fair Value of Equity Awards Granted and Vested in Year | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​
​ | ​ | Change in Vesting Date Fair Value of Vested Equity Awards Compared to Prior Year | ​ | ​ | ​ | $94,268 | ​ | ​ | ​ | $117,435 | ​ | ​ | ​ | $34,511 | ​ | ​ | ​ | $23,579 | ​ | ​
​ | ​ | Deduct: Prior Year End Fair Value of Forfeited Equity Awards During the Year | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​
​ | ​ | Total Adjustments | ​ | ​ | ​ | $64,982 | ​ | ​ | ​ | $82,067 | ​ | ​ | ​ | $262,163 | ​ | ​ | ​ | $92,823 | ​ | ​
Adjustments to Determine Compensation Actually Paid to Non-PEO NEOs
​ | ​ | ​ | ​ | ​ | ​ | 2024 | ​ | ​ | ​ | 2023 | ​ | ​ | ​ | 2022 | ​ | ​ | ​ | 2021 | ​ | ​
​ | ​ | Deduct: Value of Stock Awards included in SCT | ​ | ​ | ​ | $(169,082) | ​ | ​ | ​ | $(138,694) | ​ | ​ | ​ | $(141,203) | ​ | ​ | ​ | $(116,098) | ​ | ​
​ | ​ | Add: Year End Fair Value of Outstanding & Unvested Equity Awards Granted in Year | ​ | ​ | ​ | $195,158 | ​ | ​ | ​ | $151,946 | ​ | ​ | ​ | $187,839 | ​ | ​ | ​ | $118,040 | ​ | ​
​ | ​ | Change in Year End Fair Value of Outstanding & Unvested Equity Awards Compared to Prior Year | ​ | ​ | ​ | $43,212 | ​ | ​ | ​ | $(35,893) | ​ | ​ | ​ | $69,799 | ​ | ​ | ​ | $13,058 | ​ | ​
​ | ​ | Add: Vesting Date Fair Value of Equity Awards Granted and Vested in Year | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​
​ | ​ | Change in Vesting Date Fair Value of Vested Equity Awards Compared to Prior Year | ​ | ​ | ​ | $25,213 | ​ | ​ | ​ | $31,509 | ​ | ​ | ​ | $3,066 | ​ | ​ | ​ | $9,746 | ​ | ​
​ | ​ | Deduct: Prior Year End Fair Value of Forfeited Equity Awards During the Year | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​
​ | ​ | Total Adjustments | ​ | ​ | ​ | $26,076 | ​ | ​ | ​ | $8,868 | ​ | ​ | ​ | $119,501 | ​ | ​ | ​ | $24,746 | ​ | ​
Company Selected Measure Name | Earnings Per Share |  |  |
Named Executive Officers, Footnote | (1) Our Principal Executive Officer (“PEO”) for 2024, 2023, 2022, and 2021 was Michael B. Molepske. (2) In 2024, our non-PEO NEOs were Timothy J. McFarlane, Kevin M. LeMahieu, Jason V. Krepline and Kelly M. Dvorak. In 2023, our non-PEO NEOs were Timothy J. McFarlane, Kevin M. LeMahieu, Jason V. Krepline, and Joan A. Woldt. In 2022 and 2021, our non-PEO NEOs were Michael P. Dempsey, Kevin M. LeMahieu, Jason V. Krepline, and Joan A. Woldt. |  |  |
Peer Group Issuers, Footnote | (3) Total shareholder return assumes a hypothetical investment of $100 in common stock on January 1, 2019, with dividends reinvested, and compares the performance of Bank First Corporation common stock to the cumulative total return of the Russell 2000 Index. |  |  |
PEO Total Compensation Amount | $ 1,699,536 | $ 1,434,645 | $ 1,331,475 | $ 1,299,618
PEO Actually Paid Compensation Amount | $ 1,764,518 | 1,516,712 | 1,593,638 | 1,392,441
Adjustment To PEO Compensation, Footnote | Adjustments to Determine Compensation Actually Paid to PEO
​ | ​ | ​ | ​ | ​ | ​ | 2024 | ​ | ​ | ​ | 2023 | ​ | ​ | ​ | 2022 | ​ | ​ | ​ | 2021 | ​ | ​
​ | ​ | Deduct: Value of Stock Awards included in SCT | ​ | ​ | ​ | $(421,352) | ​ | ​ | ​ | $(350,664) | ​ | ​ | ​ | $(340,561) | ​ | ​ | ​ | $(332,254) | ​ | ​
​ | ​ | Add: Year End Fair Value of Outstanding & Unvested Equity Awards Granted in Year | ​ | ​ | ​ | $486,334 | ​ | ​ | ​ | $384,168 | ​ | ​ | ​ | $453,040 | ​ | ​ | ​ | $337,867 | ​ | ​
​ | ​ | Change in Year End Fair Value of Outstanding & Unvested Equity Awards Compared to Prior Year | ​ | ​ | ​ | $102,166 | ​ | ​ | ​ | $(68,872) | ​ | ​ | ​ | $115,173 | ​ | ​ | ​ | $63,631 | ​ | ​
​ | ​ | Add: Vesting Date Fair Value of Equity Awards Granted and Vested in Year | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​
​ | ​ | Change in Vesting Date Fair Value of Vested Equity Awards Compared to Prior Year | ​ | ​ | ​ | $94,268 | ​ | ​ | ​ | $117,435 | ​ | ​ | ​ | $34,511 | ​ | ​ | ​ | $23,579 | ​ | ​
​ | ​ | Deduct: Prior Year End Fair Value of Forfeited Equity Awards During the Year | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​
​ | ​ | Total Adjustments | ​ | ​ | ​ | $64,982 | ​ | ​ | ​ | $82,067 | ​ | ​ | ​ | $262,163 | ​ | ​ | ​ | $92,823 | ​ | ​
Non-PEO NEO Average Total Compensation Amount | $ 761,998 | 587,255 | 582,260 | 597,502
Non-PEO NEO Average Compensation Actually Paid Amount | $ 788,074 | 596,123 | 701,761 | 622,248
Adjustment to Non-PEO NEO Compensation Footnote | Adjustments to Determine Compensation Actually Paid to Non-PEO NEOs
​ | ​ | ​ | ​ | ​ | ​ | 2024 | ​ | ​ | ​ | 2023 | ​ | ​ | ​ | 2022 | ​ | ​ | ​ | 2021 | ​ | ​
​ | ​ | Deduct: Value of Stock Awards included in SCT | ​ | ​ | ​ | $(169,082) | ​ | ​ | ​ | $(138,694) | ​ | ​ | ​ | $(141,203) | ​ | ​ | ​ | $(116,098) | ​ | ​
​ | ​ | Add: Year End Fair Value of Outstanding & Unvested Equity Awards Granted in Year | ​ | ​ | ​ | $195,158 | ​ | ​ | ​ | $151,946 | ​ | ​ | ​ | $187,839 | ​ | ​ | ​ | $118,040 | ​ | ​
​ | ​ | Change in Year End Fair Value of Outstanding & Unvested Equity Awards Compared to Prior Year | ​ | ​ | ​ | $43,212 | ​ | ​ | ​ | $(35,893) | ​ | ​ | ​ | $69,799 | ​ | ​ | ​ | $13,058 | ​ | ​
​ | ​ | Add: Vesting Date Fair Value of Equity Awards Granted and Vested in Year | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​ | ​ | $0 | ​ | ​
​ | ​ | Change in Vesting Date Fair Value of Vested Equity Awards Compared to Prior Year | ​ | ​ | ​ | $25,213 | ​ | ​ | ​ | $31,509 | ​ | ​ | ​ | $3,066 | ​ | ​ | ​ | $9,746 | ​ | ​
​ | ​ | Deduct: Prior Year End Fair Value of Forfeited Equity Awards During the Year | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​ | ​ | — | ​ | ​
​ | ​ | Total Adjustments | ​ | ​ | ​ | $26,076 | ​ | ​ | ​ | $8,868 | ​ | ​ | ​ | $119,501 | ​ | ​ | ​ | $24,746 | ​ | ​
Compensation Actually Paid vs. Total Shareholder Return |  |  |  |
Compensation Actually Paid vs. Net Income |  |  |  |
Compensation Actually Paid vs. Company Selected Measure |  |  |  |
Total Shareholder Return Vs Peer Group |  |  |  |
Tabular List, Table | Tabular List of Financial Performance Measures Pursuant to the requirements of Item 402(v), we provide the following list of the three most important financial performance measures used to link Compensation Actually Paid (“CAP”) (as calculated in accordance with SEC rules), to our NEOs in 2024. • Measure 1 — Earnings per share ​ • Measure 2 — Net income ​ • Measure 3 — Nonperforming assets to total assets |  |  |
Total Shareholder Return Amount | $ 152.04 | 130.76 | 138.13 | 106.21
Peer Group Total Shareholder Return Amount | 133.6 | 121.49 | 105.56 | 134.57
Net Income (Loss) | $ 65,600,000 | $ 74,514,000 | $ 45,214,000 | $ 45,444,000
Company Selected Measure Amount | $ / shares | 6.5 | 7.28 | 5.58 | 5.92
PEO Name | Michael B. Molepske |  |  |
Measure:: 1 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Earnings per share |  |  |
Measure:: 2 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Net income |  |  |
Measure:: 3 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Nonperforming assets to total assets |  |  |
PEO | Equity Awards Adjustments |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ 64,982 | $ 82,067 | $ 262,163 | $ 92,823
PEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (421,352) | (350,664) | (340,561) | (332,254)
PEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 486,334 | 384,168 | 453,040 | 337,867
PEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 102,166 | (68,872) | 115,173 | 63,631
PEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0
PEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 94,268 | 117,435 | 34,511 | 23,579
PEO | Equity Awards Adjustments Prior Year End Fair Value of Forfeited Equity Awards During the year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount |  |  |  |
Non-PEO NEO | Equity Awards Adjustments |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 26,076 | 8,868 | 119,501 | 24,746
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (169,082) | (138,694) | (141,203) | (116,098)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 195,158 | 151,946 | 187,839 | 118,040
Non-PEO NEO | Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 43,212 | (35,893) | 69,799 | 13,058
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 0 | 0 | 0 | 0
Non-PEO NEO | Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 25,213 | 31,509 | 3,066 | 9,746
Equity Awards Adjustments Prior Year End Fair Value of Forfeited Equity Awards During the year [Member] |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount |  |  |  |

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