0001521951 2026-03-02 2026-03-02 0001521951 1 2026-03-02 2026-03-02 0001521951 2 2026-03-02 2026-03-02 0001521951 3 2026-03-02 2026-03-02 0001521951 4 2026-03-02 2026-03-02 0001521951 5 2026-03-02 2026-03-02 0001521951 6 2026-03-02 2026-03-02 0001521951 7 2026-03-02 2026-03-02 0001521951 1 2026-03-02 2026-03-02 0001521951 2 2026-03-02 2026-03-02 iso4217:USD pure S-3 S-3 EX-FILING FEES 0001521951 FIRST BUSINESS FINANCIAL SERVICES, INC. N/A true false S-3 FIRST BUSINESS FINANCIAL SERVICES, INC. false Equity Common Stock true 0.00 0.0001381 0.00 false Equity Preferred Stock true 0.00 0.0001381 0.00 false Debt Debt true 0.00 0.0001381 0.00 false Equity Warrants true 0.00 0.0001381 0.00 false Other Units true 0.00 0.0001381 0.00 false Equity Depository Shares true 0.00 0.0001381 0.00 false Other Unallocated (Universal Shelf) true 100000000.00 0.0001381 13810.00 100000000.00 13810.00 0.00 6952.50 6857.50 The proposed maximum offering price per security will be determined from time to time by the registrant in connection with the issuance of the securities registered by this registration statement. The proposed maximum aggregate offering price has been estimated solely for the purpose of calculating the registration fee. In no event will the aggregate maximum offering price of all securities issued under this registration statement exceed $100,000,000. The amount registered is not specified as to each class of securities to be registered hereunder pursuant to General Instruction II.D to Form S-3 under the Securities Act of 1933, as amended. true First Business Financial Services, Inc S-3 333-263296 2022-03-04 6952.50 Unallocated (Universal) Shelf Unallocated (Universal Shelf) 75000000.00 true First Business Financial Services, Inc S-3 333-263296 2022-03-04 6952.50 Pursuant to Rule 457(p) under the Securities Act, a registration fee of $6,952.50 was paid with respect to securities available for issuance under a Registration Statement on Form S-3 (File No. 333-263296) filed by the registrant on March 4, 2022, amended on February 24, 2023, and declared effective on March 2, 2023 (the Prior Registration Statement). The Registrant hereby offsets the total registration fee of $13,810.00 due under this registration statement by $6,952.50 (calculated at the fee rate in effect at the date of the Prior Registration Statement of $92.70 per million dollars), which represents the portion of the registration fee previously paid with respect to $75,000,000 of unsold securities previously registered under the Prior Registration Statement. The offering of the unsold securities registered under the Prior Registration Statement has been terminated.