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Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2025
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following tables summarize both the Corporation’s and the Bank’s capital ratios and the ratios required by their federal regulators:
|  | As of September 30, 2025
|  | Actual (1) |  | Minimum Required for Capital Adequacy Purposes |  | For Capital Adequacy Purposes Plus Capital Conservation Buffer |  | Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements
|  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
|  | (Dollars in Thousands)
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $452,731 |  | 12.18% |  | $297,419 |  | 8.00% |  | $390,363 |  | 10.50% |  | N/A |  | N/A
First Business Bank |  | 450,613 |  | 12.12 |  | 297,482 |  | 8.00 |  | 390,445 |  | 10.50 |  | $371,853 |  | 10.00%
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $359,409 |  | 9.67% |  | $223,064 |  | 6.00% |  | $316,008 |  | 8.50% |  | N/A |  | N/A
First Business Bank |  | 412,067 |  | 11.08 |  | 223,112 |  | 6.00 |  | 316,075 |  | 8.50 |  | $297,482 |  | 8.00%
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $347,417 |  | 9.34% |  | $167,298 |  | 4.50% |  | $260,242 |  | 7.00% |  | N/A |  | N/A
First Business Bank |  | 412,067 |  | 11.08 |  | 167,334 |  | 4.50 |  | 260,297 |  | 7.00 |  | $241,704 |  | 6.50%
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $359,409 |  | 8.87% |  | $162,031 |  | 4.00% |  | $162,031 |  | 4.00% |  | N/A |  | N/A
First Business Bank |  | 412,067 |  | 10.18 |  | 161,895 |  | 4.00 |  | 161,895 |  | 4.00 |  | $202,369 |  | 5.00%
|  | As of December 31, 2024
|  | Actual (1) |  | Minimum Required for Capital Adequacy Purposes |  | For Capital Adequacy Purposes Plus Capital Conservation Buffer |  | Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements
|  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
|  | (Dollars in Thousands)
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $421,639 |  | 12.08% |  | $279,330 |  | 8.00% |  | $366,621 |  | 10.50% |  | N/A |  | N/A
First Business Bank |  | 417,965 |  | 11.97 |  | 279,342 |  | 8.00 |  | 366,636 |  | 10.50 |  | $349,177 |  | 10.00%
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $329,796 |  | 9.45% |  | $209,498 |  | 6.00% |  | $296,788 |  | 8.50% |  | N/A |  | N/A
First Business Bank |  | 380,811 |  | 10.91 |  | 209,506 |  | 6.00 |  | 296,801 |  | 8.50 |  | $279,342 |  | 8.00%
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $317,804 |  | 9.10% |  | $157,123 |  | 4.50% |  | $244,414 |  | 7.00% |  | N/A |  | N/A
First Business Bank |  | 380,811 |  | 10.91 |  | 157,130 |  | 4.50 |  | 244,424 |  | 7.00 |  | $226,965 |  | 6.50%
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $329,796 |  | 8.78% |  | $150,256 |  | 4.00% |  | $150,256 |  | 4.00% |  | N/A |  | N/A
First Business Bank |  | 380,811 |  | 10.17 |  | 150,207 |  | 4.00 |  | 150,207 |  | 4.00 |  | $187,759 |  | 5.00%
(1) 2025 and 2024 capital amounts include $338,000 and $677,000, respectively, of additional stockholders’ equity as elected by the Corporation and permitted by federal banking regulatory agencies related to the adoption of ASC 326. Risk-weighted assets were also adjusted accordingly.

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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