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Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 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 |  | $429,351 |  | 12.20% |  | $281,582 |  | 8.00% |  | $369,576 |  | 10.50% |  | N/A |  | N/A
First Business Bank |  | 427,481 |  | 12.15 |  | 281,580 |  | 8.00 |  | 369,574 |  | 10.50 |  | $351,975 |  | 10.00%
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $337,859 |  | 9.60% |  | $211,186 |  | 6.00% |  | $299,180 |  | 8.50% |  | N/A |  | N/A
First Business Bank |  | 390,705 |  | 11.10 |  | 211,185 |  | 6.00 |  | 299,179 |  | 8.50 |  | $281,580 |  | 8.00%
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $325,867 |  | 9.26% |  | $158,390 |  | 4.50% |  | $246,384 |  | 7.00% |  | N/A |  | N/A
First Business Bank |  | 390,705 |  | 11.10 |  | 158,389 |  | 4.50 |  | 246,383 |  | 7.00 |  | $228,784 |  | 6.50%
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $337,859 |  | 8.77% |  | $154,158 |  | 4.00% |  | $154,158 |  | 4.00% |  | N/A |  | N/A
First Business Bank |  | 390,705 |  | 10.15 |  | 154,047 |  | 4.00 |  | 154,047 |  | 4.00 |  | $192,559 |  | 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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