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Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following tables summarize the Bank’s capital ratios and the ratios required by its federal regulator:
|  | As of September 30, 2019
|  | Actual |  | 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)
First Business Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  | $ | 231,159 |  |  | 11.69 | % |  | $ | 158,238 |  |  | 8.00 | % |  | $ | 207,687 |  |  | 10.50 | % |  | $ | 197,797 |  |  | 10.00 | %
Tier 1 capital (to risk-weighted assets) |  | 209,346 |  |  | 10.58 |  |  | 118,678 |  |  | 6.00 |  |  | 168,127 |  |  | 8.50 |  |  | 158,238 |  |  | 8.00 |
Common equity tier 1 capital (to risk-weighted assets) |  | 209,346 |  |  | 10.58 |  |  | 89,009 |  |  | 4.50 |  |  | 138,458 |  |  | 7.00 |  |  | 128,568 |  |  | 6.50 |
Tier 1 leverage capital (to adjusted assets) |  | 209,346 |  |  | 10.10 |  |  | 82,907 |  |  | 4.00 |  |  | 82,907 |  |  | 4.00 |  |  | 103,633 |  |  | 5.00 |
|  | As of December 31, 2018
|  | Actual |  | 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)
First Business Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  | $ | 220,474 |  |  | 11.49 | % |  | $ | 153,456 |  |  | 8.00 | % |  | $ | 189,422 |  |  | 9.875 | % |  | $ | 191,820 |  |  | 10.00 | %
Tier 1 capital (to risk-weighted assets) |  | 197,093 |  |  | 10.27 |  |  | 115,092 |  |  | 6.00 |  |  | 151,058 |  |  | 7.875 |  |  | 153,456 |  |  | 8.00 |
Common equity tier 1 capital (to risk-weighted assets) |  | 197,093 |  |  | 10.27 |  |  | 86,319 |  |  | 4.50 |  |  | 122,285 |  |  | 6.375 |  |  | 124,683 |  |  | 6.50 |
Tier 1 leverage capital (to adjusted assets) |  | 197,093 |  |  | 10.20 |  |  | 77,301 |  |  | 4.00 |  |  | 77,301 |  |  | 4.00 |  |  | 96,626 |  |  | 5.00 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958577-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 + Details
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