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Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2019
Regulatory Capital Requirements [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 March 31, 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) |  | $ | 224,649 |  |  | 11.83 | % |  | $ | 151,978 |  |  | 8.00 | % |  | $ | 199,472 |  |  | 10.50 | % |  | $ | 189,973 |  |  | 10.00 | %
Tier 1 capital (to risk-weighted assets) |  | 200,924 |  |  | 10.58 |  |  | 113,984 |  |  | 6.00 |  |  | 161,477 |  |  | 8.50 |  |  | 151,978 |  |  | 8.00 |
Common equity tier 1 capital (to risk-weighted assets) |  | 200,924 |  |  | 10.58 |  |  | 85,488 |  |  | 4.50 |  |  | 132,981 |  |  | 7.00 |  |  | 123,482 |  |  | 6.50 |
Tier 1 leverage capital (to adjusted assets) |  | 200,924 |  |  | 10.28 |  |  | 78,152 |  |  | 4.00 |  |  | 78,152 |  |  | 4.00 |  |  | 97,691 |  |  | 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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