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Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2017
Regulatory Capital Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following table summarizes both the Corporation’s and Bank’s capital ratios and the ratios required by their federal regulators at September 30, 2017:
|  | 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)
As of September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 209,495 |  |  | 11.91 | % |  | $ | 140,737 |  |  | 8.00 | % |  | $ | 162,727 |  |  | 9.25 | % |  | N/A |  |  | N/A |
First Business Bank |  | 205,877 |  |  | 11.75 |  |  | 140,132 |  |  | 8.00 |  |  | 162,027 |  |  | 9.25 |  |  | $ | 175,164 |  |  | 10.00 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 165,873 |  |  | 9.43 | % |  | $ | 105,553 |  |  | 6.00 | % |  | $ | 127,543 |  |  | 7.25 | % |  | N/A |  |  | N/A |
First Business Bank |  | 185,954 |  |  | 10.62 |  |  | 105,099 |  |  | 6.00 |  |  | 126,994 |  |  | 7.25 |  |  | $ | 140,132 |  |  | 8.00 | %
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 155,858 |  |  | 8.86 | % |  | $ | 79,164 |  |  | 4.50 | % |  | $ | 101,155 |  |  | 5.75 | % |  | N/A |  |  | N/A |
First Business Bank |  | 185,954 |  |  | 10.62 |  |  | 78,824 |  |  | 4.50 |  |  | 100,720 |  |  | 5.75 |  |  | $ | 113,857 |  |  | 6.50 | %
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 165,873 |  |  | 9.39 | % |  | $ | 70,654 |  |  | 4.00 | % |  | $ | 70,654 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 185,954 |  |  | 10.56 |  |  | 70,409 |  |  | 4.00 |  |  | 70,409 |  |  | 4.00 |  |  | $ | 88,011 |  |  | 5.00 | %
The following table summarizes both the Corporation’s and the Corporation’s legacy bank charters’ ratios and the ratios required by their federal regulators at December 31, 2016:
|  | 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)
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 204,117 |  |  | 11.74 | % |  | $ | 139,101 |  |  | 8.00 | % |  | $ | 149,968 |  |  | 8.625 | % |  | N/A |  |  | N/A |
First Business Bank |  | 147,811 |  |  | 11.55 |  |  | 102,362 |  |  | 8.00 |  |  | 110,360 |  |  | 8.625 |  |  | $ | 127,953 |  |  | 10.00 | %
First Business Bank — Milwaukee |  | 24,347 |  |  | 11.02 |  |  | 17,680 |  |  | 8.00 |  |  | 19,062 |  |  | 8.625 |  |  | 22,101 |  |  | 10.00 |
Alterra Bank |  | 31,699 |  |  | 13.27 |  |  | 19,106 |  |  | 8.00 |  |  | 20,599 |  |  | 8.625 |  |  | 23,882 |  |  | 10.00 |
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 160,964 |  |  | 9.26 | % |  | $ | 104,326 |  |  | 6.00 | % |  | $ | 115,193 |  |  | 6.625 | % |  | N/A |  |  | N/A |
First Business Bank |  | 134,208 |  |  | 10.49 |  |  | 76,772 |  |  | 6.00 |  |  | 84,769 |  |  | 6.625 |  |  | $ | 102,362 |  |  | 8.00 | %
First Business Bank — Milwaukee |  | 22,323 |  |  | 10.10 |  |  | 13,260 |  |  | 6.00 |  |  | 14,642 |  |  | 6.625 |  |  | 17,680 |  |  | 8.00 |
Alterra Bank |  | 28,685 |  |  | 12.01 |  |  | 14,329 |  |  | 6.00 |  |  | 15,822 |  |  | 6.625 |  |  | 19,106 |  |  | 8.00 |
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 150,960 |  |  | 8.68 | % |  | $ | 78,244 |  |  | 4.50 | % |  | $ | 89,111 |  |  | 5.125 | % |  | N/A |  |  | N/A |
First Business Bank |  | 134,208 |  |  | 10.49 |  |  | 57,579 |  |  | 4.50 |  |  | 65,576 |  |  | 5.125 |  |  | $ | 83,170 |  |  | 6.50 | %
First Business Bank — Milwaukee |  | 22,323 |  |  | 10.10 |  |  | 9,945 |  |  | 4.50 |  |  | 11,327 |  |  | 5.125 |  |  | 14,365 |  |  | 6.50 |
Alterra Bank |  | 28,685 |  |  | 12.01 |  |  | 10,747 |  |  | 4.50 |  |  | 12,240 |  |  | 5.125 |  |  | 15,524 |  |  | 6.50 |
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 160,964 |  |  | 9.07 | % |  | $ | 70,985 |  |  | 4.00 | % |  | $ | 70,985 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 134,208 |  |  | 10.40 |  |  | 51,600 |  |  | 4.00 |  |  | 51,600 |  |  | 4.00 |  |  | $ | 64,500 |  |  | 5.00 | %
First Business Bank — Milwaukee |  | 22,323 |  |  | 9.15 |  |  | 9,758 |  |  | 4.00 |  |  | 9,758 |  |  | 4.00 |  |  | 12,198 |  |  | 5.00 |
Alterra Bank |  | 28,685 |  |  | 10.58 |  |  | 10,842 |  |  | 4.00 |  |  | 10,842 |  |  | 4.00 |  |  | 13,552 |  |  | 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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