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Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2016
Regulatory Capital Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following table summarizes both the Corporation’s and Banks’ capital ratios and the ratios required by their federal regulators at September 30, 2016 and December 31, 2015, respectively:
|  | Actual |  | Minimum Required for Capital Adequacy Purposes |  | Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements
|  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
|  | (Dollars in Thousands)
As of September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Total capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 200,175 |  |  | 11.44 | % |  | $ | 139,979 |  |  | 8.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 144,931 |  |  | 11.42 |  |  | 101,529 |  |  | 8.00 |  |  | $ | 126,912 |  |  | 10.00 | %
First Business Bank — Milwaukee |  | 23,437 |  |  | 11.12 |  |  | 16,868 |  |  | 8.00 |  |  | 21,085 |  |  | 10.00 |
Alterra Bank |  | 30,705 |  |  | 11.57 |  |  | 21,225 |  |  | 8.00 |  |  | 26,531 |  |  | 10.00 |
Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 157,876 |  |  | 9.02 | % |  | $ | 104,984 |  |  | 6.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 131,964 |  |  | 10.40 |  |  | 76,147 |  |  | 6.00 |  |  | $ | 101,529 |  |  | 8.00 | %
First Business Bank — Milwaukee |  | 21,357 |  |  | 10.13 |  |  | 12,651 |  |  | 6.00 |  |  | 16,868 |  |  | 8.00 |
Alterra Bank |  | 27,368 |  |  | 10.32 |  |  | 15,918 |  |  | 6.00 |  |  | 21,225 |  |  | 8.00 |
Common Equity Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 147,876 |  |  | 8.45 | % |  | $ | 78,738 |  |  | 4.50 | % |  | N/A |  |  | N/A |
First Business Bank |  | 131,964 |  |  | 10.40 |  |  | 57,110 |  |  | 4.50 |  |  | $ | 82,493 |  |  | 6.50 | %
First Business Bank — Milwaukee |  | 21,357 |  |  | 10.13 |  |  | 9,488 |  |  | 4.50 |  |  | 13,705 |  |  | 6.50 |
Alterra Bank |  | 27,368 |  |  | 10.32 |  |  | 11,939 |  |  | 4.50 |  |  | 17,245 |  |  | 6.50 |
Tier 1 leverage capital |  |  |  |  |  |  |  |  |  |  |  |
(to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 157,876 |  |  | 8.75 | % |  | $ | 72,204 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 131,964 |  |  | 10.34 |  |  | 51,065 |  |  | 4.00 |  |  | $ | 63,831 |  |  | 5.00 | %
First Business Bank — Milwaukee |  | 21,357 |  |  | 7.62 |  |  | 11,205 |  |  | 4.00 |  |  | 14,006 |  |  | 5.00 |
Alterra Bank |  | 27,368 |  |  | 9.60 |  |  | 11,400 |  |  | 4.00 |  |  | 14,250 |  |  | 5.00 |
|  | Actual |  | Minimum Required for Capital Adequacy Purposes |  | Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements
|  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
|  | (Dollars in Thousands)
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Total capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 189,163 |  |  | 11.11 | % |  | $ | 136,208 |  |  | 8.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 141,388 |  |  | 11.12 |  |  | 101,754 |  |  | 8.00 |  |  | $ | 127,193 |  |  | 10.00 | %
First Business Bank — Milwaukee |  | 20,931 |  |  | 12.03 |  |  | 13,914 |  |  | 8.00 |  |  | 17,392 |  |  | 10.00 |
Alterra Bank |  | 30,300 |  |  | 11.39 |  |  | 21,279 |  |  | 8.00 |  |  | 26,598 |  |  | 10.00 |
Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 149,920 |  |  | 8.81 | % |  | $ | 102,156 |  |  | 6.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 128,852 |  |  | 10.13 |  |  | 76,316 |  |  | 6.00 |  |  | $ | 101,754 |  |  | 8.00 | %
First Business Bank — Milwaukee |  | 19,172 |  |  | 11.02 |  |  | 10,435 |  |  | 6.00 |  |  | 13,914 |  |  | 8.00 |
Alterra Bank |  | 28,278 |  |  | 10.63 |  |  | 15,959 |  |  | 6.00 |  |  | 21,279 |  |  | 8.00 |
Common Equity Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 139,920 |  |  | 8.22 | % |  | $ | 76,617 |  |  | 4.50 | % |  | N/A |  |  | N/A |
First Business Bank |  | 128,852 |  |  | 10.13 |  |  | 57,237 |  |  | 4.50 |  |  | $ | 110,669 |  |  | 6.50 | %
First Business Bank — Milwaukee |  | 19,172 |  |  | 11.02 |  |  | 7,826 |  |  | 4.50 |  |  | 82,675 |  |  | 6.50 |
Alterra Bank |  | 28,278 |  |  | 10.63 |  |  | 11,969 |  |  | 4.50 |  |  | 11,305 |  |  | 6.50 |
Tier 1 leverage capital |  |  |  |  |  |  |  |  |  |  |  |
(to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 149,920 |  |  | 8.63 | % |  | $ | 69,466 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 128,852 |  |  | 10.44 |  |  | 49,359 |  |  | 4.00 |  |  | $ | 61,698 |  |  | 5.00 | %
First Business Bank — Milwaukee |  | 19,172 |  |  | 7.81 |  |  | 9,821 |  |  | 4.00 |  |  | 12,276 |  |  | 5.00 |
Alterra Bank |  | 28,278 |  |  | 9.89 |  |  | 11,441 |  |  | 4.00 |  |  | 14,301 |  |  | 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=35709795&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=35709795&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=35709795&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=35709795&loc=SL5958577-112826 + Details
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