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Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2016
Regulatory Capital Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following table summarizes the Corporation’s and Banks’ capital ratios and the ratios required by their federal regulators at March 31, 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 March 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Total capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 192,670 |  |  | 11.24 | % |  | $ | 137,131 |  |  | 8.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 145,732 |  |  | 11.43 |  |  | 102,002 |  |  | 8.00 |  |  | $ | 127,502 |  |  | 10.00 | %
First Business Bank — Milwaukee |  | 21,170 |  |  | 11.74 |  |  | 14,425 |  |  | 8.00 |  |  | 18,032 |  |  | 10.00 |
Alterra Bank |  | 31,464 |  |  | 12.37 |  |  | 20,345 |  |  | 8.00 |  |  | 25,432 |  |  | 10.00 |
Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 153,531 |  |  | 8.96 | % |  | $ | 102,848 |  |  | 6.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 132,943 |  |  | 10.43 |  |  | 76,501 |  |  | 6.00 |  |  | $ | 102,002 |  |  | 8.00 | %
First Business Bank — Milwaukee |  | 19,350 |  |  | 10.73 |  |  | 10,819 |  |  | 6.00 |  |  | 14,425 |  |  | 8.00 |
Alterra Bank |  | 29,390 |  |  | 11.56 |  |  | 15,259 |  |  | 6.00 |  |  | 20,345 |  |  | 8.00 |
Common equity tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 143,531 |  |  | 8.37 | % |  | $ | 77,136 |  |  | 4.50 | % |  | N/A |  |  | N/A |
First Business Bank |  | 132,943 |  |  | 10.43 |  |  | 57,376 |  |  | 4.50 |  |  | $ | 82,877 |  |  | 6.50 | %
First Business Bank — Milwaukee |  | 19,350 |  |  | 10.73 |  |  | 8,114 |  |  | 4.50 |  |  | 11,721 |  |  | 6.50 |
Alterra Bank |  | 29,390 |  |  | 11.56 |  |  | 11,444 |  |  | 4.50 |  |  | 16,530 |  |  | 6.50 |
Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to average assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 153,531 |  |  | 8.44 | % |  | $ | 72,805 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 132,943 |  |  | 10.30 |  |  | 51,647 |  |  | 4.00 |  |  | $ | 64,559 |  |  | 5.00 | %
First Business Bank — Milwaukee |  | 19,350 |  |  | 7.38 |  |  | 10,485 |  |  | 4.00 |  |  | 13,106 |  |  | 5.00 |
Alterra Bank |  | 29,390 |  |  | 9.45 |  |  | 12,440 |  |  | 4.00 |  |  | 15,551 |  |  | 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 capital |  |  |  |  |  |  |  |  |  |  |  |
(to average 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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