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Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2015
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, 2015 and December 31, 2014, 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, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Total capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 177,594 |  |  | 11.40 | % |  | $ | 124,677 |  |  | 8.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 133,667 |  |  | 11.47 |  |  | 93,216 |  |  | 8.00 |  |  | $ | 116,544 |  |  | 10.00 | %
First Business Bank — Milwaukee |  | 19,215 |  |  | 12.17 |  |  | 12,626 |  |  | 8.00 |  |  | 15,783 |  |  | 10.00 |
Alterra Bank |  | 26,346 |  |  | 11.05 |  |  | 19,072 |  |  | 8.00 |  |  | 23,841 |  |  | 10.00 |
Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 139,974 |  |  | 8.98 | % |  | $ | 93,508 |  |  | 6.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 121,166 |  |  | 10.40 |  |  | 69,912 |  |  | 6.00 |  |  | $ | 93,235 |  |  | 8.00 | %
First Business Bank — Milwaukee |  | 17,721 |  |  | 11.23 |  |  | 9,470 |  |  | 6.00 |  |  | 12,626 |  |  | 8.00 |
Alterra Bank |  | 25,647 |  |  | 10.76 |  |  | 14,304 |  |  | 6.00 |  |  | 19,073 |  |  | 8.00 |
Common equity Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 129,974 |  |  | 8.34 | % |  | $ | 70,131 |  |  | 4.50 | % |  | N/A |  |  | N/A |
First Business Bank |  | 121,166 |  |  | 10.40 |  |  | 52,434 |  |  | 4.50 |  |  | $ | 101,318 |  |  | 6.50 | %
First Business Bank — Milwaukee |  | 17,721 |  |  | 11.23 |  |  | 7,102 |  |  | 4.50 |  |  | 75,753 |  |  | 6.50 |
Alterra Bank |  | 25,647 |  |  | 10.76 |  |  | 10,728 |  |  | 4.50 |  |  | 10,259 |  |  | 6.50 |
Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to average assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 139,974 |  |  | 8.42 | % |  | $ | 5,199 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 121,166 |  |  | 10.33 |  |  | 4,847 |  |  | 4.00 |  |  | $ | 6,061 |  |  | 5.00 | %
First Business Bank — Milwaukee |  | 17,721 |  |  | 7.56 |  |  | 709 |  |  | 4.00 |  |  | 886 |  |  | 5.00 |
Alterra Bank |  | 25,647 |  |  | 9.68 |  |  | 1,026 |  |  | 4.00 |  |  | 1,270 |  |  | 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, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Total capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 173,263 |  |  | 12.13 | % |  | $ | 114,253 |  |  | 8.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 131,411 |  |  | 12.19 |  |  | 86,272 |  |  | 8.00 |  |  | $ | 107,841 |  |  | 10.00 | %
First Business Bank — Milwaukee |  | 19,128 |  |  | 12.47 |  |  | 12,274 |  |  | 8.00 |  |  | 15,343 |  |  | 10.00 |
Alterra Bank |  | 22,657 |  |  | 10.90 |  |  | 16,628 |  |  | 8.00 |  |  | 20,785 |  |  | 10.00 |
Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 136,008 |  |  | 9.52 |  |  | $ | 57,127 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 118,907 |  |  | 11.03 |  |  | 43,136 |  |  | 4.00 |  |  | $ | 64,704 |  |  | 6.00 | %
First Business Bank — Milwaukee |  | 17,641 |  |  | 11.50 |  |  | 6,137 |  |  | 4.00 |  |  | 9,206 |  |  | 6.00 |
Alterra Bank |  | 22,320 |  |  | 10.74 |  |  | 8,314 |  |  | 4.00 |  |  | 12,471 |  |  | 6.00 |
Tier 1 capital |  |  |  |  |  |  |  |  |  |  |  |
(to average assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 136,008 |  |  | 8.71 |  |  | $ | 62,490 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 118,907 |  |  | 10.13 |  |  | 46,960 |  |  | 4.00 |  |  | $ | 58,700 |  |  | 5.00 | %
First Business Bank — Milwaukee |  | 17,641 |  |  | 7.90 |  |  | 8,935 |  |  | 4.00 |  |  | 11,169 |  |  | 5.00 |
Alterra Bank |  | 22,320 |  |  | 9.01 |  |  | 9,910 |  |  | 4.00 |  |  | 12,388 |  |  | 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 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 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 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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