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Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2018
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 March 31, 2018 and December 31, 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 March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 216,519 |  |  | 11.78 | % |  | $ | 147,099 |  |  | 8.00 | % |  | $ | 181,575 |  |  | 9.875 | % |  | N/A |  |  | N/A |
First Business Bank |  | 209,579 |  |  | 11.45 |  |  | 146,437 |  |  | 8.00 |  |  | 180,758 |  |  | 9.875 |  |  | $ | 183,046 |  |  | 10.00 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 171,638 |  |  | 9.33 | % |  | $ | 110,324 |  |  | 6.00 | % |  | $ | 144,801 |  |  | 7.875 | % |  | N/A |  |  | N/A |
First Business Bank |  | 188,425 |  |  | 10.29 |  |  | 109,828 |  |  | 6.00 |  |  | 144,149 |  |  | 7.875 |  |  | $ | 146,437 |  |  | 8.00 | %
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 161,616 |  |  | 8.79 | % |  | $ | 82,743 |  |  | 4.50 | % |  | $ | 117,219 |  |  | 6.375 | % |  | N/A |  |  | N/A |
First Business Bank |  | 188,425 |  |  | 10.29 |  |  | 82,371 |  |  | 4.50 |  |  | 116,692 |  |  | 6.375 |  |  | $ | 118,980 |  |  | 6.50 | %
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 171,638 |  |  | 9.26 | % |  | $ | 74,127 |  |  | 4.00 | % |  | $ | 74,127 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 188,425 |  |  | 10.19 |  |  | 73,929 |  |  | 4.00 |  |  | 73,929 |  |  | 4.00 |  |  | $ | 92,412 |  |  | 5.00 | %
|  | 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, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 214,501 |  |  | 11.98 | % |  | $ | 143,219 |  |  | 8.00 | % |  | $ | 165,597 |  |  | 9.250 | % |  | N/A |  |  | N/A |
First Business Bank |  | 207,986 |  |  | 11.66 |  |  | 142,736 |  |  | 8.00 |  |  | 165,038 |  |  | 9.250 |  |  | $ | 178,420 |  |  | 10.00 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 169,176 |  |  | 9.45 | % |  | $ | 107,414 |  |  | 6.00 | % |  | $ | 129,792 |  |  | 7.250 | % |  | N/A |  |  | N/A |
First Business Bank |  | 186,374 |  |  | 10.45 |  |  | 107,052 |  |  | 6.00 |  |  | 129,354 |  |  | 7.250 |  |  | $ | 142,736 |  |  | 8.00 | %
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 159,157 |  |  | 8.89 | % |  | $ | 80,561 |  |  | 4.50 | % |  | $ | 102,939 |  |  | 5.750 | % |  | N/A |  |  | N/A |
First Business Bank |  | 186,374 |  |  | 10.45 |  |  | 80,289 |  |  | 4.50 |  |  | 102,591 |  |  | 5.750 |  |  | $ | 115,973 |  |  | 6.50 | %
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 169,176 |  |  | 9.54 | % |  | $ | 70,920 |  |  | 4.00 | % |  | $ | 70,920 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 186,374 |  |  | 10.56 |  |  | 70,617 |  |  | 4.00 |  |  | 70,617 |  |  | 4.00 |  |  | $ | 88,272 |  |  | 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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