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Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2018
Regulatory Capital Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following tables summarize both the Corporation’s and Bank’s capital ratios and the ratios required by their federal regulators:
|  | 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, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 225,160 |  |  | 12.05 | % |  | $ | 149,515 |  |  | 8.00 | % |  | $ | 184,558 |  |  | 9.875 | % |  | N/A |  |  | N/A
First Business Bank |  | 217,620 |  |  | 11.70 |  |  | 148,847 |  |  | 8.00 |  |  | 183,733 |  |  | 9.875 |  |  | 186,058 |  |  | 10.00
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 178,220 |  |  | 9.54 | % |  | $ | 112,136 |  |  | 6.00 | % |  | $ | 147,179 |  |  | 7.875 | % |  | N/A |  |  | N/A
First Business Bank |  | 194,435 |  |  | 10.45 |  |  | 111,635 |  |  | 6.00 |  |  | 146,521 |  |  | 7.875 |  |  | 148,847 |  |  | 8.00
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 168,191 |  |  | 9.00 | % |  | $ | 84,102 |  |  | 4.50 | % |  | $ | 119,145 |  |  | 6.375 | % |  | N/A |  |  | N/A
First Business Bank |  | 194,435 |  |  | 10.45 |  |  | 83,726 |  |  | 4.50 |  |  | 118,612 |  |  | 6.375 |  |  | 120,938 |  |  | 6.50
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 178,220 |  |  | 9.34 | % |  | $ | 76,324 |  |  | 4.00 | % |  | $ | 76,324 |  |  | 4.00 | % |  | N/A |  |  | N/A
First Business Bank |  | 194,435 |  |  | 10.24 |  |  | 75,968 |  |  | 4.00 |  |  | 75,968 |  |  | 4.00 |  |  | 94,961 |  |  | 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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