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Stockholders' Equity and Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2018
Regulatory Capital Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following tables summarizes the Bank’s capital ratios and the ratios required by their federal regulator at December 31, 2018:
|  | 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, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
First Business Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  | $ | 220,474 |  |  | 11.49 | % |  | $ | 153,456 |  |  | 8.00 | % |  | $ | 189,422 |  |  | 9.875 | % |  | $ | 191,820 |  |  | 10.00 | %
Tier 1 capital (to risk-weighted assets) |  | 197,093 |  |  | 10.27 |  |  | 115,092 |  |  | 6.00 |  |  | 151,058 |  |  | 7.88 |  |  | 153,456 |  |  | 8.00 |
Common equity tier 1 capital (to risk-weighted assets) |  | 197,093 |  |  | 10.27 |  |  | 86,319 |  |  | 4.50 |  |  | 122,285 |  |  | 6.375 |  |  | 124,683 |  |  | 6.50 |
Tier 1 leverage capital (to adjusted assets) |  | 197,093 |  |  | 10.20 |  |  | 77,301 |  |  | 4.00 |  |  | 77,301 |  |  | 4.00 |  |  | 96,626 |  |  | 5.00 |
The following table summarizes both the Corporation’s and Bank’s capital ratios and the ratios required by their federal regulators at 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 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 | %
Reconciliation of stockholders' equity to federal regulatory capital | The following table reconciles stockholders’ equity to federal regulatory capital at December 31, 2018 and 2017, respectively:
|  | As of December 31,
|  | 2018 |  | 2017
|  | (In Thousands)
Stockholders’ equity of the Corporation |  | $ | 180,707 |  |  | $ | 169,278 |
Net unrealized and accumulated losses on specific items |  | 1,684 |  |  | 1,238 |
Disallowed servicing assets |  | (751 | ) |  | (848 | )
Disallowed goodwill and other intangibles |  | (10,498 | ) |  | (10,511 | )
Junior subordinated notes |  | 10,033 |  |  | 10,019 |
Tier 1 capital |  | 181,175 |  |  | 169,176 |
Allowable general valuation allowances and subordinated debt |  | 47,150 |  |  | 45,325 |
Total capital |  | $ | 228,325 |  |  | $ | 214,501 |

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