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Stockholders' Equity and Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2019
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following tables summarize both the Corporation’s and the Bank’s capital ratios and the ratios required by their federal regulators:
|  | As of December 31, 2019
|  | 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)
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 239,029 |  |  | 12.01 | % |  | $ | 159,185 |  |  | 8.00 | % |  | $ | 208,930 |  |  | 10.50 | % |  | N/A |  |  | N/A |
First Business Bank |  | $ | 233,181 |  |  | 11.79 | % |  | $ | 158,177 |  |  | 8.00 | % |  | $ | 207,607 |  |  | 10.50 | % |  | $ | 197,721 |  |  | 10.00 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 194,456 |  |  | 9.77 | % |  | $ | 119,388 |  |  | 6.00 | % |  | $ | 169,134 |  |  | 8.50 | % |  | N/A |  |  | N/A |
First Business Bank |  | 212,315 |  |  | 10.74 |  |  | 118,633 |  |  | 6.00 |  |  | 168,063 |  |  | 8.50 |  |  | 158,177 |  |  | 8.00 |
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 184,409 |  |  | 9.27 | % |  | $ | 89,541 |  |  | 4.50 | % |  | $ | 139,286 |  |  | 7.70 | % |  | N/A |  |  | N/A |
First Business Bank |  | 212,315 |  |  | 10.74 |  |  | 88,974 |  |  | 4.50 |  |  | 138,405 |  |  | 7.00 |  |  | 128,519 |  |  | 6.50 |
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 194,456 |  |  | 9.27 | % |  | $ | 83,950 |  |  | 4.00 | % |  | $ | 83,950 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 212,315 |  |  | 10.18 |  |  | 83,414 |  |  | 4.00 |  |  | 83,414 |  |  | 4.00 |  |  | 104,268 |  |  | 5.00 |
|  | As of 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)
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 228,325 |  |  | 11.85 | % |  | $ | 154,080 |  |  | 8.00 | % |  | $ | 190,192 |  |  | 9.875 | % |  | N/A |  |  | N/A |
First Business Bank |  | 220,474 |  |  | 11.49 |  |  | 153,456 |  |  | 8.00 |  |  | 189,422 |  |  | 9.875 |  |  | $ | 191,820 |  |  | 10.00 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 181,175 |  |  | 9.41 | % |  | $ | 115,560 |  |  | 6.00 | % |  | $ | 151,672 |  |  | 7.875 | % |  | N/A |  |  | N/A |
First Business Bank |  | 197,093 |  |  | 10.27 |  |  | 115,092 |  |  | 6.00 |  |  | 151,058 |  |  | 7.875 |  |  | $ | 153,456 |  |  | 8.00 | %
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 171,142 |  |  | 8.89 | % |  | $ | 86,670 |  |  | 4.50 | % |  | $ | 122,782 |  |  | 6.375 | % |  | N/A |  |  | N/A |
First Business Bank |  | 197,093 |  |  | 10.27 |  |  | 86,319 |  |  | 4.50 |  |  | 122,285 |  |  | 6.375 |  |  | $ | 124,683 |  |  | 6.50 | %
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 181,175 |  |  | 9.33 | % |  | $ | 77,648 |  |  | 4.00 | % |  | $ | 77,648 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 197,093 |  |  | 10.20 |  |  | 77,301 |  |  | 4.00 |  |  | 77,301 |  |  | 4.00 |  |  | $ | 96,626 |  |  | 5.00 | %
Reconciliation of stockholders' equity to federal regulatory capital | The following table reconciles stockholders’ equity to federal regulatory capital at December 31, 2019 and 2018, respectively:
|  | As of December 31,
|  | 2019 |  | 2018
|  | (In Thousands)
Stockholders’ equity of the Corporation |  | $ | 194,156 |  |  | $ | 180,707 |
Net unrealized and accumulated losses on specific items |  | 1,348 |  |  | 1,684 |
Disallowed servicing assets |  | (629 | ) |  | (751 | )
Disallowed goodwill and other intangibles |  | (10,466 | ) |  | (10,498 | )
Junior subordinated notes |  | 10,047 |  |  | 10,033 |
Tier 1 capital |  | 194,456 |  |  | 181,175 |
Allowable general valuation allowances and subordinated debt |  | 44,573 |  |  | 47,150 |
Total capital |  | $ | 239,029 |  |  | $ | 228,325 |

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