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Stockholders' Equity and Regulatory Capital (Tables) | 12 Months Ended
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Dec. 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 December 31, 2015 and 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 December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 189,163 |  |  | 11.11 | % |  | $ | 136,208 |  |  | 8.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 141,388 |  |  | 11.12 |  |  | 101,754 |  |  | 8.00 |  |  | $ | 127,193 |  |  | 10.00 | %
First Business Bank – Milwaukee |  | 20,931 |  |  | 12.03 |  |  | 13,914 |  |  | 8.00 |  |  | 17,392 |  |  | 10.00 |
Alterra Bank |  | 30,300 |  |  | 11.39 |  |  | 21,279 |  |  | 8.00 |  |  | 26,598 |  |  | 10.00 |
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 149,920 |  |  | 8.81 |  |  | $ | 102,156 |  |  | 6.00 |  |  | N/A |  |  | N/A |
First Business Bank |  | 128,852 |  |  | 10.13 |  |  | 76,316 |  |  | 6.00 |  |  | $ | 101,754 |  |  | 8.00 |
First Business Bank – Milwaukee |  | 19,172 |  |  | 11.02 |  |  | 10,435 |  |  | 6.00 |  |  | 13,914 |  |  | 8.00 |
Alterra Bank |  | 28,278 |  |  | 10.63 |  |  | 15,959 |  |  | 6.00 |  |  | 21,279 |  |  | 8.00 |
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 139,920 |  |  | 8.22 |  |  | $ | 76,617 |  |  | 4.50 |  |  | N/A |  |  | N/A |
First Business Bank |  | 128,852 |  |  | 10.13 |  |  | 57,237 |  |  | 4.50 |  |  | $ | 110,669 |  |  | 6.50 |
First Business Bank — Milwaukee |  | 19,172 |  |  | 11.02 |  |  | 7,826 |  |  | 4.50 |  |  | 82,675 |  |  | 6.50 |
Alterra Bank |  | 28,278 |  |  | 10.63 |  |  | 11,969 |  |  | 4.50 |  |  | 11,305 |  |  | 6.50 |
Tier 1 capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 149,920 |  |  | 8.63 |  |  | $ | 69,466 |  |  | 4.00 |  |  | N/A |  |  | N/A |
First Business Bank |  | 128,852 |  |  | 10.44 |  |  | 49,359 |  |  | 4.00 |  |  | $ | 61,698 |  |  | 5.00 |
First Business Bank – Milwaukee |  | 19,172 |  |  | 7.81 |  |  | 9,821 |  |  | 4.00 |  |  | 12,276 |  |  | 5.00 |
Alterra Bank |  | 28,278 |  |  | 9.89 |  |  | 11,441 |  |  | 4.00 |  |  | 14,301 |  |  | 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 |
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 |
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 |
Reconciliation of stockholders' equity to federal regulatory capital | The following table reconciles stockholders’ equity to federal regulatory capital at December 31, 2015 and 2014, respectively.
|  | As of December 31,
|  | 2015 |  | 2014
|  | (In Thousands)
Stockholders’ equity of the Corporation |  | $ | 150,832 |  |  | $ | 137,748 |
Unrealized and accumulated (gains) losses on specific items |  | 80 |  |  | (652 | )
Disallowed servicing assets and purchased credit card relationships |  | (370 | ) |  | (94 | )
Disallowed goodwill and other intangibles |  | (10,622 | ) |  | (10,994 | )
Trust preferred securities |  | 10,000 |  |  | 10,000 |
Tier 1 capital |  | 149,920 |  |  | 136,008 |
Allowable general valuation allowances and subordinated debt |  | 39,243 |  |  | 37,255 |
Risk-based capital |  | $ | 189,163 |  |  | $ | 173,263 |

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