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Stockholders' Equity and Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2016
Regulatory Capital Requirements [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations | The following table summarizes both the Corporation’s and Banks’ capital ratios and the ratios required by their federal regulators at December 31, 2016 and 2015, respectively:
|  | 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, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 204,117 |  |  | 11.74 | % |  | $ | 139,101 |  |  | 8.00 | % |  | $ | 149,968 |  |  | 8.625 | % |  | N/A |  |  | N/A |
First Business Bank |  | 147,811 |  |  | 11.55 |  |  | 102,362 |  |  | 8.00 |  |  | 110,360 |  |  | 8.625 |  |  | $ | 127,953 |  |  | 10.00 | %
First Business Bank – Milwaukee |  | 24,347 |  |  | 11.02 |  |  | 17,680 |  |  | 8.00 |  |  | 19,062 |  |  | 8.625 |  |  | 22,101 |  |  | 10.00 |
Alterra Bank |  | 31,699 |  |  | 13.27 |  |  | 19,106 |  |  | 8.00 |  |  | 20,599 |  |  | 8.625 |  |  | 23,882 |  |  | 10.00 |
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 160,964 |  |  | 9.26 |  |  | $ | 104,326 |  |  | 6.00 |  |  | $ | 115,193 |  |  | 6.625 | % |  | N/A |  |  | N/A |
First Business Bank |  | 134,208 |  |  | 10.49 |  |  | 76,772 |  |  | 6.00 |  |  | 84,769 |  |  | 6.625 |  |  | $ | 102,362 |  |  | 8.00 |
First Business Bank – Milwaukee |  | 22,323 |  |  | 10.10 |  |  | 13,260 |  |  | 6.00 |  |  | 14,642 |  |  | 6.625 |  |  | 17,680 |  |  | 8.00 |
Alterra Bank |  | 28,685 |  |  | 12.01 |  |  | 14,329 |  |  | 6.00 |  |  | 15,822 |  |  | 6.625 |  |  | 19,106 |  |  | 8.00 |
Common equity tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 150,960 |  |  | 8.68 |  |  | $ | 78,244 |  |  | 4.50 |  |  | $ | 89,111 |  |  | 5.125 | % |  | N/A |  |  | N/A |
First Business Bank |  | 134,208 |  |  | 10.49 |  |  | 57,579 |  |  | 4.50 |  |  | 65,576 |  |  | 5.125 |  |  | $ | 83,170 |  |  | 6.50 |
First Business Bank – Milwaukee |  | 22,323 |  |  | 10.10 |  |  | 9,945 |  |  | 4.50 |  |  | 11,327 |  |  | 5.125 |  |  | 14,365 |  |  | 6.50 |
Alterra Bank |  | 28,685 |  |  | 12.01 |  |  | 10,747 |  |  | 4.50 |  |  | 12,240 |  |  | 5.125 |  |  | 15,524 |  |  | 6.50 |
Tier 1 leverage capital (to adjusted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 160,964 |  |  | 9.07 |  |  | $ | 70,985 |  |  | 4.00 |  |  | $ | 70,985 |  |  | 4.00 | % |  | N/A |  |  | N/A |
First Business Bank |  | 134,208 |  |  | 10.40 |  |  | 51,600 |  |  | 4.00 |  |  | 51,600 |  |  | 4.00 |  |  | $ | 64,500 |  |  | 5.00 |
First Business Bank – Milwaukee |  | 22,323 |  |  | 9.15 |  |  | 9,758 |  |  | 4.00 |  |  | 9,758 |  |  | 4.00 |  |  | 12,198 |  |  | 5.00 |
Alterra Bank |  | 28,685 |  |  | 10.58 |  |  | 10,842 |  |  | 4.00 |  |  | 10,842 |  |  | 4.00 |  |  | 13,552 |  |  | 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, 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 leverage capital (to adjusted 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 |
Reconciliation of stockholders' equity to federal regulatory capital | The following table reconciles stockholders’ equity to federal regulatory capital at December 31, 2016 and 2015, respectively:
|  | As of December 31,
|  | 2016 |  | 2015
|  | (In Thousands)
Stockholders’ equity of the Corporation |  | $ | 161,650 |  |  | $ | 150,832 |
Net unrealized and accumulated losses on specific items |  | 522 |  |  | 80 |
Disallowed servicing assets |  | (652 | ) |  | (370 | )
Disallowed goodwill and other intangibles |  | (10,560 | ) |  | (10,622 | )
Junior subordinated notes |  | 10,004 |  |  | 10,000 |
Tier 1 capital |  | 160,964 |  |  | 149,920 |
Allowable general valuation allowances and subordinated debt |  | 43,153 |  |  | 39,243 |
Total capital |  | $ | 204,117 |  |  | $ | 189,163 |

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