Stockholders' Equity and Regulatory Capital (Regulatory Capital Ratios) (Details) - USD ($)
$ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
| Compliance with Regulatory Capital Requirements under Banking Regulations |
|
|
| Total Capital |
$ 204,117
|
$ 189,163
|
| Total Capital to Risk-Weighted Assets |
11.74%
|
11.11%
|
| Total Capital, Minimum Required for Capital Adequacy Purposes |
$ 139,101
|
$ 136,208
|
| Total Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes |
8.00%
|
8.00%
|
| Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 149,968
|
|
| Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
8.625%
|
|
| Tier 1 capital |
$ 160,964
|
$ 149,920
|
| Tier 1 Capital to Risk-Weighted Assets |
9.26%
|
8.81%
|
| Tier 1 Capital, Minimum Required for Capital Adequacy Purposes |
$ 104,326
|
$ 102,156
|
| Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes |
6.00%
|
6.00%
|
| Tier One Risk Based Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 115,193
|
|
| Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
6.625%
|
|
| Common Equity Tier One Capital |
$ 150,960
|
$ 139,920
|
| Common Equity Tier One Capital to Risk-Weighted Assets |
8.68%
|
8.22%
|
| Common Equity Tier One Capital Required for Capital Adequacy |
$ 78,244
|
$ 76,617
|
| Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets |
4.50%
|
4.50%
|
| Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 89,111
|
|
| Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
5.125%
|
|
| Tier 1 Capital |
$ 160,964
|
$ 149,920
|
| Tier 1 Capital to Average Assets |
9.07%
|
8.63%
|
| Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes |
$ 70,985
|
$ 69,466
|
| Tier 1 Leverage Capital to Average Assets, Minimum Required for Capital Adequacy Purposes |
4.00%
|
4.00%
|
| Tier One Leverage Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 70,985
|
|
| Tier One Leverage Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
4.00%
|
|
| First Business Bank |
|
|
| Compliance with Regulatory Capital Requirements under Banking Regulations |
|
|
| Total Capital |
$ 147,811
|
$ 141,388
|
| Total Capital to Risk-Weighted Assets |
11.55%
|
11.12%
|
| Total Capital, Minimum Required for Capital Adequacy Purposes |
$ 102,362
|
$ 101,754
|
| Total Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes |
8.00%
|
8.00%
|
| Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 110,360
|
|
| Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
8.625%
|
|
| Total Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
$ 127,953
|
$ 127,193
|
| Total Capital to Risk-Weighted Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
10.00%
|
10.00%
|
| Tier 1 capital |
$ 134,208
|
$ 128,852
|
| Tier 1 Capital to Risk-Weighted Assets |
10.49%
|
10.13%
|
| Tier 1 Capital, Minimum Required for Capital Adequacy Purposes |
$ 76,772
|
$ 76,316
|
| Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes |
6.00%
|
6.00%
|
| Tier One Risk Based Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 84,769
|
|
| Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
6.625%
|
|
| Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
$ 102,362
|
$ 101,754
|
| Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
8.00%
|
8.00%
|
| Common Equity Tier One Capital |
$ 134,208
|
$ 128,852
|
| Common Equity Tier One Capital to Risk-Weighted Assets |
10.49%
|
10.13%
|
| Common Equity Tier One Capital Required for Capital Adequacy |
$ 57,579
|
$ 57,237
|
| Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets |
4.50%
|
4.50%
|
| Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 65,576
|
|
| Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
5.125%
|
|
| Common Equity Tier One Capital to be Well Capitalized |
$ 83,170
|
$ 110,669
|
| Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets |
6.50%
|
6.50%
|
| Tier 1 Capital |
$ 134,208
|
$ 128,852
|
| Tier 1 Capital to Average Assets |
10.40%
|
10.44%
|
| Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes |
$ 51,600
|
$ 49,359
|
| Tier 1 Leverage Capital to Average Assets, Minimum Required for Capital Adequacy Purposes |
4.00%
|
4.00%
|
| Tier One Leverage Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 51,600
|
|
| Tier One Leverage Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
4.00%
|
|
| Tier 1 Leverage Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
$ 64,500
|
$ 61,698
|
| Tier 1 Leverage Capital to Average Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
5.00%
|
5.00%
|
| First Business Bank – Milwaukee |
|
|
| Compliance with Regulatory Capital Requirements under Banking Regulations |
|
|
| Total Capital |
$ 24,347
|
$ 20,931
|
| Total Capital to Risk-Weighted Assets |
11.02%
|
12.03%
|
| Total Capital, Minimum Required for Capital Adequacy Purposes |
$ 17,680
|
$ 13,914
|
| Total Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes |
8.00%
|
8.00%
|
| Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 19,062
|
|
| Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
8.625%
|
|
| Total Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
$ 22,101
|
$ 17,392
|
| Total Capital to Risk-Weighted Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
10.00%
|
10.00%
|
| Tier 1 capital |
$ 22,323
|
$ 19,172
|
| Tier 1 Capital to Risk-Weighted Assets |
10.10%
|
11.02%
|
| Tier 1 Capital, Minimum Required for Capital Adequacy Purposes |
$ 13,260
|
$ 10,435
|
| Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes |
6.00%
|
6.00%
|
| Tier One Risk Based Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 14,642
|
|
| Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
6.625%
|
|
| Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
$ 17,680
|
$ 13,914
|
| Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
8.00%
|
8.00%
|
| Common Equity Tier One Capital |
$ 22,323
|
$ 19,172
|
| Common Equity Tier One Capital to Risk-Weighted Assets |
10.10%
|
11.02%
|
| Common Equity Tier One Capital Required for Capital Adequacy |
$ 9,945
|
$ 7,826
|
| Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets |
4.50%
|
4.50%
|
| Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 11,327
|
|
| Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
5.125%
|
|
| Common Equity Tier One Capital to be Well Capitalized |
$ 14,365
|
$ 82,675
|
| Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets |
6.50%
|
6.50%
|
| Tier 1 Capital |
$ 22,323
|
$ 19,172
|
| Tier 1 Capital to Average Assets |
9.15%
|
7.81%
|
| Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes |
$ 9,758
|
$ 9,821
|
| Tier 1 Leverage Capital to Average Assets, Minimum Required for Capital Adequacy Purposes |
4.00%
|
4.00%
|
| Tier One Leverage Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 9,758
|
|
| Tier One Leverage Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
4.00%
|
|
| Tier 1 Leverage Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
$ 12,198
|
$ 12,276
|
| Tier 1 Leverage Capital to Average Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
5.00%
|
5.00%
|
| Alterra Bank |
|
|
| Compliance with Regulatory Capital Requirements under Banking Regulations |
|
|
| Total Capital |
$ 31,699
|
$ 30,300
|
| Total Capital to Risk-Weighted Assets |
13.27%
|
11.39%
|
| Total Capital, Minimum Required for Capital Adequacy Purposes |
$ 19,106
|
$ 21,279
|
| Total Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes |
8.00%
|
8.00%
|
| Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 20,599
|
|
| Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
8.625%
|
|
| Total Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
$ 23,882
|
$ 26,598
|
| Total Capital to Risk-Weighted Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
10.00%
|
10.00%
|
| Tier 1 capital |
$ 28,685
|
$ 28,278
|
| Tier 1 Capital to Risk-Weighted Assets |
12.01%
|
10.63%
|
| Tier 1 Capital, Minimum Required for Capital Adequacy Purposes |
$ 14,329
|
$ 15,959
|
| Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes |
6.00%
|
6.00%
|
| Tier One Risk Based Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 15,822
|
|
| Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
6.625%
|
|
| Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
$ 19,106
|
$ 21,279
|
| Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
8.00%
|
8.00%
|
| Common Equity Tier One Capital |
$ 28,685
|
$ 28,278
|
| Common Equity Tier One Capital to Risk-Weighted Assets |
12.01%
|
10.63%
|
| Common Equity Tier One Capital Required for Capital Adequacy |
$ 10,747
|
$ 11,969
|
| Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets |
4.50%
|
4.50%
|
| Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 12,240
|
|
| Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
5.125%
|
|
| Common Equity Tier One Capital to be Well Capitalized |
$ 15,524
|
$ 11,305
|
| Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets |
6.50%
|
6.50%
|
| Tier 1 Capital |
$ 28,685
|
$ 28,278
|
| Tier 1 Capital to Average Assets |
10.58%
|
9.89%
|
| Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes |
$ 10,842
|
$ 11,441
|
| Tier 1 Leverage Capital to Average Assets, Minimum Required for Capital Adequacy Purposes |
4.00%
|
4.00%
|
| Tier One Leverage Capital Required for Capital Adequacy Plus Capital Conservation Buffer |
$ 10,842
|
|
| Tier One Leverage Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets |
4.00%
|
|
| Tier 1 Leverage Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
$ 13,552
|
$ 14,301
|
| Tier 1 Leverage Capital to Average Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements |
5.00%
|
5.00%
|