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Regulatory Capital (Regulatory Capital Ratios) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital (to risk-weighted assets) $ 209,791 $ 204,117
Total capital to risk-weighted assets 11.91% 11.74%
Total capital, Minimum Required for Capital Adequacy Purposes $ 140,904 $ 139,101
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 $ 162,921 $ 149,968
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 9.25% 8.625%
Tier 1 capital (to risk-weighted assets) $ 164,404 $ 160,964
Tier 1 capital to risk-weighted assets 9.33% 9.26%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 105,678 $ 104,326
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 $ 127,694 $ 115,193
Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.25% 6.625%
Common equity tier 1 capital $ 154,392 $ 150,960
Common equity tier 1 capital to risk-weighted assets 8.77% 8.68%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 79,259 $ 78,244
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 101,275 $ 89,111
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 5.75% 5.125%
Tier 1 leverage capital (to adjusted assets) $ 164,404 $ 160,964
Tier 1 leverage capital to average assets 9.28% 9.07%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 70,899 $ 70,985
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 $ 70,899 $ 70,985
Tier One Leverage Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 4.00% 4.00%
First Business Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital (to risk-weighted assets) $ 207,707 $ 147,811
Total capital to risk-weighted assets 11.83% 11.55%
Total capital, Minimum Required for Capital Adequacy Purposes $ 140,476 $ 102,362
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 $ 162,426 $ 110,360
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 9.25% 8.625%
Total capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 175,596 $ 127,953
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 186,030 $ 134,208
Tier 1 capital to risk-weighted assets 10.59% 10.49%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 105,357 $ 76,772
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 $ 127,307 $ 84,769
Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.25% 6.625%
Tier 1 capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 140,476 $ 102,362
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 8.00% 8.00%
Common equity tier 1 capital $ 186,030 $ 134,208
Common equity tier 1 capital to risk-weighted assets 10.59% 10.49%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 79,018 $ 57,579
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 100,967 $ 65,576
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 5.75% 5.125%
Common equity tier 1 capital, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements $ 114,137 $ 83,170
Common equity tier 1 capital to risk-weighted assets, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements 6.50% 6.50%
Tier 1 leverage capital (to adjusted assets) $ 186,030 $ 134,208
Tier 1 leverage capital to average assets 10.52% 10.40%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 70,714 $ 51,600
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 $ 70,714 $ 51,600
Tier One Leverage Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 4.00% 4.00%
Tier 1 leverage capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 88,393 $ 64,500
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 (to risk-weighted assets)   $ 24,347
Total capital to risk-weighted assets   11.02%
Total capital, Minimum Required for Capital Adequacy Purposes   $ 17,680
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes   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
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements   10.00%
Tier 1 capital (to risk-weighted assets)   $ 22,323
Tier 1 capital to risk-weighted assets   10.10%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes   $ 13,260
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes   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
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements   8.00%
Common equity tier 1 capital   $ 22,323
Common equity tier 1 capital to risk-weighted assets   10.10%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes   $ 9,945
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes   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 1 capital, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements   $ 14,365
Common equity tier 1 capital to risk-weighted assets, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements   6.50%
Tier 1 leverage capital (to adjusted assets)   $ 22,323
Tier 1 leverage capital to average assets   9.15%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes   $ 9,758
Tier 1 leverage capital to average assets, Minimum Required for Capital Adequacy Purposes   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
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements   5.00%
Alterra Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital (to risk-weighted assets)   $ 31,699
Total capital to risk-weighted assets   13.27%
Total capital, Minimum Required for Capital Adequacy Purposes   $ 19,106
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes   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
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements   10.00%
Tier 1 capital (to risk-weighted assets)   $ 28,685
Tier 1 capital to risk-weighted assets   12.01%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes   $ 14,329
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes   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
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements   8.00%
Common equity tier 1 capital   $ 28,685
Common equity tier 1 capital to risk-weighted assets   12.01%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes   $ 10,747
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes   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 1 capital, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements   $ 15,524
Common equity tier 1 capital to risk-weighted assets, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements   6.50%
Tier 1 leverage capital (to adjusted assets)   $ 28,685
Tier 1 leverage capital to average assets   10.58%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes   $ 10,842
Tier 1 leverage capital to average assets, Minimum Required for Capital Adequacy Purposes   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
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements   5.00%