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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%