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Stockholders' Equity and Regulatory Capital (Regulatory Capital Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total Capital $ 189,163 $ 173,263
Total Capital to Risk-Weighted Assets 11.11% 12.13%
Total Capital, Minimum Required for Capital Adequacy Purposes $ 136,208 $ 114,253
Total Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes 8.00% 8.00%
Tier 1 capital $ 149,920 $ 136,008
Tier 1 Capital to Risk-Weighted Assets 8.81% 9.52%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 102,156 $ 57,127
Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes 6.00% 4.00%
Common Equity Tier One Capital $ 139,920  
Common Equity Tier One Capital to Risk-Weighted Assets 8.22%  
Common Equity Tier One Capital Required for Capital Adequacy $ 76,617  
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50%  
Tier 1 Capital $ 149,920 $ 136,008
Tier 1 Capital to Average Assets 8.63% 8.71%
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 69,466 $ 62,490
Tier 1 Leverage Capital to Average Assets, Minimum Required for Capital Adequacy Purposes 4.00% 4.00%
First Business Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total Capital $ 141,388 $ 131,411
Total Capital to Risk-Weighted Assets 11.12% 12.19%
Total Capital, Minimum Required for Capital Adequacy Purposes $ 101,754 $ 86,272
Total Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes 8.00% 8.00%
Total Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 127,193 $ 107,841
Total Capital to Risk-Weighted Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 10.00% 10.00%
Tier 1 capital $ 128,852 $ 118,907
Tier 1 Capital to Risk-Weighted Assets 10.13% 11.03%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 76,316 $ 43,136
Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes 6.00% 4.00%
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 101,754 $ 64,704
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 8.00% 6.00%
Common Equity Tier One Capital $ 128,852  
Common Equity Tier One Capital to Risk-Weighted Assets 10.13%  
Common Equity Tier One Capital Required for Capital Adequacy $ 57,237  
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50%  
Common Equity Tier One Capital to be Well Capitalized $ 110,669  
Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets 6.50%  
Tier 1 Capital $ 128,852 $ 118,907
Tier 1 Capital to Average Assets 10.44% 10.13%
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 49,359 $ 46,960
Tier 1 Leverage Capital to Average Assets, Minimum Required for Capital Adequacy Purposes 4.00% 4.00%
Tier 1 Leverage Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 61,698 $ 58,700
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 $ 20,931 $ 19,128
Total Capital to Risk-Weighted Assets 12.03% 12.47%
Total Capital, Minimum Required for Capital Adequacy Purposes $ 13,914 $ 12,274
Total Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes 8.00% 8.00%
Total Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 17,392 $ 15,343
Total Capital to Risk-Weighted Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 10.00% 10.00%
Tier 1 capital $ 19,172 $ 17,641
Tier 1 Capital to Risk-Weighted Assets 11.02% 11.50%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 10,435 $ 6,137
Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes 6.00% 4.00%
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 13,914 $ 9,206
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 8.00% 6.00%
Common Equity Tier One Capital $ 19,172  
Common Equity Tier One Capital to Risk-Weighted Assets 11.02%  
Common Equity Tier One Capital Required for Capital Adequacy $ 7,826  
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50%  
Common Equity Tier One Capital to be Well Capitalized $ 82,675  
Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets 6.50%  
Tier 1 Capital $ 19,172 $ 17,641
Tier 1 Capital to Average Assets 7.81% 7.90%
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 9,821 $ 8,935
Tier 1 Leverage Capital to Average Assets, Minimum Required for Capital Adequacy Purposes 4.00% 4.00%
Tier 1 Leverage Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 12,276 $ 11,169
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 $ 30,300  
Total Capital to Risk-Weighted Assets 11.39%  
Total Capital, Minimum Required for Capital Adequacy Purposes $ 21,279  
Total Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes 8.00%  
Total Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 26,598  
Total Capital to Risk-Weighted Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 10.00%  
Tier 1 capital $ 28,278  
Tier 1 Capital to Risk-Weighted Assets 10.63%  
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 15,959  
Tier 1 Capital to Risk-Weighted Assets, Minimum Required for Capital Adequacy Purposes 6.00%  
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 21,279  
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 8.00%  
Common Equity Tier One Capital $ 28,278  
Common Equity Tier One Capital to Risk-Weighted Assets 10.63%  
Common Equity Tier One Capital Required for Capital Adequacy $ 11,969  
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50%  
Common Equity Tier One Capital to be Well Capitalized $ 11,305  
Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets 6.50%  
Tier 1 Capital $ 28,278  
Tier 1 Capital to Average Assets 9.89%  
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 11,441  
Tier 1 Leverage Capital to Average Assets, Minimum Required for Capital Adequacy Purposes 4.00%  
Tier 1 Leverage Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 14,301  
Tier 1 Leverage Capital to Average Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 5.00%