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Stockholders' Equity and Regulatory Capital (Regulatory Capital Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total Capital $ 214,501 $ 204,117
Total Capital to Risk-Weighted Assets 11.98% 11.74%
Total Capital, Minimum Required for Capital Adequacy Purposes $ 143,219 $ 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 $ 165,597 $ 149,968
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 9.25% 8.625%
Tier 1 capital $ 169,176 $ 160,964
Tier 1 Capital to Risk-Weighted Assets 9.45% 9.26%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 107,414 $ 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 $ 129,792 $ 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 One Capital $ 159,157 $ 150,960
Common Equity Tier One Capital to Risk-Weighted Assets 8.89% 8.68%
Common Equity Tier One Capital Required for Capital Adequacy $ 80,561 $ 78,244
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 $ 102,939 $ 89,111
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 5.75% 5.125%
Tier 1 Capital $ 169,176 $ 160,964
Tier 1 Capital to Average Assets 9.54% 9.07%
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 70,920 $ 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 $ 70,920 $ 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 $ 207,986 $ 147,811
Total Capital to Risk-Weighted Assets 11.66% 11.55%
Total Capital, Minimum Required for Capital Adequacy Purposes $ 142,736 $ 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 $ 165,038 $ 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 $ 178,420 $ 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 $ 186,374 $ 134,208
Tier 1 Capital to Risk-Weighted Assets 10.45% 10.49%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 107,052 $ 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 $ 129,354 $ 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 $ 142,736 $ 102,362
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 8.00% 8.00%
Common Equity Tier One Capital $ 186,374 $ 134,208
Common Equity Tier One Capital to Risk-Weighted Assets 10.45% 10.49%
Common Equity Tier One Capital Required for Capital Adequacy $ 80,289 $ 57,579
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 $ 102,591 $ 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 One Capital to be Well Capitalized $ 115,973 $ 83,170
Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets 6.50% 6.50%
Tier 1 Capital $ 186,374 $ 134,208
Tier 1 Capital to Average Assets 10.56% 10.40%
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 70,617 $ 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 $ 70,617 $ 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 $ 88,272 $ 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   $ 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   $ 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, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements   8.00%
Common Equity Tier One Capital   $ 22,323
Common Equity Tier One Capital to Risk-Weighted Assets   10.10%
Common Equity Tier One Capital Required for Capital Adequacy   $ 9,945
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets   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
Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets   6.50%
Tier 1 Capital   $ 22,323
Tier 1 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   $ 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   $ 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, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements   8.00%
Common Equity Tier One Capital   $ 28,685
Common Equity Tier One Capital to Risk-Weighted Assets   12.01%
Common Equity Tier One Capital Required for Capital Adequacy   $ 10,747
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets   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
Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets   6.50%
Tier 1 Capital   $ 28,685
Tier 1 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%