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Regulatory Capital (Regulatory Capital Ratios) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital (to risk-weighted assets) $ 206,010 $ 204,117
Total capital to risk-weighted assets 11.55% 11.74%
Total capital, Minimum Required for Capital Adequacy Purposes $ 142,712 $ 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 $ 165,011 $ 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) $ 163,413 $ 160,964
Tier 1 capital to risk-weighted assets 9.16% 9.26%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 107,034 $ 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 $ 129,333 $ 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 $ 153,405 $ 150,960
Common equity tier 1 capital to risk-weighted assets 8.60% 8.68%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 80,276 $ 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 $ 102,574 $ 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) $ 163,413 $ 160,964
Tier 1 leverage capital to average assets 9.26% 9.07%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 70,575 $ 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 $ 70,575 $ 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) $ 148,557 $ 147,811
Total capital to risk-weighted assets 11.35% 11.55%
Total capital, Minimum Required for Capital Adequacy Purposes $ 104,691 $ 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 $ 121,049 $ 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 $ 130,863 $ 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) $ 134,629 $ 134,208
Tier 1 capital to risk-weighted assets 10.29% 10.49%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 78,518 $ 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 $ 94,876 $ 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 $ 104,691 $ 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 $ 134,629 $ 134,208
Common equity tier 1 capital to risk-weighted assets 10.29% 10.49%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 58,888 $ 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 $ 75,246 $ 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 $ 85,061 $ 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) $ 134,629 $ 134,208
Tier 1 leverage capital to average assets 10.38% 10.40%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 51,862 $ 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 $ 51,862 $ 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 $ 64,827 $ 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) $ 24,865 $ 24,347
Total capital to risk-weighted assets 10.51% 11.02%
Total capital, Minimum Required for Capital Adequacy Purposes $ 18,920 $ 17,680
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 $ 21,876 $ 19,062
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 $ 23,650 $ 22,101
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) $ 22,787 $ 22,323
Tier 1 capital to risk-weighted assets 9.64% 10.10%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 14,190 $ 13,260
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 $ 17,146 $ 14,642
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 $ 18,920 $ 17,680
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 $ 22,787 $ 22,323
Common equity tier 1 capital to risk-weighted assets 9.64% 10.10%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 10,642 $ 9,945
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 $ 13,599 $ 11,327
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 $ 15,372 $ 14,365
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) $ 22,787 $ 22,323
Tier 1 leverage capital to average assets 8.93% 9.15%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 10,206 $ 9,758
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 $ 10,206 $ 9,758
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 $ 12,757 $ 12,198
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 (to risk-weighted assets) $ 31,562 $ 31,699
Total capital to risk-weighted assets 13.23% 13.27%
Total capital, Minimum Required for Capital Adequacy Purposes $ 19,079 $ 19,106
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 $ 22,060 $ 20,599
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 $ 23,849 $ 23,882
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) $ 28,548 $ 28,685
Tier 1 capital to risk-weighted assets 11.97% 12.01%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 14,309 $ 14,329
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 $ 17,290 $ 15,822
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 $ 19,079 $ 19,106
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 $ 28,548 $ 28,685
Common equity tier 1 capital to risk-weighted assets 11.97% 12.01%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 10,732 $ 10,747
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 $ 13,713 $ 12,240
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 $ 15,502 $ 15,524
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) $ 28,548 $ 28,685
Tier 1 leverage capital to average assets 11.55% 10.58%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 9,888 $ 10,842
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 $ 9,888 $ 10,842
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 $ 12,360 $ 13,552
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 5.00% 5.00%