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Regulatory Capital (Regulatory Capital Ratios) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations
Total capital	$ 184,772	$ 173,263
Total capital to risk-weighted assets	11.29%	12.13%
Total capital, Minimum Required for Capital Adequacy Purposes	$ 130,895	$ 114,253
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	8.00%	8.00%
Tier 1 capital	$ 146,487	$ 136,008
Tier 1 capital to risk-weighted assets	8.95%	9.52%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes	$ 98,171	$ 57,127
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	6.00%	4.00%
Common equity tier 1 capital	$ 136,487
Common equity tier 1 capital to risk-weighted assets	8.34%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes	$ 73,628
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	4.50%
Tier 1 capital	$ 146,487	$ 136,008
Tier 1 leverage capital to average assets	8.59%	8.71%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes	$ 5,459	$ 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	$ 139,794	$ 131,411
Total capital to risk-weighted assets	11.54%	12.19%
Total capital, Minimum Required for Capital Adequacy Purposes	$ 96,892	$ 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	$ 121,115	$ 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	$ 127,808	$ 118,907
Tier 1 capital to risk-weighted assets	10.55%	11.03%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes	$ 72,669	$ 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	$ 96,892	$ 64,704
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	8.00%	6.00%
Common equity tier 1 capital	$ 127,808
Common equity tier 1 capital to risk-weighted assets	10.55%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes	$ 54,502
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	4.50%
Common equity tier 1 capital, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements	$ 106,352
Common equity tier 1 capital to risk-weighted assets, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements	6.50%
Tier 1 capital	$ 127,808	$ 118,907
Tier 1 leverage capital to average assets	10.60%	10.13%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes	$ 5,112	$ 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	$ 6,390	$ 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	$ 20,690	$ 19,128
Total capital to risk-weighted assets	12.74%	12.47%
Total capital, Minimum Required for Capital Adequacy Purposes	$ 12,989	$ 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	$ 16,236	$ 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	$ 18,984	$ 17,641
Tier 1 capital to risk-weighted assets	11.69%	11.50%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes	$ 9,742	$ 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	$ 12,989	$ 9,206
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	8.00%	6.00%
Common equity tier 1 capital	$ 18,984
Common equity tier 1 capital to risk-weighted assets	11.69%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes	$ 7,306
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	4.50%
Common equity tier 1 capital, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements	$ 78,725
Common equity tier 1 capital to risk-weighted assets, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements	6.50%
Tier 1 capital	$ 18,984	$ 17,641
Tier 1 leverage capital to average assets	7.78%	7.90%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes	$ 759	$ 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	$ 949	$ 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	$ 29,115	$ 22,657
Total capital to risk-weighted assets	11.02%	10.90%
Total capital, Minimum Required for Capital Adequacy Purposes	$ 21,127	$ 16,628
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	$ 26,409	$ 20,785
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	10.00%	10.00%
Tier 1 capital	$ 27,448	$ 22,320
Tier 1 capital to risk-weighted assets	10.39%	10.74%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes	$ 15,845	$ 8,314
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	$ 21,127	$ 12,471
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	8.00%	6.00%
Common equity tier 1 capital	$ 27,448
Common equity tier 1 capital to risk-weighted assets	10.39%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes	$ 11,884
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	4.50%
Common equity tier 1 capital, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements	$ 10,554
Common equity tier 1 capital to risk-weighted assets, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements	6.50%
Tier 1 capital	$ 27,448	$ 22,320
Tier 1 leverage capital to average assets	9.90%	9.01%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes	$ 1,098	$ 9,910
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	$ 1,372	$ 12,388
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	5.00%	5.00%

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