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Regulatory Capital (Regulatory Capital Ratios) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations
Total capital	$ 164,341	$ 145,352
Total capital to risk-weighted assets	13.97%	13.16%
Total capital, Minimum Required for Capital Adequacy Purposes	94,081	88,373
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	8.00%	8.00%
Tier 1 capital	127,485	119,617
Tier 1 Capital to Risk-Weighted Assets	10.84%	10.83%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes	47,040	44,186
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	4.00%	4.00%
Tier 1 capital	127,485	119,617
Tier 1 leverage capital to average assets	9.56%	9.35%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes	53,325	51,153
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	128,629	123,331
Total capital to risk-weighted assets	12.30%	12.57%
Total capital, Minimum Required for Capital Adequacy Purposes	83,672	78,516
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	104,590	98,145
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	10.00%	10.00%
Tier 1 capital	116,289	111,062
Tier 1 Capital to Risk-Weighted Assets	11.12%	11.32%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes	41,836	39,258
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	4.00%	4.00%
Tier 1 capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	62,754	58,887
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	6.00%	6.00%
Tier 1 capital	116,289	111,062
Tier 1 leverage capital to average assets	10.43%	10.35%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes	44,589	42,913
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	55,737	53,641
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	18,879	17,944
Total capital to risk-weighted assets	14.58%	14.66%
Total capital, Minimum Required for Capital Adequacy Purposes	10,360	9,790
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	12,950	12,238
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	10.00%	10.00%
Tier 1 capital	17,289	16,414
Tier 1 Capital to Risk-Weighted Assets	13.35%	13.41%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes	5,180	4,895
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes	4.00%	4.00%
Tier 1 capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	7,770	7,343
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements	6.00%	6.00%
Tier 1 capital	17,289	16,414
Tier 1 leverage capital to average assets	7.64%	7.64%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes	9,058	8,595
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	$ 11,322	$ 10,744
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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The amount of total capital as defined in the regulations.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Risk Based Capital as defined in the regulations.

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