Regulatory Capital (Tables)

3 Months Ended

Mar. 31, 2016

Regulatory Capital Requirements [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

The following table summarizes the Corporation’s and Banks’ capital ratios and the ratios required by their federal regulators at March 31, 2016 and December 31, 2015, respectively:



	Actual				Minimum Required for Capital Adequacy Purposes				Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(Dollars in Thousands)
As of March 31, 2016
Total capital
(to risk-weighted assets)
Consolidated	$	192,670	11.24	%	$	137,131	8.00	%	N/A		N/A
First Business Bank	145,732		11.43		102,002		8.00		$	127,502	10.00	%
First Business Bank — Milwaukee	21,170		11.74		14,425		8.00		18,032		10.00
Alterra Bank	31,464		12.37		20,345		8.00		25,432		10.00
Tier 1 capital
(to risk-weighted assets)
Consolidated	$	153,531	8.96	%	$	102,848	6.00	%	N/A		N/A
First Business Bank	132,943		10.43		76,501		6.00		$	102,002	8.00	%
First Business Bank — Milwaukee	19,350		10.73		10,819		6.00		14,425		8.00
Alterra Bank	29,390		11.56		15,259		6.00		20,345		8.00
Common equity tier 1 capital
(to risk-weighted assets)
Consolidated	$	143,531	8.37	%	$	77,136	4.50	%	N/A		N/A
First Business Bank	132,943		10.43		57,376		4.50		$	82,877	6.50	%
First Business Bank — Milwaukee	19,350		10.73		8,114		4.50		11,721		6.50
Alterra Bank	29,390		11.56		11,444		4.50		16,530		6.50
Tier 1 capital
(to average assets)
Consolidated	$	153,531	8.44	%	$	72,805	4.00	%	N/A		N/A
First Business Bank	132,943		10.30		51,647		4.00		$	64,559	5.00	%
First Business Bank — Milwaukee	19,350		7.38		10,485		4.00		13,106		5.00
Alterra Bank	29,390		9.45		12,440		4.00		15,551		5.00



	Actual				Minimum Required for Capital Adequacy Purposes				Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements
	Amount		Ratio		Amount		Ratio		Amount		Ratio
	(Dollars in Thousands)
As of December 31, 2015
Total capital
(to risk-weighted assets)
Consolidated	$	189,163	11.11	%	$	136,208	8.00	%	N/A		N/A
First Business Bank	141,388		11.12		101,754		8.00		$	127,193	10.00	%
First Business Bank — Milwaukee	20,931		12.03		13,914		8.00		17,392		10.00
Alterra Bank	30,300		11.39		21,279		8.00		26,598		10.00
Tier 1 capital
(to risk-weighted assets)
Consolidated	$	149,920	8.81		$	102,156	6.00	%	N/A		N/A
First Business Bank	128,852		10.13		76,316		6.00		$	101,754	8.00	%
First Business Bank — Milwaukee	19,172		11.02		10,435		6.00		13,914		8.00
Alterra Bank	28,278		10.63		15,959		6.00		21,279		8.00
Common equity tier 1 capital
(to risk-weighted assets)
Consolidated	$	139,920	8.22		$	76,617	4.50	%	N/A		N/A
First Business Bank	128,852		10.13		57,237		4.50		$	110,669	6.50	%
First Business Bank — Milwaukee	19,172		11.02		7,826		4.50		82,675		6.50
Alterra Bank	28,278		10.63		11,969		4.50		11,305		6.50
Tier 1 capital
(to average assets)
Consolidated	$	149,920	8.63		$	69,466	4.00	%	N/A		N/A
First Business Bank	128,852		10.44		49,359		4.00		$	61,698	5.00	%
First Business Bank — Milwaukee	19,172		7.81		9,821		4.00		12,276		5.00
Alterra Bank	28,278		9.89		11,441		4.00		14,301		5.00