Regulatory Capital (Tables)

9 Months Ended

Sep. 30, 2015

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 September 30, 2015 and December 31, 2014, 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 September 30, 2015
Total capital
(to risk-weighted assets)
Consolidated	$	184,772	11.29	%	$	130,895	8.00	%	N/A		N/A
First Business Bank	139,794		11.54		96,892		8.00		$	121,115	10.00	%
First Business Bank — Milwaukee	20,690		12.74		12,989		8.00		16,236		10.00
Alterra Bank	29,115		11.02		21,127		8.00		26,409		10.00
Tier 1 capital
(to risk-weighted assets)
Consolidated	$	146,487	8.95	%	$	98,171	6.00	%	N/A		N/A
First Business Bank	127,808		10.55		72,669		6.00		$	96,892	8.00	%
First Business Bank — Milwaukee	18,984		11.69		9,742		6.00		12,989		8.00
Alterra Bank	27,448		10.39		15,845		6.00		21,127		8.00
Common equity tier 1 capital
(to risk-weighted assets)
Consolidated	$	136,487	8.34	%	$	73,628	4.50	%	N/A		N/A
First Business Bank	127,808		10.55		54,502		4.50		$	106,352	6.50	%
First Business Bank — Milwaukee	18,984		11.69		7,306		4.50		78,725		6.50
Alterra Bank	27,448		10.39		11,884		4.50		10,554		6.50
Tier 1 capital
(to average assets)
Consolidated	$	146,487	8.59	%	$	5,459	4.00	%	N/A		N/A
First Business Bank	127,808		10.60		5,112		4.00		$	6,390	5.00	%
First Business Bank — Milwaukee	18,984		7.78		759		4.00		949		5.00
Alterra Bank	27,448		9.90		1,098		4.00		1,372		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, 2014
Total capital
(to risk-weighted assets)
Consolidated	$	173,263	12.13	%	$	114,253	8.00	%	N/A		N/A
First Business Bank	131,411		12.19		86,272		8.00		$	107,841	10.00	%
First Business Bank — Milwaukee	19,128		12.47		12,274		8.00		15,343		10.00
Alterra Bank	22,657		10.90		16,628		8.00		20,785		10.00
Tier 1 capital
(to risk-weighted assets)
Consolidated	$	136,008	9.52		$	57,127	4.00	%	N/A		N/A
First Business Bank	118,907		11.03		43,136		4.00		$	64,704	6.00	%
First Business Bank — Milwaukee	17,641		11.50		6,137		4.00		9,206		6.00
Alterra Bank	22,320		10.74		8,314		4.00		12,471		6.00
Tier 1 capital
(to average assets)
Consolidated	$	136,008	8.71		$	62,490	4.00	%	N/A		N/A
First Business Bank	118,907		10.13		46,960		4.00		$	58,700	5.00	%
First Business Bank — Milwaukee	17,641		7.90		8,935		4.00		11,169		5.00
Alterra Bank	22,320		9.01		9,910		4.00		12,388		5.00