Regulatory Capital (Tables)

9 Months Ended

Sep. 30, 2016

Regulatory Capital Requirements [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations

The following table summarizes both the Corporation’s and Banks’ capital ratios and the ratios required by their federal regulators at September 30, 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 September 30, 2016
Total capital
(to risk-weighted assets)
Consolidated	$	200,175	11.44	%	$	139,979	8.00	%	N/A		N/A
First Business Bank	144,931		11.42		101,529		8.00		$	126,912	10.00	%
First Business Bank — Milwaukee	23,437		11.12		16,868		8.00		21,085		10.00
Alterra Bank	30,705		11.57		21,225		8.00		26,531		10.00
Tier 1 capital
(to risk-weighted assets)
Consolidated	$	157,876	9.02	%	$	104,984	6.00	%	N/A		N/A
First Business Bank	131,964		10.40		76,147		6.00		$	101,529	8.00	%
First Business Bank — Milwaukee	21,357		10.13		12,651		6.00		16,868		8.00
Alterra Bank	27,368		10.32		15,918		6.00		21,225		8.00
Common Equity Tier 1 capital
(to risk-weighted assets)
Consolidated	$	147,876	8.45	%	$	78,738	4.50	%	N/A		N/A
First Business Bank	131,964		10.40		57,110		4.50		$	82,493	6.50	%
First Business Bank — Milwaukee	21,357		10.13		9,488		4.50		13,705		6.50
Alterra Bank	27,368		10.32		11,939		4.50		17,245		6.50
Tier 1 leverage capital
(to adjusted assets)
Consolidated	$	157,876	8.75	%	$	72,204	4.00	%	N/A		N/A
First Business Bank	131,964		10.34		51,065		4.00		$	63,831	5.00	%
First Business Bank — Milwaukee	21,357		7.62		11,205		4.00		14,006		5.00
Alterra Bank	27,368		9.60		11,400		4.00		14,250		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 leverage capital
(to adjusted 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