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Regulatory Capital (Tables)
 3 Months Ended
Mar. 31, 2018
Regulatory Capital Requirements [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
The following table summarizes both the Corporation’s and Bank’s capital ratios and the ratios required by their federal regulators at March 31, 2018 and December 31, 2017:

 
 
Actual
 
Minimum Required for Capital Adequacy Purposes
 
For Capital Adequacy Purposes Plus Capital Conservation Buffer
 
Minimum Required to Be Well
Capitalized Under Prompt Corrective Action Requirements
 
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
 
(Dollars in Thousands)
As of March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total capital
(to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
$
216,519

 
11.78
%
 
$
147,099

 
8.00
%
 
$
181,575

 
9.875
%
 
N/A

 
N/A

First Business Bank
 
209,579

 
11.45

 
146,437

 
8.00

 
180,758

 
9.875

 
$
183,046

 
10.00
%
Tier 1 capital
(to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
$
171,638

 
9.33
%
 
$
110,324

 
6.00
%
 
$
144,801

 
7.875
%
 
N/A

 
N/A

First Business Bank
 
188,425

 
10.29

 
109,828

 
6.00

 
144,149

 
7.875

 
$
146,437

 
8.00
%
Common equity tier 1 capital
(to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
$
161,616

 
8.79
%
 
$
82,743

 
4.50
%
 
$
117,219

 
6.375
%
 
N/A

 
N/A

First Business Bank
 
188,425

 
10.29

 
82,371

 
4.50

 
116,692

 
6.375

 
$
118,980

 
6.50
%
Tier 1 leverage capital
(to adjusted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
$
171,638

 
9.26
%
 
$
74,127

 
4.00
%
 
$
74,127

 
4.00
%
 
N/A

 
N/A

First Business Bank
 
188,425

 
10.19

 
73,929

 
4.00

 
73,929

 
4.00

 
$
92,412

 
5.00
%
 
 
Actual
 
Minimum Required for Capital Adequacy Purposes
 
For Capital Adequacy Purposes Plus Capital Conservation Buffer
 
Minimum Required to Be Well
Capitalized Under Prompt Corrective Action Requirements
 
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
 
(Dollars in Thousands)
As of December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total capital
(to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
$
214,501

 
11.98
%
 
$
143,219

 
8.00
%
 
$
165,597

 
9.250
%
 
N/A

 
N/A

First Business Bank
 
207,986

 
11.66

 
142,736

 
8.00

 
165,038

 
9.250

 
$
178,420

 
10.00
%
Tier 1 capital
(to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
$
169,176

 
9.45
%
 
$
107,414

 
6.00
%
 
$
129,792

 
7.250
%
 
N/A

 
N/A

First Business Bank
 
186,374

 
10.45

 
107,052

 
6.00

 
129,354

 
7.250

 
$
142,736

 
8.00
%
Common equity tier 1 capital
(to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
$
159,157

 
8.89
%
 
$
80,561

 
4.50
%
 
$
102,939

 
5.750
%
 
N/A

 
N/A

First Business Bank
 
186,374

 
10.45

 
80,289

 
4.50

 
102,591

 
5.750

 
$
115,973

 
6.50
%
Tier 1 leverage capital
(to adjusted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Consolidated
 
$
169,176

 
9.54
%
 
$
70,920

 
4.00
%
 
$
70,920

 
4.00
%
 
N/A

 
N/A

First Business Bank
 
186,374

 
10.56

 
70,617

 
4.00

 
70,617

 
4.00

 
$
88,272

 
5.00
%