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Regulatory Capital (Tables)
6 Months Ended
Jun. 30, 2022
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations The following tables summarize both the Corporation’s and the Bank’s capital ratios and the ratios required by their federal regulators:
As of June 30, 2022
ActualMinimum Required for Capital Adequacy PurposesFor Capital Adequacy Purposes Plus Capital Conservation BufferMinimum Required to Be Well
Capitalized Under Prompt Corrective Action Requirements
 AmountRatioAmountRatioAmountRatioAmountRatio
 (Dollars in Thousands)
Total capital
(to risk-weighted assets)
Consolidated$309,573 11.56 %$214,312 8.00 %$281,285 10.50 %N/AN/A
First Business Bank301,151 11.25 214,190 8.00 281,125 10.50 $267,738 10.00 %
Tier 1 capital
(to risk-weighted assets)
Consolidated$250,331 9.34 %$160,734 6.00 %$227,707 8.50 %N/AN/A
First Business Bank276,184 10.32 160,643 6.00 227,577 8.50 $214,190 8.00 %
Common equity tier 1 capital
(to risk-weighted assets)
Consolidated$238,339 8.90 %$120,551 4.50 %$187,523 7.00 %N/AN/A
First Business Bank276,184 10.32 120,482 4.50 187,417 7.00 $174,030 6.50 %
Tier 1 leverage capital
(to adjusted assets)
Consolidated$250,331 9.19 %$108,923 4.00 %$108,923 4.00 %N/AN/A
First Business Bank276,184 10.15 108,823 4.00 108,823 4.00 $136,029 5.00 %
As of December 31, 2021
 ActualMinimum Required for Capital Adequacy PurposesFor Capital Adequacy Purposes Plus Capital Conservation BufferMinimum Required to Be Well
Capitalized Under Prompt Corrective Action Requirements
 AmountRatioAmountRatioAmountRatioAmountRatio
 (Dollars in Thousands)
Total capital
(to risk-weighted assets)
      
Consolidated$281,745 10.82 %$208,337 8.00 %$273,443 10.50 %N/AN/A
First Business Bank280,448 10.78 208,142 8.00 273,187 10.50 $260,178 10.00 %
Tier 1 capital
(to risk-weighted assets)
Consolidated$232,795 8.94 %$156,253 6.00 %$221,358 8.50 %N/AN/A
First Business Bank255,286 9.81 156,107 6.00 221,151 8.50 $208,142 8.00 %
Common equity tier 1 capital
(to risk-weighted assets)
Consolidated$222,719 8.55 %$117,190 4.50 %$182,295 7.00 %N/AN/A
First Business Bank255,286 9.81 117,080 4.50 182,124 7.00 $169,116 6.50 %
Tier 1 leverage capital
(to adjusted assets)
Consolidated$232,795 8.94 %$104,145 4.00 %$104,145 4.00 %N/AN/A
First Business Bank255,286 9.81 104,045 4.00 104,045 4.00 $130,056 5.00 %