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Regulatory Capital (Regulatory Capital Ratios) (Details)
$ in Thousands
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 331,220 $ 323,893
Total capital to risk-weighted assets 0.1104 0.1126
Total capital, Minimum Required for Capital Adequacy Purposes $ 240,008 $ 230,180
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 0.0800 0.0800
Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 315,011 $ 302,111
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 270,197 $ 264,843
Tier 1 capital to risk-weighted assets 0.0901 0.0920
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 180,006 $ 172,635
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 0.0600 0.0600
Tier One Risk Based Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 255,009 $ 244,566
Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 8.50% 8.50%
Common equity tier 1 capital $ 258,205 $ 252,851
Common equity tier 1 capital to risk-weighted assets 8.61% 8.79%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 135,005 $ 129,476
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 210,007 $ 201,407
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 7.00%
Tier 1 leverage capital $ 270,197 $ 264,843
Tier 1 leverage capital to average assets 0.0900 0.0917
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 120,047 $ 115,464
Tier 1 leverage capital to average assets, Minimum Required for Capital Adequacy Purposes 0.0400 0.0400
Tier One Leverage Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 120,047 $ 115,464
Tier One Leverage Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 4.00% 4.00%
First Business Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 331,500 $ 323,021
Total capital to risk-weighted assets 0.1105 0.1122
Total capital, Minimum Required for Capital Adequacy Purposes $ 239,963 $ 230,367
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 0.0800 0.0800
Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 314,951 $ 302,357
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Total capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 299,954 $ 287,959
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.1000 0.1000
Tier 1 capital $ 304,851 $ 298,312
Tier 1 capital to risk-weighted assets 0.1016 0.1036
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 179,972 $ 172,775
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 0.0600 0.0600
Tier One Risk Based Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 254,961 $ 244,765
Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 8.50% 8.50%
Tier 1 capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 239,963 $ 230,367
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0800 0.0800
Common equity tier 1 capital $ 304,851 $ 298,312
Common equity tier 1 capital to risk-weighted assets 10.16% 10.36%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 134,979 $ 129,581
Common equity tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 209,968 $ 201,571
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 7.00%
Common equity tier 1 capital, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements $ 194,970 $ 187,173
Common equity tier 1 capital to risk-weighted assets, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements 6.50% 6.50%
Tier 1 leverage capital $ 304,851 $ 298,312
Tier 1 leverage capital to average assets 0.1016 0.1034
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 120,026 $ 115,402
Tier 1 leverage capital to average assets, Minimum Required for Capital Adequacy Purposes 0.0400 0.0400
Tier One Leverage Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 120,026 $ 115,402
Tier One Leverage Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 4.00% 4.00%
Tier 1 leverage capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 150,033 $ 144,252
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0500 0.0500