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Regulatory Capital (Regulatory Capital Ratios) (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 384,083 $ 375,440
Total capital to risk-weighted assets 0.1136 0.1119
Total capital, Minimum Required for Capital Adequacy Purposes $ 270,485 $ 268,500
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 $ 355,011 $ 352,406
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 299,707 $ 293,338
Tier 1 capital to risk-weighted assets 0.0886 0.0874
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 202,864 $ 201,375
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 $ 287,390 $ 285,281
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 $ 287,715 $ 281,346
Common equity tier 1 capital to risk-weighted assets 8.51% 8.38%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 152,148 $ 151,031
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 $ 236,674 $ 234,937
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 7.00%
Tier 1 leverage capital $ 299,707 $ 293,338
Tier 1 leverage capital to average assets 0.0845 0.0843
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 141,847 $ 139,145
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 $ 141,847 $ 139,145
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 $ 384,542 $ 376,310
Total capital to risk-weighted assets 0.1137 0.1121
Total capital, Minimum Required for Capital Adequacy Purposes $ 270,553 $ 268,595
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 $ 355,101 $ 352,531
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 $ 338,191 $ 335,744
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.1000 0.1000
Tier 1 capital $ 349,624 $ 343,604
Tier 1 capital to risk-weighted assets 0.1034 0.1023
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 202,915 $ 201,446
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 $ 287,462 $ 285,382
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 $ 270,553 $ 268,595
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 $ 349,624 $ 343,604
Common equity tier 1 capital to risk-weighted assets 10.34% 10.23%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 152,186 $ 151,085
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 $ 236,734 $ 235,021
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 $ 219,824 $ 218,233
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 $ 349,624 $ 343,604
Tier 1 leverage capital to average assets 0.0986 0.0987
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 141,889 $ 139,262
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 $ 141,889 $ 139,262
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 $ 177,361 $ 174,077
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0500 0.0500