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Regulatory Capital - Regulatory Capital Ratios (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 452,731 $ 421,639
Total capital to risk-weighted assets 0.1218 0.1208
Total capital, Minimum Required for Capital Adequacy Purposes $ 297,419 $ 279,330
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 0.08 0.08
Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 390,363 $ 366,621
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 359,409 $ 329,796
Tier 1 capital to risk-weighted assets 0.0967 0.0945
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 223,064 $ 209,498
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 0.06 0.06
Tier One Risk Based Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 316,008 $ 296,788
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 $ 347,417 $ 317,804
Common equity tier 1 capital to risk-weighted assets 9.34% 9.10%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 167,298 $ 157,123
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 $ 260,242 $ 244,414
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 7.00%
Tier 1 leverage capital $ 359,409 $ 329,796
Tier 1 leverage capital to average assets 0.0887 0.0878
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 162,031 $ 150,256
Tier 1 leverage capital to average assets, Minimum Required for Capital Adequacy Purposes 0.04 0.04
Tier One Leverage Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 162,031 $ 150,256
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 $ 450,613 $ 417,965
Total capital to risk-weighted assets 0.1212 0.1197
Total capital, Minimum Required for Capital Adequacy Purposes $ 297,482 $ 279,342
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 0.08 0.08
Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 390,445 $ 366,636
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 $ 371,853 $ 349,177
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.10 0.10
Tier 1 capital $ 412,067 $ 380,811
Tier 1 capital to risk-weighted assets 0.1108 0.1091
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 223,112 $ 209,506
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 0.06 0.06
Tier One Risk Based Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 316,075 $ 296,801
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 $ 297,482 $ 279,342
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.08 0.08
Common equity tier 1 capital $ 412,067 $ 380,811
Common equity tier 1 capital to risk-weighted assets 11.08% 10.91%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 167,334 $ 157,130
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 $ 260,297 $ 244,424
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 $ 241,704 $ 226,965
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 $ 412,067 $ 380,811
Tier 1 leverage capital to average assets 0.1018 0.1017
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 161,895 $ 150,207
Tier 1 leverage capital to average assets, Minimum Required for Capital Adequacy Purposes 0.04 0.04
Tier One Leverage Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 161,895 $ 150,207
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 $ 202,369 $ 187,759
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.05 0.05