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Regulatory Capital - Regulatory Capital Ratios (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 407,421 $ 375,440
Total capital to risk-weighted assets 0.1172 0.1119
Total capital, Minimum Required for Capital Adequacy Purposes $ 278,219 $ 268,500
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 $ 365,162 $ 352,406
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 316,792 $ 293,338
Tier 1 capital to risk-weighted assets 0.0911 0.0874
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 208,664 $ 201,375
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 $ 295,607 $ 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 $ 304,800 $ 281,346
Common equity tier 1 capital to risk-weighted assets 8.76% 8.38%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 156,498 $ 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 $ 243,441 $ 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 $ 316,792 $ 293,338
Tier 1 leverage capital to average assets 0.0868 0.0843
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 145,944 $ 139,145
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 $ 145,944 $ 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 $ 402,567 $ 376,310
Total capital to risk-weighted assets 0.1157 0.1121
Total capital, Minimum Required for Capital Adequacy Purposes $ 278,257 $ 268,595
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 $ 365,212 $ 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 $ 347,821 $ 335,744
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.10 0.10
Tier 1 capital $ 366,597 $ 343,604
Tier 1 capital to risk-weighted assets 0.1054 0.1023
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 208,692 $ 201,446
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 $ 295,648 $ 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 $ 278,257 $ 268,595
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 $ 366,597 $ 343,604
Common equity tier 1 capital to risk-weighted assets 10.54% 10.23%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 156,519 $ 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 $ 243,474 $ 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 $ 226,083 $ 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 $ 366,597 $ 343,604
Tier 1 leverage capital to average assets 0.1005 0.0987
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 145,914 $ 139,262
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 $ 145,914 $ 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 $ 182,393 $ 174,077
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.05 0.05