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Regulatory Capital - Regulatory Capital Ratios (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 392,359 $ 375,440
Total capital to risk-weighted assets 0.1145 0.1119
Total capital, Minimum Required for Capital Adequacy Purposes $ 274,074 $ 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 $ 359,722 $ 352,406
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 307,878 $ 293,338
Tier 1 capital to risk-weighted assets 0.0899 0.0874
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 205,556 $ 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 $ 291,204 $ 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 $ 295,886 $ 281,346
Common equity tier 1 capital to risk-weighted assets 8.64% 8.38%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 154,167 $ 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 $ 239,815 $ 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 $ 307,878 $ 293,338
Tier 1 leverage capital to average assets 0.0851 0.0843
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 144,664 $ 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 $ 144,664 $ 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 $ 392,709 $ 376,310
Total capital to risk-weighted assets 0.1146 0.1121
Total capital, Minimum Required for Capital Adequacy Purposes $ 274,045 $ 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 $ 359,684 $ 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 $ 342,556 $ 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 $ 357,723 $ 343,604
Tier 1 capital to risk-weighted assets 0.1044 0.1023
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 205,534 $ 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 $ 291,173 $ 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 $ 274,045 $ 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 $ 357,723 $ 343,604
Common equity tier 1 capital to risk-weighted assets 10.44% 10.23%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 154,150 $ 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 $ 239,789 $ 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 $ 222,662 $ 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 $ 357,723 $ 343,604
Tier 1 leverage capital to average assets 0.0989 0.0987
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 144,682 $ 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 $ 144,682 $ 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 $ 180,852 $ 174,077
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.05 0.05