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Stockholders' Equity and Regulatory Capital (Regulatory Capital Ratios) (Details)
$ in Thousands
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total Capital $ 375,440 $ 323,893
Total Capital to Risk-Weighted Assets 0.1119 0.1126
Total Capital, Minimum Required for Capital Adequacy Purposes $ 268,500 $ 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 $ 352,406 $ 302,111
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 293,338 $ 264,843
Tier 1 Capital to Risk-Weighted Assets 0.0874 0.0920
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 201,375 $ 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 $ 285,281 $ 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 One Capital $ 281,346 $ 252,851
Common Equity Tier One Capital to Risk-Weighted Assets 8.38% 8.79%
Common Equity Tier One Capital Required for Capital Adequacy $ 151,031 $ 129,476
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 234,937 $ 201,407
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 7.00%
Tier 1 Capital $ 293,338 $ 264,843
Tier 1 Capital to Average Assets 0.0843 0.0917
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 139,145 $ 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 $ 139,145 $ 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 $ 376,310 $ 323,021
Total Capital to Risk-Weighted Assets 0.1121 0.1122
Total Capital, Minimum Required for Capital Adequacy Purposes $ 268,595 $ 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 $ 352,531 $ 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 $ 335,744 $ 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 $ 343,604 $ 298,312
Tier 1 Capital to Risk-Weighted Assets 0.1023 0.1036
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 201,446 $ 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 $ 285,382 $ 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 $ 268,595 $ 230,367
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0800 0.0800
Common Equity Tier One Capital $ 343,604 $ 298,312
Common Equity Tier One Capital to Risk-Weighted Assets 10.23% 10.36%
Common Equity Tier One Capital Required for Capital Adequacy $ 151,085 $ 129,581
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 235,021 $ 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 One Capital to be Well Capitalized $ 218,233 $ 187,173
Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets 6.50% 6.50%
Tier 1 Capital $ 343,604 $ 298,312
Tier 1 Capital to Average Assets 0.0987 0.1034
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 139,262 $ 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 $ 139,262 $ 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 $ 174,077 $ 144,252
Tier 1 Leverage Capital to Average Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0500 0.0500