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Regulatory Capital (Regulatory Capital Ratios) (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 309,573 $ 281,745
Total capital to risk-weighted assets 0.1156 0.1082
Total capital, Minimum Required for Capital Adequacy Purposes $ 214,312 $ 208,337
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 $ 281,285 $ 273,443
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 250,331 $ 232,795
Tier 1 capital to risk-weighted assets 0.0934 0.0894
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 160,734 $ 156,253
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 $ 227,707 $ 221,358
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 $ 238,339 $ 222,719
Common equity tier 1 capital to risk-weighted assets 8.90% 8.55%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 120,551 $ 117,190
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 $ 187,523 $ 182,295
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 7.00%
Tier 1 leverage capital $ 250,331 $ 232,795
Tier 1 leverage capital to average assets 0.0919 0.0894
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 108,923 $ 104,145
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 $ 108,923 $ 104,145
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 $ 301,151 $ 280,448
Total capital to risk-weighted assets 0.1125 0.1078
Total capital, Minimum Required for Capital Adequacy Purposes $ 214,190 $ 208,142
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 $ 281,125 $ 273,187
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 $ 267,738 $ 260,178
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.1000 0.1000
Tier 1 capital $ 276,184 $ 255,286
Tier 1 capital to risk-weighted assets 0.1032 0.0981
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 160,643 $ 156,107
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 $ 227,577 $ 221,151
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 $ 214,190 $ 208,142
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 $ 276,184 $ 255,286
Common equity tier 1 capital to risk-weighted assets 10.32% 9.81%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 120,482 $ 117,080
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 $ 187,417 $ 182,124
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 $ 174,030 $ 169,116
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 $ 276,184 $ 255,286
Tier 1 leverage capital to average assets 0.1015 0.0981
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 108,823 $ 104,045
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 $ 108,823 $ 104,045
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 $ 136,029 $ 130,056
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0500 0.0500