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Regulatory Capital (Regulatory Capital Ratios) (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 309,524 $ 281,745
Total capital to risk-weighted assets 0.1187 0.1082
Total capital, Minimum Required for Capital Adequacy Purposes $ 208,565 $ 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 $ 273,742 $ 273,443
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 241,782 $ 232,795
Tier 1 capital to risk-weighted assets 0.0927 0.0894
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 156,424 $ 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 $ 221,600 $ 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 $ 229,790 $ 222,719
Common equity tier 1 capital to risk-weighted assets 8.81% 8.55%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 117,318 $ 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 $ 182,494 $ 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 $ 241,782 $ 232,795
Tier 1 leverage capital to average assets 0.0909 0.0894
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 106,443 $ 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 $ 106,443 $ 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 $ 288,441 $ 280,448
Total capital to risk-weighted assets 0.1107 0.1078
Total capital, Minimum Required for Capital Adequacy Purposes $ 208,364 $ 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 $ 273,477 $ 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 $ 260,455 $ 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 $ 264,023 $ 255,286
Tier 1 capital to risk-weighted assets 0.1014 0.0981
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 156,273 $ 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 $ 221,386 $ 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 $ 208,364 $ 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 $ 264,023 $ 255,286
Common equity tier 1 capital to risk-weighted assets 10.14% 9.81%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 117,205 $ 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 $ 182,318 $ 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 $ 169,296 $ 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 $ 264,023 $ 255,286
Tier 1 leverage capital to average assets 0.0995 0.0981
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 106,151 $ 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 $ 106,151 $ 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 $ 132,688 $ 130,056
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0500 0.0500