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Regulatory Capital (Regulatory Capital Ratios) (Details)
$ in Thousands
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 267,291 $ 258,607
Total capital to risk-weighted assets 0.1152 0.1125
Total capital, Minimum Required for Capital Adequacy Purposes $ 185,682 $ 183,965
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 $ 243,708 $ 241,454
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 214,510 $ 206,104
Tier 1 capital to risk-weighted assets 0.0924 0.0896
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 139,262 $ 137,974
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 $ 197,288 $ 195,463
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 $ 204,445 $ 196,042
Common equity tier 1 capital to risk-weighted assets 8.81% 8.53%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 104,446 $ 103,480
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 $ 162,472 $ 160,970
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 7.00%
Tier 1 leverage capital $ 214,510 $ 206,104
Tier 1 leverage capital to average assets 0.0837 0.0799
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 102,499 $ 103,228
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 $ 102,499 $ 103,228
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 $ 260,529 $ 251,116
Total capital to risk-weighted assets 0.1124 0.1097
Total capital, Minimum Required for Capital Adequacy Purposes $ 185,412 $ 183,053
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 $ 243,354 $ 240,257
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 $ 231,765 $ 228,816
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.1000 0.1000
Tier 1 capital $ 231,547 $ 222,500
Tier 1 capital to risk-weighted assets 0.0999 0.0972
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 139,059 $ 137,290
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 $ 197,001 $ 194,494
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 $ 185,412 $ 183,053
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 $ 231,547 $ 222,500
Common equity tier 1 capital to risk-weighted assets 9.99% 9.72%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 104,294 $ 102,967
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 $ 162,236 $ 160,171
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 $ 150,648 $ 148,731
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 $ 231,547 $ 222,500
Tier 1 leverage capital to average assets 0.0908 0.0867
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 102,027 $ 102,635
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 $ 102,027 $ 102,635
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 $ 127,534 $ 128,294
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0500 0.0500