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Regulatory Capital (Regulatory Capital Ratios) (Details) - First Business Bank - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 224,649 $ 220,474
Total capital to risk-weighted assets 11.83% 11.49%
Total capital, Minimum Required for Capital Adequacy Purposes $ 151,978 $ 153,456
Total capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 8.00% 8.00%
Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 199,472 $ 189,422
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 9.875%
Total capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 189,973 $ 191,820
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 10.00% 10.00%
Tier 1 capital $ 200,924 $ 197,093
Tier 1 capital to risk-weighted assets 10.58% 10.27%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 113,984 $ 115,092
Tier 1 capital to risk-weighted assets, Minimum Required for Capital Adequacy Purposes 6.00% 6.00%
Tier One Risk Based Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 161,477 $ 151,058
Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 8.50% 7.875%
Tier 1 capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 151,978 $ 153,456
Tier 1 capital to risk weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 8.00% 8.00%
Common equity tier 1 capital $ 200,924 $ 197,093
Common equity tier 1 capital to risk-weighted assets 10.58% 10.27%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 85,488 $ 86,319
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 $ 132,981 $ 122,285
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 6.375%
Common equity tier 1 capital, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements $ 123,482 $ 124,683
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 $ 200,924 $ 197,093
Tier 1 leverage capital to average assets 10.28% 10.20%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 78,152 $ 77,301
Tier 1 leverage capital to average assets, Minimum Required for Capital Adequacy Purposes 4.00% 4.00%
Tier One Leverage Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 78,152 $ 77,301
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 $ 97,691 $ 96,626
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 5.00% 5.00%