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Regulatory Capital (Regulatory Capital Ratios) (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital $ 252,325 $ 239,029
Total capital to risk-weighted assets 0.1142 0.1201
Total capital, Minimum Required for Capital Adequacy Purposes $ 176,728 $ 159,185
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 $ 231,956 $ 208,930
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 200,922 $ 194,456
Tier 1 capital to risk-weighted assets 0.0909 0.0977
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 132,546 $ 119,388
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 $ 187,774 $ 169,134
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 $ 190,864 $ 184,409
Common equity tier 1 capital to risk-weighted assets 8.64% 9.27%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 99,410 $ 89,541
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 $ 154,637 $ 139,286
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 7.00%
Tier 1 leverage capital $ 200,922 $ 194,456
Tier 1 leverage capital to average assets 0.0804 0.0927
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 99,940 $ 83,950
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 $ 99,940 $ 83,950
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 $ 243,967 $ 233,181
Total capital to risk-weighted assets 0.1111 0.1179
Total capital, Minimum Required for Capital Adequacy Purposes $ 175,634 $ 158,177
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 $ 230,519 $ 207,607
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 $ 219,542 $ 197,721
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.1000 0.1000
Tier 1 capital $ 216,469 $ 212,315
Tier 1 capital to risk-weighted assets 0.0986 0.1074
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 131,725 $ 118,633
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 $ 186,611 $ 168,063
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 $ 175,634 $ 158,177
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 $ 216,469 $ 212,315
Common equity tier 1 capital to risk-weighted assets 9.86% 10.74%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 98,794 $ 88,974
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 $ 153,680 $ 138,405
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 $ 142,702 $ 128,519
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 $ 216,469 $ 212,315
Tier 1 leverage capital to average assets 0.0872 0.1018
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 99,347 $ 83,414
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 $ 99,347 $ 83,414
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 $ 124,183 $ 104,268
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0500 0.0500