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Stockholders' Equity and Regulatory Capital (Regulatory Capital Ratios) (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total Capital $ 258,607 $ 239,029
Total Capital to Risk-Weighted Assets 0.1125 0.1201
Total Capital, Minimum Required for Capital Adequacy Purposes $ 183,965 $ 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 $ 241,454 $ 208,930
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 10.50%
Tier 1 capital $ 206,104 $ 194,456
Tier 1 Capital to Risk-Weighted Assets 0.0896 0.0977
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 137,974 $ 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 $ 195,463 $ 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 One Capital $ 196,042 $ 184,409
Common Equity Tier One Capital to Risk-Weighted Assets 8.53% 9.27%
Common Equity Tier One Capital Required for Capital Adequacy $ 103,480 $ 89,541
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 160,970 $ 139,286
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.00% 7.00%
Tier 1 Capital $ 206,104 $ 194,456
Tier 1 Capital to Average Assets 0.0799 0.0927
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 103,228 $ 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 $ 103,228 $ 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 $ 251,116 $ 233,181
Total Capital to Risk-Weighted Assets 0.1097 0.1179
Total Capital, Minimum Required for Capital Adequacy Purposes $ 183,053 $ 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 $ 240,257 $ 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 $ 228,816 $ 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 $ 222,500 $ 212,315
Tier 1 Capital to Risk-Weighted Assets 0.0972 0.1074
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 137,290 $ 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 $ 194,494 $ 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 $ 183,053 $ 158,177
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0800 0.0800
Common Equity Tier One Capital $ 222,500 $ 212,315
Common Equity Tier One Capital to Risk-Weighted Assets 9.72% 10.74%
Common Equity Tier One Capital Required for Capital Adequacy $ 102,967 $ 88,974
Common Equity Tier One Capital Required for Capital Adequacy to Risk-Weighted Assets 4.50% 4.50%
Common Equity Tier One Capital Required for Capital Adequacy Plus Capital Conservation Buffer $ 160,171 $ 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 One Capital to be Well Capitalized $ 148,731 $ 128,519
Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets 6.50% 6.50%
Tier 1 Capital $ 222,500 $ 212,315
Tier 1 Capital to Average Assets 0.0867 0.1018
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 102,635 $ 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 $ 102,635 $ 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 $ 128,294 $ 104,268
Tier 1 Leverage Capital to Average Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 0.0500 0.0500