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Stockholders' Equity and Regulatory Capital (Regulatory Capital Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total Capital $ 239,029 $ 228,325
Total Capital to Risk-Weighted Assets 12.01% 11.85%
Total Capital, Minimum Required for Capital Adequacy Purposes $ 159,185 $ 154,080
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 $ 208,930 $ 190,192
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 10.50% 9.875%
Tier 1 capital $ 194,456 $ 181,175
Tier 1 Capital to Risk-Weighted Assets 9.77% 9.41%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 119,388 $ 115,560
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 $ 169,134 $ 151,672
Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 8.50% 7.875%
Common Equity Tier One Capital $ 184,409 $ 171,142
Common Equity Tier One Capital to Risk-Weighted Assets 9.27% 8.89%
Common Equity Tier One Capital Required for Capital Adequacy $ 89,541 $ 86,670
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 $ 139,286 $ 122,782
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.70% 6.375%
Tier 1 Capital $ 194,456 $ 181,175
Tier 1 Capital to Average Assets 9.27% 9.33%
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 83,950 $ 77,648
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 $ 83,950 $ 77,648
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 $ 233,181 $ 220,474
Total Capital to Risk-Weighted Assets 11.79% 11.49%
Total Capital, Minimum Required for Capital Adequacy Purposes $ 158,177 $ 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 $ 207,607 $ 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 $ 197,721 $ 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 $ 212,315 $ 197,093
Tier 1 Capital to Risk-Weighted Assets 10.74% 10.27%
Tier 1 Capital, Minimum Required for Capital Adequacy Purposes $ 118,633 $ 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 $ 168,063 $ 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 $ 158,177 $ 153,456
Tier 1 Capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 8.00% 8.00%
Common Equity Tier One Capital $ 212,315 $ 197,093
Common Equity Tier One Capital to Risk-Weighted Assets 10.74% 10.27%
Common Equity Tier One Capital Required for Capital Adequacy $ 88,974 $ 86,319
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 $ 138,405 $ 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 One Capital to be Well Capitalized $ 128,519 $ 124,683
Common Equity Tier One Capital Required to be Well Capitalized to Risk-Weighted Assets 6.50% 6.50%
Tier 1 Capital $ 212,315 $ 197,093
Tier 1 Capital to Average Assets 10.18% 10.20%
Tier 1 Leverage Capital, Minimum Required for Capital Adequacy Purposes $ 83,414 $ 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 $ 83,414 $ 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 $ 104,268 $ 96,626
Tier 1 Leverage Capital to Average Assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 5.00% 5.00%