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Regulatory Capital (Regulatory Capital Ratios) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations    
Total capital (to risk-weighted assets) $ 221,068 $ 214,501
Total capital to risk-weighted assets 11.87% 11.98%
Total capital, Minimum Required for Capital Adequacy Purposes $ 149,042 $ 143,219
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 $ 183,974 $ 165,597
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 9.875% 9.25%
Tier 1 capital (to risk-weighted assets) $ 174,038 $ 169,176
Tier 1 capital to risk-weighted assets 9.34% 9.45%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 111,781 $ 107,414
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 $ 146,713 $ 129,792
Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.875% 7.25%
Common equity tier 1 capital $ 164,012 $ 159,157
Common equity tier 1 capital to risk-weighted assets 8.80% 8.89%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 83,836 $ 80,561
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 $ 118,768 $ 102,939
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 6.375% 5.75%
Tier 1 leverage capital (to adjusted assets) $ 174,038 $ 169,176
Tier 1 leverage capital to average assets 9.25% 9.54%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 75,262 $ 70,920
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 $ 75,262 $ 70,920
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 (to risk-weighted assets) $ 213,343 $ 207,986
Total capital to risk-weighted assets 11.50% 11.66%
Total capital, Minimum Required for Capital Adequacy Purposes $ 148,355 $ 142,736
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 $ 183,125 $ 165,038
Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 9.875% 9.25%
Total capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 185,444 $ 178,420
Total capital to risk-weighted assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 10.00% 10.00%
Tier 1 capital (to risk-weighted assets) $ 190,160 $ 186,374
Tier 1 capital to risk-weighted assets 10.25% 10.45%
Tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 111,266 $ 107,052
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 $ 146,037 $ 129,354
Tier One Risk Based Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 7.875% 7.25%
Tier 1 capital, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements $ 148,355 $ 142,736
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 $ 190,160 $ 186,374
Common equity tier 1 capital to risk-weighted assets 10.25% 10.45%
Common equity tier 1 capital, Minimum Required for Capital Adequacy Purposes $ 83,450 $ 80,289
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 $ 118,220 $ 102,591
Common Equity Tier One Capital Required for Capital Adequacy Plus Conservation Buffer to Risk Weighted Assets 6.375% 5.75%
Common equity tier 1 capital, Minimum Required to Be Well Capitalized Under Prompt Corrective Action Requirements $ 120,538 $ 115,973
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 (to adjusted assets) $ 190,160 $ 186,374
Tier 1 leverage capital to average assets 10.15% 10.56%
Tier 1 leverage capital, Minimum Required for Capital Adequacy Purposes $ 74,938 $ 70,617
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 $ 74,938 $ 70,617
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 $ 93,672 $ 88,272
Tier 1 leverage capital to average assets, Minimum Required to be Well Capitalized Under Prompt Corrective Action Requirements 5.00% 5.00%