Regulatory Matters (Schedule Of Compliance With Regulatory Capital Requirements Under Banking Regulations) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount $ 54,209 $ 61,151
Total capital (to risk-weighted assets), Actual, Ratio 8.40% 9.00%
Total capital (to risk-weighted assets), To Be Adequately Capitalized, Amount 51,720 54,184
Total capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio 8.00% 8.00%
Tier 1 capital (to risk-weighted assets), Actual, Amount 30,873 37,194
Tier 1 capital (to risk-weighted assets), Actual, Ratio 4.80% 5.50%
Tier 1 capital (to risk-weighted assets), To Be Adequately Capitalized, Amount 25,860 27,092
Tier 1 capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio 4.00% 4.00%
Tier 1 leverage ratio (to average assets), Actual, Amount 30,873 37,194
Tier 1 leverage ratio (to average assets), Actual, Ratio 3.40% 3.70%
Tier 1 leverage ratio (to average assets), To Be Adequately Capitalized, Amount 36,500 39,768
Tier 1 leverage ratio (to average assets), To Be Adequately Capitalized, Ratio 4.00% 4.00%
Centrue Bank [Member]
   
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual, Amount 66,378 68,637
Total capital (to risk-weighted assets), Actual, Ratio 10.50% 10.30%
Total capital (to risk-weighted assets), To Be Adequately Capitalized, Amount 50,789 53,409
Total capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio 8.00% 8.00%
Total capital (to risk-weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 63,486 66,762
Total capital (to risk-weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 10.00% 10.00%
Tier 1 capital (to risk-weighted assets), Actual, Amount 58,280 60,133
Tier 1 capital (to risk-weighted assets), Actual, Ratio 9.20% 9.00%
Tier 1 capital (to risk-weighted assets), To Be Adequately Capitalized, Amount 25,395 26,705
Tier 1 capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio 4.00% 4.00%
Tier 1 capital (to risk-weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount 38,092 40,057
Tier 1 capital (to risk-weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 6.00% 6.00%
Tier 1 leverage ratio (to average assets), Actual, Amount 58,280 60,133
Tier 1 leverage ratio (to average assets), Actual, Ratio 6.40% 6.10%
Tier 1 leverage ratio (to average assets), To Be Adequately Capitalized, Amount 36,412 39,681
Tier 1 leverage ratio (to average assets), To Be Adequately Capitalized, Ratio 4.00% 4.00%
Tier 1 leverage ratio (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 45,515 $ 49,602
Tier 1 leverage ratio (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 5.00% 5.00%