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Capital Requirements (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Consolidated
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), Actual Amount $ 1,442,837 $ 1,328,089
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 1,369,657 1,266,799
Tier 1 Capital (to Average Assets), Actual Amount 1,369,657 1,266,799
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 20.36% 20.60%
Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 19.33% 19.65%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 11.61% 10.86%
Consolidated | Minimum
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 566,870 515,695
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 283,435 257,848
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 472,044 466,624
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 8.00% 8.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
International Bank of Commerce, Laredo
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), Actual Amount 1,035,189 945,384
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 969,731 892,888
Tier 1 Capital (to Average Assets), Actual Amount 969,731 892,888
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 16.96% 17.19%
Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 15.89% 16.23%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 10.09% 9.26%
International Bank of Commerce, Laredo | Minimum
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 488,303 440,038
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 610,378 550,048
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 244,151 220,019
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 366,227 330,029
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 384,497 385,621
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 480,622 482,026
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 8.00% 8.00%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 10.00% 10.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.00% 6.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 5.00% 5.00%
International Bank of Commerce, Brownsville
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), Actual Amount 143,879 128,788
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 138,467 123,361
Tier 1 Capital (to Average Assets), Actual Amount 138,467 123,361
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 27.63% 27.36%
Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 26.60% 26.21%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 13.33% 13.79%
International Bank of Commerce, Brownsville | Minimum
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 41,652 37,659
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 52,065 47,074
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 20,826 18,830
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 31,239 28,245
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 41,553 35,787
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 51,942 44,734
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 8.00% 8.00%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 10.00% 10.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.00% 6.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 5.00% 5.00%
International Bank of Commerce, Zapata
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), Actual Amount 57,675 54,542
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 56,459 52,967
Tier 1 Capital (to Average Assets), Actual Amount 56,459 52,967
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 32.65% 33.14%
Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 31.96% 32.18%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 10.64% 10.64%
International Bank of Commerce, Zapata | Minimum
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 14,130 13,166
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 17,663 16,458
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 7,065 6,583
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 10,598 9,875
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 21,219 19,918
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 26,523 24,897
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 8.00% 8.00%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 10.00% 10.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.00% 6.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 5.00% 5.00%
Commerce Bank
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), Actual Amount 64,585 60,982
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 63,491 59,200
Tier 1 Capital (to Average Assets), Actual Amount 63,491 59,200
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 36.45% 34.52%
Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 35.83% 33.52%
Tier 1 Capital (to Average Assets), Actual Ratio (as a percent) 11.88% 11.27%
Commerce Bank | Minimum
    
Capital Requirements    
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 14,175 14,131
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 17,719 17,664
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 7,087 7,065
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 10,631 10,598
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 21,372 21,004
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 26,715 $ 26,255
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 8.00% 8.00%
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 10.00% 10.00%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.00% 6.00%
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00% 4.00%
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 5.00% 5.00%