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Capital Requirements (Capital Amounts and Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
Jul. 31, 2013
Capital Requirements          
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)     2.50% 0.625%  
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)         6.00%
Minimum          
Capital Requirements          
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent)     4.50%    
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent)         4.00%
Parent Company          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 1,711,682 $ 1,584,665      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 17.55% 17.11%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 1,925,905 $ 1,807,107      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 1,859,536 1,734,595      
Tier 1 Capital (to Average Assets), Actual Amount $ 1,859,536 $ 1,734,595      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 19.74% 19.51%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 19.06% 18.73%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 15.87% 14.62%      
Parent Company | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 621,850 $ 532,579      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 6.375% 5.75%      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 963,258 $ 856,757      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 768,168 671,512      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 468,593 $ 474,675      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.875% 9.25%      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 7.875% 7.25%      
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          
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 1,201,462 $ 1,119,173      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 17.24% 17.10%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 1,248,107 $ 1,173,068      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 1,201,462 1,119,173      
Tier 1 Capital (to Average Assets), Actual Amount $ 1,201,462 $ 1,119,173      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 17.91% 17.93%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 17.24% 17.10%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 14.45% 13.44%      
International Bank of Commerce, Laredo | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 444,207 $ 376,245      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 452,917 $ 425,320      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 6.375% 5.75%      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.50% 6.50%      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 688,086 $ 605,263      
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 696,796 654,339      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 548,727 474,395      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 557,437 523,471      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 332,507 333,166      
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 415,634 $ 416,458      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.875% 9.25%      
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) 7.875% 7.25%      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 8.00% 8.00%      
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 Oklahoma          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 188,997 $ 169,279      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 13.95% 13.41%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 198,293 $ 178,057      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 188,997 169,279      
Tier 1 Capital (to Average Assets), Actual Amount $ 188,997 $ 169,279      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 14.64% 14.11%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 13.95% 13.41%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 12.53% 11.31%      
International Bank Of Commerce Oklahoma | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 86,344 $ 72,586      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 88,037 $ 82,054      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 6.375% 5.75%      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.50% 6.50%      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 133,749 $ 116,769      
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 135,442 126,237      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 106,660 91,521      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 108,354 100,989      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 60,344 59,854      
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 75,430 $ 74,818      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.875% 9.25%      
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) 7.875% 7.25%      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 8.00% 8.00%      
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          
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 177,456 $ 165,034      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 24.73% 25.94%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 183,554 $ 170,613      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 177,456 165,034      
Tier 1 Capital (to Average Assets), Actual Amount $ 177,456 $ 165,034      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 25.58% 26.82%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 24.73% 25.94%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 17.25% 17.17%      
International Bank of Commerce, Brownsville | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 45,741 $ 36,583      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 46,638 $ 41,355      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 6.375% 5.75%      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.50% 6.50%      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 70,854 $ 58,851      
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 71,750 63,623      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 56,503 46,127      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 57,400 50,899      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 41,144 38,440      
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 51,430 $ 48,050      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.875% 9.25%      
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) 7.875% 7.25%      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 8.00% 8.00%      
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          
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 70,984 $ 66,406      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 30.77% 30.58%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 73,726 $ 68,718      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 70,984 66,406      
Tier 1 Capital (to Average Assets), Actual Amount $ 70,984 $ 66,406      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 31.96% 31.64%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 30.77% 30.58%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 16.22% 14.20%      
International Bank of Commerce, Zapata | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 14,707 $ 12,487      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 14,996 $ 14,116      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 6.375% 5.75%      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.50% 6.50%      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 22,782 $ 20,088      
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 23,070 21,717      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 18,168 15,745      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 18,456 17,374      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 17,507 18,701      
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 21,884 $ 23,376      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.875% 9.25%      
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) 7.875% 7.25%      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 8.00% 8.00%      
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          
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 89,305 $ 79,330      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 32.95% 33.22%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 90,894        
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 89,305 $ 81,278      
Tier 1 Capital (to Average Assets), Actual Amount $ 89,305 $ 79,330      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 33.54% 34.03%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 32.95% 33.22%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 15.53% 14.56%      
Commerce Bank | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 17,276 $ 13,733      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 17,615 $ 15,524      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 6.375% 5.75%      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 6.50% 6.50%      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 26,761 $ 22,092      
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 27,100 23,884      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 21,341 17,316      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 21,680 19,107      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 23,000 21,789      
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 28,750 $ 27,236      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.875% 9.25%      
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) 7.875% 7.25%      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 8.00% 8.00%      
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%