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Capital Requirements (Capital Amounts and Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Jan. 01, 2016
Dec. 31, 2015
Jul. 31, 2013
Capital Requirements          
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent)     0.625% 2.50%  
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 $ 1,584,665 $ 1,468,662      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 17.11% 16.95%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 1,807,107 $ 1,687,501      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 1,734,595 1,618,935      
Tier 1 Capital (to Average Assets), Actual Amount $ 1,734,595 $ 1,618,935      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 19.51% 19.47%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 18.73% 18.68%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 14.62% 13.91%      
Parent Company | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 532,579 $ 444,190      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 5.75% 5.125%      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 856,757 $ 747,540      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 671,512 574,197      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 474,675 $ 465,438      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.25% 8.625%      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 7.25% 6.625%      
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 $ 1,119,173 $ 1,201,527      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 17.10% 16.63%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 1,173,068 $ 1,260,886      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 1,119,173 1,201,527      
Tier 1 Capital (to Average Assets), Actual Amount $ 1,119,173 $ 1,201,527      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 17.93% 17.45%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 17.10% 16.63%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 13.44% 12.50%      
International Bank of Commerce, Laredo | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 376,245 $ 370,342      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 425,320 $ 469,701      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 5.75% 5.125%      
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 $ 605,263 $ 623,258      
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 654,339 722,618      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 474,395 478,734      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 523,471 578,094      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 333,166 384,342      
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 416,458 $ 480,427      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.25% 8.625%      
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) 7.25% 6.625%      
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 $ 169,279        
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 13.41%        
Total Capital (to Risk Weighted Assets), Actual Amount $ 178,057        
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 169,279        
Tier 1 Capital (to Average Assets), Actual Amount $ 169,279        
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 14.11%        
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 13.41%        
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 11.31%        
International Bank Of Commerce Oklahoma | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 72,586        
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 82,054        
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 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%        
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 116,769        
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 126,237        
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 91,521        
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 100,989        
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 59,854        
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 74,818        
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.25%        
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 10.00%        
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 7.25%        
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 8.00%        
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 4.00%        
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 5.00%        
International Bank of Commerce, Brownsville          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 165,034 $ 158,533      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 25.94% 25.61%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 170,613 $ 163,937      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 165,034 158,533      
Tier 1 Capital (to Average Assets), Actual Amount $ 165,034 $ 158,533      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 26.82% 26.49%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 25.94% 25.61%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 17.17% 16.91%      
International Bank of Commerce, Brownsville | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 36,583 $ 31,720      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 41,355 $ 40,230      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 5.75% 5.125%      
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 $ 58,851 $ 53,382      
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 63,623 61,892      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 46,127 41,004      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 50,899 49,514      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 38,440 37,509      
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 48,050 $ 46,886      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.25% 8.625%      
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) 7.25% 6.625%      
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 $ 66,406 $ 65,989      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 30.58% 34.09%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 68,718 $ 67,464      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 66,406 65,989      
Tier 1 Capital (to Average Assets), Actual Amount $ 66,406 $ 65,989      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 31.64% 34.85%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 30.58% 34.09%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 14.20% 13.87%      
International Bank of Commerce, Zapata | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 12,487 $ 9,922      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 14,116 $ 12,584      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 5.75% 5.125%      
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 $ 20,088 $ 16,698      
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 21,717 19,360      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 15,745 12,826      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 17,374 15,488      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 18,701 19,029      
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 23,376 $ 23,786      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.25% 8.625%      
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) 7.25% 6.625%      
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 $ 79,330 $ 73,765      
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 33.22% 31.84%      
Total Capital (to Risk Weighted Assets), Actual Amount $ 81,278 $ 76,093      
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 79,330 73,765      
Tier 1 Capital (to Average Assets), Actual Amount $ 79,330 $ 73,765      
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 34.03% 32.85%      
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 33.22% 31.84%      
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 14.56% 13.05%      
Commerce Bank | Minimum          
Capital Requirements          
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 13,733 $ 11,872      
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 15,524 $ 15,058      
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 5.75% 5.125%      
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 $ 22,092 $ 19,980      
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 23,884 23,166      
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 17,316 15,347      
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 19,107 18,532      
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 21,789 22,607      
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 27,236 $ 28,259      
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 9.25% 8.625%      
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) 7.25% 6.625%      
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%