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Capital Requirements (Capital Amounts and Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Parent Company    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 1,833,174 $ 1,711,682
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 18.58% 17.55%
Total Capital (to Risk Weighted Assets), Actual Amount $ 2,018,488 $ 1,925,905
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 1,953,711 1,859,536
Tier 1 Capital (to Average Assets), Actual Amount $ 1,953,711 $ 1,859,536
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 20.46% 19.74%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 19.80% 19.06%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 16.65% 15.87%
Parent Company | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 690,746 $ 621,850
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 7.00% 6.375%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 1,036,118 $ 963,258
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 838,762 768,168
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 469,267 $ 468,593
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 10.50% 9.875%
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 8.50% 7.875%
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 $ 1,268,078 $ 1,201,462
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 18.23% 17.24%
Total Capital (to Risk Weighted Assets), Actual Amount $ 1,315,453 $ 1,248,107
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 1,268,078 1,201,462
Tier 1 Capital (to Average Assets), Actual Amount $ 1,268,078 $ 1,201,462
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 18.91% 17.91%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 18.23% 17.24%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 15.21% 14.45%
International Bank of Commerce, Laredo | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 486,950 $ 444,207
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 452,168 $ 452,917
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 7.00% 6.375%
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 $ 730,425 $ 688,086
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 695,643 696,796
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 591,296 548,727
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 556,514 557,437
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 333,576 332,507
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 416,970 $ 415,634
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 10.50% 9.875%
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) 8.50% 7.875%
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 $ 201,202 $ 188,997
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 16.91% 13.95%
Total Capital (to Risk Weighted Assets), Actual Amount $ 206,807 $ 198,293
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 201,202 188,997
Tier 1 Capital (to Average Assets), Actual Amount $ 201,202 $ 188,997
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 17.38% 14.64%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 16.91% 13.95%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 14.79% 12.53%
International Bank Of Commerce Oklahoma | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 83,303 $ 86,344
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 77,353 $ 88,037
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 7.00% 6.375%
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 $ 124,955 $ 133,749
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 119,004 135,442
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 101,154 106,660
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 95,203 108,354
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 54,406 60,344
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 68,007 $ 75,430
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 10.50% 9.875%
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) 8.50% 7.875%
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 $ 185,112 $ 177,456
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 22.70% 24.73%
Total Capital (to Risk Weighted Assets), Actual Amount $ 192,417 $ 183,554
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 185,112 177,456
Tier 1 Capital (to Average Assets), Actual Amount $ 185,112 $ 177,456
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 23.60% 25.58%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 22.70% 24.73%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 17.41% 17.25%
International Bank of Commerce, Brownsville | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 57,084 $ 45,741
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 53,006 $ 46,638
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 7.00% 6.375%
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 $ 85,626 $ 70,854
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 81,548 71,750
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 69,316 56,503
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 65,239 57,400
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 42,529 41,144
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 53,161 $ 51,430
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 10.50% 9.875%
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) 8.50% 7.875%
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 $ 72,402 $ 70,984
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 36.46% 30.77%
Total Capital (to Risk Weighted Assets), Actual Amount $ 74,737 $ 73,726
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 72,402 70,984
Tier 1 Capital (to Average Assets), Actual Amount $ 72,402 $ 70,984
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 37.63% 31.96%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 36.46% 30.77%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 19.08% 16.22%
International Bank of Commerce, Zapata | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 13,902 $ 14,707
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 12,909 $ 14,996
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 7.00% 6.375%
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 $ 20,853 $ 22,782
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 19,860 23,070
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 16,881 18,168
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 15,888 18,456
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 15,179 17,507
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 18,974 $ 21,884
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 10.50% 9.875%
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) 8.50% 7.875%
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 $ 91,239 $ 89,305
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 34.83% 32.95%
Total Capital (to Risk Weighted Assets), Actual Amount $ 93,396  
Tier 1 Capital (to Risk Weighted Assets), Actual Amount 91,239 $ 90,894
Tier 1 Capital (to Average Assets), Actual Amount $ 91,239 $ 89,305
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 35.65% 33.54%
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 34.83% 32.95%
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 18.18% 15.53%
Commerce Bank | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 18,336 $ 17,276
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 17,026 $ 17,615
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 7.00% 6.375%
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 $ 27,504 $ 26,761
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 26,195 27,100
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount 22,265 21,341
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 20,956 21,680
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount 20,073 23,000
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 25,091 $ 28,750
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 10.50% 9.875%
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) 8.50% 7.875%
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%