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Capital Requirements (Capital Amounts and Ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Parent Company    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 2,232,723 $ 2,057,928
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2021% 0.2047%
Total Capital (to Risk Weighted Assets), Actual Amount $ 2,455,468 $ 2,284,579
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2222 0.2273
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 2,324,903 $ 2,170,682
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2104 0.2159
Tier 1 Capital (to Average Assets), Actual Amount $ 2,324,903 $ 2,170,682
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1459 0.1394
Parent Company | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 773,398 $ 703,710
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.07% 0.07%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 1,160,096 $ 1,055,565
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.10500 0.10500
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 939,126 $ 854,505
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.08500 0.08500
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 637,578 $ 622,671
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.0400 0.0400
International Bank of Commerce Laredo    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 1,310,616 $ 1,287,687
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.1807% 0.1974%
Total Capital (to Risk Weighted Assets), Actual Amount $ 1,401,298 $ 1,367,487
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.1932 0.2097
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 1,310,616 $ 1,287,687
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.1807 0.1974
Tier 1 Capital (to Average Assets), Actual Amount $ 1,310,616 $ 1,287,687
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1309 0.1114
International Bank of Commerce Laredo | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 507,625 $ 456,544
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 471,366 $ 423,934
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.07% 0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.065% 0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 761,438 $ 684,816
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 725,179 $ 652,206
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.10500 0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.1000 0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 616,402 $ 554,375
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 580,143 $ 521,764
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.08500 0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0800 0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 400,489 $ 462,225
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 500,611 $ 577,781
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.0400 0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0500 0.0500
International Bank of Commerce Brownsville    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 363,093 $ 221,567
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2086% 0.1859%
Total Capital (to Risk Weighted Assets), Actual Amount $ 383,804 $ 232,454
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2205 0.1950
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 363,093 $ 221,567
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2086 0.1859
Tier 1 Capital (to Average Assets), Actual Amount $ 363,093 $ 221,567
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.0895 0.1149
International Bank of Commerce Brownsville | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 121,855 $ 83,452
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 113,151 $ 77,491
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.07% 0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.065% 0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 182,782 $ 125,178
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 174,078 $ 119,217
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.10500 0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.1000 0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 147,966 $ 101,334
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 139,262 $ 95,374
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.08500 0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0800 0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 162,246 $ 77,164
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 202,808 $ 96,455
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.0400 0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0500 0.0500
International Bank Of Commerce Oklahoma    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 232,689 $ 315,957
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2117% 0.198%
Total Capital (to Risk Weighted Assets), Actual Amount $ 243,739 $ 334,495
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2218 0.2096
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 232,689 $ 315,957
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2117 0.1980
Tier 1 Capital (to Average Assets), Actual Amount $ 232,689 $ 315,957
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1348 0.2017
International Bank Of Commerce Oklahoma | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 76,941 $ 111,690
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 71,445 $ 103,712
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.07% 0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.065% 0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 115,412 $ 167,535
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 109,916 $ 159,557
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.10500 0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.1000 0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 93,429 $ 135,623
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 87,933 $ 127,645
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.08500 0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0800 0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 69,028 $ 62,663
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 86,286 $ 78,329
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.0400 0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0500 0.0500
Commerce Bank    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 98,087 $ 75,303
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.4226% 0.4225%
Total Capital (to Risk Weighted Assets), Actual Amount $ 100,798  
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.4343 0.4340
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 98,087 $ 77,354
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.4226 0.4225
Tier 1 Capital (to Average Assets), Actual Amount $ 98,087 $ 75,303
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1439 0.1615
Commerce Bank | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 16,248 $ 12,475
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 15,088 $ 11,584
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.07% 0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.065% 0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 24,372 $ 18,713
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 23,212 $ 17,822
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.10500 0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.1000 0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 19,730 $ 15,149
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 18,569 $ 14,258
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.08500 0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0800 0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 27,270 $ 18,651
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 34,088 $ 23,314
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.0400 0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0500 0.0500
International Bank of Commerce Zapata    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 71,418 $ 102,375
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.377% 0.4606%
Total Capital (to Risk Weighted Assets), Actual Amount $ 73,420 $ 104,996
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.3876 0.4724
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 71,418 $ 102,375
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.3770 0.4606
Tier 1 Capital (to Average Assets), Actual Amount $ 71,418 $ 102,375
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1500 0.1610
International Bank of Commerce Zapata | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 13,261 $ 15,559
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 12,314 $ 14,448
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.07% 0.07%
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.065% 0.065%
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 19,892 $ 23,339
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 18,945 $ 22,227
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.10500 0.10500
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.1000 0.1000
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 16,103 $ 18,893
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 15,156 $ 17,782
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.08500 0.08500
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0800 0.0800
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 19,048 $ 25,441
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 23,811 $ 31,801
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.0400 0.0400
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.0500 0.0500