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Capital Requirements - Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Capital Requirements    
Percentage of capital securities issued by trust qualifying as Tier II capital, minimum 25.00%  
Junior subordinated deferrable interest debentures $ 108,868 $ 108,868
Parent Company    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 2,893,228 $ 2,563,130
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2242% 0.2172%
Total Capital (to Risk Weighted Assets), Actual Amount $ 3,136,215 $ 2,790,171
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2431 0.2365
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 2,974,881 $ 2,642,492
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2306 0.2239
Tier 1 Capital (to Average Assets), Actual Amount $ 2,974,881 $ 2,642,492
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1884 0.1746
Parent Company | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 903,203 $ 825,968
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 $ 1,354,805 $ 1,238,952
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.105 0.105
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 1,096,747 $ 1,002,961
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.085 0.085
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 631,755 $ 605,262
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.04 0.04
International Bank of Commerce Laredo    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 1,638,720 $ 1,444,775
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.1946% 0.1854%
Total Capital (to Risk Weighted Assets), Actual Amount $ 1,744,057 $ 1,542,462
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2071 0.1979
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 1,638,720 $ 1,444,775
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.1946 0.1854
Tier 1 Capital (to Average Assets), Actual Amount $ 1,638,720 $ 1,444,775
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1767 0.164
International Bank of Commerce Laredo | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 589,359 $ 545,611
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 547,262 $ 506,639
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 $ 884,039 $ 818,416
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 841,942 $ 779,444
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.105 0.105
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.10 0.10
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 715,651 $ 662,527
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 673,554 $ 623,555
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.085 0.085
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.08 0.08
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 370,911 $ 352,412
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 463,639 $ 440,515
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.04 0.04
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.05 0.05
International Bank of Commerce Brownsville    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 554,879 $ 232,965
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2611% 0.2072%
Total Capital (to Risk Weighted Assets), Actual Amount $ 578,515 $ 247,031
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2722 0.2197
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 554,879 $ 232,965
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2611 0.2072
Tier 1 Capital (to Average Assets), Actual Amount $ 554,879 $ 232,965
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1308 0.1472
International Bank of Commerce Brownsville | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 148,761 $ 78,718
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 138,136 $ 73,095
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 $ 223,142 $ 118,076
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 212,516 $ 112,454
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.105 0.105
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.10 0.10
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 180,639 $ 95,586
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 170,013 $ 89,963
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.085 0.085
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.08 0.08
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 169,680 $ 63,294
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 212,100 $ 79,117
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.04 0.04
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.05 0.05
International Bank Of Commerce Oklahoma    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 240,023 $ 477,390
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2057% 0.2441%
Total Capital (to Risk Weighted Assets), Actual Amount $ 254,659 $ 500,268
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2182 0.2558
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 240,023 $ 477,390
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.2057 0.2441
Tier 1 Capital (to Average Assets), Actual Amount $ 240,023 $ 477,390
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1447 0.1179
International Bank Of Commerce Oklahoma | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 81,679 $ 136,883
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 75,845 $ 127,106
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 $ 122,519 $ 205,325
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 116,685 $ 195,547
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.105 0.105
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.10 0.10
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 99,182 $ 166,215
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 93,348 $ 156,438
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.085 0.085
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.08 0.08
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 66,341 $ 161,919
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 82,926 $ 202,398
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.04 0.04
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.05 0.05
Commerce Bank    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 102,200 $ 64,110
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.375% 0.3118%
Total Capital (to Risk Weighted Assets), Actual Amount $ 105,090  
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.3856 0.3243
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 102,200 $ 66,680
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.375 0.3118
Tier 1 Capital (to Average Assets), Actual Amount $ 102,200 $ 64,110
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1353 0.1326
Commerce Bank | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 19,077 $ 14,394
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 17,714 $ 13,366
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 $ 28,616 $ 21,591
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 27,253 $ 20,563
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.105 0.105
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.10 0.10
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 23,165 $ 17,478
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 21,802 $ 16,450
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.085 0.085
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.08 0.08
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 30,219 $ 19,338
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 37,774 $ 24,172
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.04 0.04
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.05 0.05
International Bank of Commerce Zapata    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 66,932 $ 97,334
Common Equity Tier 1 Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.3274% 0.3657%
Total Capital (to Risk Weighted Assets), Actual Amount $ 69,278 $ 100,660
Total Capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.3389 0.3782
Tier 1 Capital (to Risk Weighted Assets), Actual Amount $ 66,932 $ 97,334
Tier 1 capital (to Risk Weighted Assets), Actual Ratio (as a percent) 0.3274 0.3657
Tier 1 Capital (to Average Assets), Actual Amount $ 66,932 $ 97,334
Tier 1 capital (to Average Assets), Actual Ratio (as a percent) 0.1344 0.145
International Bank of Commerce Zapata | Minimum    
Capital Requirements    
Common Equity Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 14,310 $ 18,628
Common Equity Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 13,287 $ 17,298
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 $ 21,464 $ 27,943
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 20,442 $ 26,612
Total Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.105 0.105
Total Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.10 0.10
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Amount $ 17,376 $ 22,620
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 16,354 $ 21,290
Tier 1 Capital (to Risk Weighted Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.085 0.085
Tier 1 Capital (to Risk Weighted Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.08 0.08
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Amount $ 19,917 $ 26,858
Tier 1 Capital (to Average Assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 24,896 $ 33,572
Tier 1 Capital (to Average Assets), For Capital Adequacy Purposes Ratio (as a percent) 0.04 0.04
Tier 1 Capital (to Average Assets), To Be well Capitalized Under Prompt Corrective Action Provisions Ratio (as a percent) 0.05 0.05