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Capital and Regulatory Matters - Actual and Required Capital Ratios (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Cullen/Frost [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier 1 to Risk-Weighted Assets, Actual, Capital Amount | $ 3,943,110 | $ 3,751,200
Common Equity Tier 1 to Risk-Weighted Assets, Actual , Ratio | 13.42% | 12.85%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,056,052 | $ 2,042,876
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 7.00% | 7.00%
Tier 1 Capital to Risk-Weighted Assets, Actual, Capital Amount | $ 4,088,562 | $ 3,896,652
Tier 1 Capital to Risk-Weighted Assets, Actual, Ratio | 13.92% | 13.35%
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,496,634 | $ 2,480,635
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 8.50% | 8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount | $ 1,762,330 | $ 1,751,036
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 6.00% | 6.00%
Total Capital to Risk-Weighted Assets, Actual, Capital Amount | $ 4,520,634 | $ 4,330,982
Total Capital to Risk-Weighted Assets, Actual, Ratio | 15.39% | 14.84%
Total Capital to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 3,084,077 | $ 3,064,313
Total Capital to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 10.50% | 10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount | $ 2,937,217 | $ 2,918,394
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 10.00% | 10.00%
Leverage Ratio, Actual, Capital Amount | $ 4,088,562 | $ 3,896,652
Leverage Ratio, Actual, Ratio | 8.11% | 7.29%
Leverage Ratio, Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,016,414 | $ 2,136,680
Leverage Ratio, Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 4.00% | 4.00%
Frost Bank [Member] |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier 1 to Risk-Weighted Assets, Actual, Capital Amount | $ 3,973,809 | $ 3,789,056
Common Equity Tier 1 to Risk-Weighted Assets, Actual , Ratio | 13.55% | 13.00%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,053,467 | $ 2,040,388
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 7.00% | 7.00%
Common Equity Tier 1 to Risk-Weighted Assets, Required To Be Considered Well Capitalized, Capital Amount | $ 1,906,791 | $ 1,894,646
Common Equity Tier 1 to Risk-Weighted Assets, Required To Be Considered Well Capitalized, Ratio | 6.50% | 6.50%
Tier 1 Capital to Risk-Weighted Assets, Actual, Capital Amount | $ 3,973,809 | $ 3,789,056
Tier 1 Capital to Risk-Weighted Assets, Actual, Ratio | 13.55% | 13.00%
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,493,496 | $ 2,477,614
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 8.50% | 8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount | $ 2,346,820 | $ 2,331,872
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 8.00% | 8.00%
Total Capital to Risk-Weighted Assets, Actual, Capital Amount | $ 4,225,881 | $ 4,023,386
Total Capital to Risk-Weighted Assets, Actual, Ratio | 14.41% | 13.80%
Total Capital to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 3,080,201 | $ 3,060,583
Total Capital to Risk-Weighted Assets, Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 10.50% | 10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount | $ 2,933,525 | $ 2,914,841
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 10.00% | 10.00%
Leverage Ratio, Actual, Capital Amount | $ 3,973,809 | $ 3,789,056
Leverage Ratio, Actual, Ratio | 7.88% | 7.09%
Leverage Ratio, Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,015,896 | $ 2,136,316
Leverage Ratio, Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 4.00% | 4.00%
Leverage Ratio, Required to be Considered Well Capitalized, Capital Amount | $ 2,519,870 | $ 2,670,395
Leverage Ratio, Required to be Considered Well Capitalized, Ratio | 5.00% | 5.00%

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