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Regulatory Matters (Actual and Required Capital Ratios) (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2019
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Cullen/Frost [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common Equity Tier One to Risk-Weighted Assets, Actual, Capital Amount | $ 3,751,200 | $ 3,371,043 |
Common Equity Tier One Risk-Based Capital Ratio, Actual | 12.85% | 13.13% |
Common Equity Tier One Capital Required For Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,042,876 | $ 1,796,549 |
Common Equity Tier One Risk Based Capital To Risk Weighted Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 7.00% | 7.00% | 7.00%
Tier 1 Capital to Risk-Weighted Assets, Actual, Capital Amount | $ 3,896,652 | $ 3,516,495 |
Tier 1 Capital to Risk-Weighted Assets, Actual, Ratio | 13.35% | 13.70% |
Tier One Risk Based Capital Required For Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,480,635 | $ 2,181,523 |
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 8.50% | 8.50% | 8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount | $ 1,751,036 | $ 1,539,899 |
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 | $ 4,330,982 | $ 3,966,244 |
Total Capital to Risk-Weighted Assets, Actual, Ratio | 14.84% | 15.45% | 8.00%
Capital Required for Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 3,064,313 | $ 2,694,823 |
Capital Required for Capital Adequacy to Risk Weighted Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 10.50% | 10.50% | 10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount | $ 2,918,394 | $ 2,566,498 |
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 10.00% | 10.00% |
Leverage Ratio, Actual, Capital Amount | $ 3,896,652 | $ 3,516,495 |
Leverage Ratio, Actual, Ratio | 7.29% | 7.34% |
Tier One Leverage Capital Required for Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,136,680 | $ 1,917,533 |
Tier One Leverage Capital Required for Capital Adequacy to Average Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 4.00% | 4.00% | 4.00%
Frost Bank [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common Equity Tier One to Risk-Weighted Assets, Actual, Capital Amount | $ 3,789,056 | $ 3,261,532 |
Common Equity Tier One Risk-Based Capital Ratio, Actual | 13.00% | 12.72% |
Common Equity Tier One Capital Required For Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,040,388 | $ 1,795,221 |
Common Equity Tier One Risk Based Capital To Risk Weighted Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 7.00% | 7.00% | 7.00%
Common Equity Tier One Capital Required To Be Well Capitalized, Capital Amount | $ 1,894,646 | $ 1,666,991 |
Common Equity Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum | 6.50% | 6.50% |
Tier 1 Capital to Risk-Weighted Assets, Actual, Capital Amount | $ 3,789,056 | $ 3,261,532 |
Tier 1 Capital to Risk-Weighted Assets, Actual, Ratio | 13.00% | 12.72% |
Tier One Risk Based Capital Required For Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,477,614 | $ 2,179,911 |
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 8.50% | 8.50% | 8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount | $ 2,331,872 | $ 2,051,681 |
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 | $ 4,023,386 | $ 3,491,281 |
Total Capital to Risk-Weighted Assets, Actual, Ratio | 13.80% | 13.61% | 8.00%
Capital Required for Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 3,060,583 | $ 2,692,831 |
Capital Required for Capital Adequacy to Risk Weighted Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 10.50% | 10.50% | 10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount | $ 2,914,841 | $ 2,564,601 |
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Ratio | 10.00% | 10.00% |
Leverage Ratio, Actual, Capital Amount | $ 3,789,056 | $ 3,261,532 |
Leverage Ratio, Actual, Ratio | 7.09% | 6.80% |
Tier One Leverage Capital Required for Capital Adequacy Minimum Capital Required Plus Capital Conservation Buffer, Capital Amount | $ 2,136,316 | $ 1,917,679 |
Tier One Leverage Capital Required for Capital Adequacy to Average Assets Minimum Capital Required Plus Capital Conservation Buffer, Ratio | 4.00% | 4.00% | 4.00%
Leverage Ratio, Required to be Considered Well Capitalized, Capital Amount | $ 2,670,395 | $ 2,397,099 |
Leverage Ratio, Required to be Considered Well Capitalized, Ratio | 5.00% | 5.00% |

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