XML 88 R78.htm IDEA: XBRL DOCUMENT v3.22.1
Capital and Regulatory Matters - Actual and Required Capital Ratios (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Cullen/Frost [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 to Risk-Weighted Assets, Actual, Capital Amount $ 3,412,080 $ 3,371,043
Common Equity Tier 1 to Risk-Weighted Assets, Actual , Ratio 12.78% 13.13%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Capital Amount $ 1,869,007 $ 1,796,549
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased In, Ratio 7.00% 7.00%
Common Equity Tier 1 to Risk-Weighted Assets, Required To Be Considered Well Capitalized, Capital Amount $ 1,735,506 $ 1,668,224
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 $ 3,557,532 $ 3,516,495
Tier 1 Capital to Risk-Weighted Assets, Actual, Ratio 13.32% 13.70%
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Capital Amount $ 2,269,508 $ 2,181,523
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Ratio 8.50% 8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount $ 2,136,007 $ 2,053,198
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 $ 3,998,333 $ 3,966,244
Total Capital to Risk-Weighted Assets, Actual, Ratio 14.97% 15.45%
Total Capital to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Capital Amount $ 2,803,510 $ 2,694,823
Total Capital to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Ratio 10.50% 10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount $ 2,670,009 $ 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 $ 3,557,532 $ 3,516,495
Leverage Ratio, Actual, Ratio 7.08% 7.34%
Leverage Ratio, Minimum Capital Required - Basel III Fully Phased-In, Capital Amount $ 2,010,897 $ 1,917,533
Leverage Ratio, Minimum Capital Required - Basel III Fully Phased-In, Ratio 4.00% 4.00%
Leverage Ratio, Required to be Considered Well Capitalized, Capital Amount $ 2,513,621 $ 2,396,917
Leverage Ratio, Required to be Considered Well Capitalized, Ratio 5.00% 5.00%
Frost Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common Equity Tier 1 to Risk-Weighted Assets, Actual, Capital Amount $ 3,301,515 $ 3,261,532
Common Equity Tier 1 to Risk-Weighted Assets, Actual , Ratio 12.39% 12.72%
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Capital Amount $ 1,865,304 $ 1,795,221
Common Equity Tier 1 to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased In, Ratio 7.00% 7.00%
Common Equity Tier 1 to Risk-Weighted Assets, Required To Be Considered Well Capitalized, Capital Amount $ 1,732,068 $ 1,666,991
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 $ 3,301,515 $ 3,261,532
Tier 1 Capital to Risk-Weighted Assets, Actual, Ratio 12.39% 12.72%
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Capital Amount $ 2,265,012 $ 2,179,911
Tier 1 Capital to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Ratio 8.50% 8.50%
Tier 1 Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount $ 2,131,776 $ 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 $ 3,542,316 $ 3,491,281
Total Capital to Risk-Weighted Assets, Actual, Ratio 13.29% 13.61%
Total Capital to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Capital Amount $ 2,797,956 $ 2,692,831
Total Capital to Risk-Weighted Assets, Minimum Capital Required - Basel III Fully Phased-In, Ratio 10.50% 10.50%
Total Capital to Risk-Weighted Assets, Required to be Considered Well Capitalized, Capital Amount $ 2,664,720 $ 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 $ 3,301,515 $ 3,261,532
Leverage Ratio, Actual, Ratio 6.57% 6.80%
Leverage Ratio, Minimum Capital Required - Basel III Fully Phased-In, Capital Amount $ 2,009,767 $ 1,917,679
Leverage Ratio, Minimum Capital Required - Basel III Fully Phased-In, Ratio 4.00% 4.00%
Leverage Ratio, Required to be Considered Well Capitalized, Capital Amount $ 2,512,209 $ 2,397,099
Leverage Ratio, Required to be Considered Well Capitalized, Ratio 5.00% 5.00%