Capital and Regulatory Matters (Tables)

3 Months Ended

Mar. 31, 2024

Banking Regulation, Common Equity Tier 1 Risk-Based Capital [Abstract]

The following table presents actual and required capital ratios as of March 31, 2024 and December 31, 2023 for Cullen/Frost and Frost Bank under the Basel III Capital Rules. Capital levels required to be considered well-capitalized are based upon prompt corrective action regulations, as amended to reflect the changes under the Basel III Capital Rules. See the 2023 Form 10-K for a more detailed discussion of the Basel III Capital Rules.


	Actual				Minimum Capital Required Plus Capital Conservation Buffer				Required to be Considered Well- Capitalized (1)
	Capital Amount		Ratio		Capital Amount		Ratio		Capital Amount		Ratio
March 31, 2024
Common Equity Tier 1 to Risk-Weighted Assets
Cullen/Frost	$	4,102,330	13.41	%	$	2,140,804	7.00	%	N/A		N/A
Frost Bank	4,146,611		13.57		2,138,279		7.00		$	1,985,545	6.50	%
Tier 1 Capital to Risk-Weighted Assets
Cullen/Frost	4,247,782		13.89		2,599,548		8.50		1,834,975		6.00
Frost Bank	4,146,611		13.57		2,596,482		8.50		2,443,748		8.00
Total Capital to Risk-Weighted Assets
Cullen/Frost	4,694,792		15.35		3,211,206		10.50		3,058,292		10.00
Frost Bank	4,433,621		14.51		3,207,419		10.50		3,054,685		10.00
Leverage Ratio
Cullen/Frost	4,247,782		8.44		2,012,280		4.00		N/A		N/A
Frost Bank	4,146,611		8.24		2,011,864		4.00		2,514,830		5.00

December 31, 2023
Common Equity Tier 1 to Risk-Weighted Assets
Cullen/Frost	$	4,036,945	13.25	%	$	2,132,516	7.00	%	N/A		N/A
Frost Bank	4,057,111		13.33		2,129,784		7.00		$	1,977,656	6.50	%
Tier 1 Capital to Risk-Weighted Assets
Cullen/Frost	4,182,397		13.73		2,589,484		8.50		1,827,871		6.00
Frost Bank	4,057,111		13.33		2,586,166		8.50		2,434,038		8.00
Total Capital to Risk-Weighted Assets
Cullen/Frost	4,625,760		15.18		3,198,774		10.50		3,046,452		10.00
Frost Bank	4,320,474		14.20		3,194,676		10.50		3,042,548		10.00
Leverage Ratio
Cullen/Frost	4,182,397		8.35		2,003,020		4.00		N/A		N/A
Frost Bank	4,057,111		8.10		2,003,152		4.00		2,503,940		5.00

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(1)“Well-capitalized” minimum Common Equity Tier 1 to Risk-Weighted Assets and Leverage Ratio are not formally defined under applicable banking regulations for bank holding companies.