Capital and Regulatory Matters (Tables)

6 Months Ended

Jun. 30, 2013

Banking And Thrift [Abstract]

Actual and Required Capital Ratios

Actual and required capital ratios for Cullen/Frost and Frost Bank were as follows:

	Actual					Minimum Required for Capital Adequacy Purposes					Required to be Considered Well Capitalized
	Capital Amount		Ratio			Capital Amount		Ratio			Capital Amount		Ratio
June 30, 2013
Total Capital to Risk-Weighted Assets
Cullen/Frost	$	2,011,267		15.39	%	$	1,045,233		8.00	%	$	1,306,541		10.00	%
Frost Bank		1,767,524		13.54			1,044,199		8.00			1,305,249		10.00
Tier 1 Capital to Risk-Weighted Assets
Cullen/Frost		1,857,867		14.22			522,616		4.00			783,925		6.00
Frost Bank		1,674,124		12.83			522,099		4.00			783,149		6.00
Leverage Ratio
Cullen/Frost		1,857,867		8.60			864,342		4.00			1,080,427		5.00
Frost Bank		1,674,124		7.75			863,558		4.00			1,079,448		5.00
December 31, 2012
Total Capital to Risk-Weighted Assets
Cullen/Frost	$	1,947,974		15.11	%	$	1,031,526		8.00	%	$	1,289,408		10.00	%
Frost Bank		1,730,444		13.43			1,030,878		8.00			1,288,597		10.00
Tier 1 Capital to Risk-Weighted Assets
Cullen/Frost		1,763,521		13.68			515,763		4.00			773,645		6.00
Frost Bank		1,625,991		12.62			515,439		4.00			773,158		6.00
Leverage Ratio
Cullen/Frost		1,763,521		8.28			851,483		4.00			1,064,354		5.00
Frost Bank		1,625,991		7.64			850,954		4.00			1,063,693		5.00