Asset Allocation for the Pension Plans and the Target Allocation, by Asset Category (Detail)					12 Months Ended						12 Months Ended						12 Months Ended
	Dec. 31, 2012 Pension Plans, Defined Benefit		Dec. 31, 2011 Pension Plans, Defined Benefit		Dec. 31, 2012 Equity Securities		Dec. 31, 2012 Equity Securities Pension Plans, Defined Benefit		Dec. 31, 2011 Equity Securities Pension Plans, Defined Benefit		Dec. 31, 2012 Debt Securities [Member]		Dec. 31, 2012 Debt Securities [Member] Pension Plans, Defined Benefit		Dec. 31, 2011 Debt Securities [Member] Pension Plans, Defined Benefit		Dec. 31, 2012 Cash Equivalents [Member]		Dec. 31, 2012 Cash Equivalents [Member] Pension Plans, Defined Benefit		Dec. 31, 2011 Cash Equivalents [Member] Pension Plans, Defined Benefit
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum					50.00%	[1]					25.00%	[1]					0.00%	[1]
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum					75.00%	[1]					50.00%	[1]					5.00%	[1]
Defined Benefit Plan, Percentage of Plan Assets [Abstract]
Percentage of Plan Assets	100.00%	[2]	100.00%	[2]			59.00%	[2]	61.00%	[2]			39.00%	[2]	37.00%	[2]			2.00%	[2]	2.00%	[2]

[1] 1SunTrust Pension Plan only.

[2] 2SunTrust and NCF Pension Plans.