Targeted and Actual Weighted Average Asset Allocations by Plan Asset Category (Detail)	Dec. 31, 2013		Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%		100.00%
Targeted Range 39 to 78 percent
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	65.00%		76.00%
Bancorp common stock	2.00%		1.00%
Defined Benefit Plan Total Equity Securities	67.00%	[1]	77.00%	[1]
Targeted Range 11 to 41 Percent
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	22.00%		20.00%
Targeted Range 0 to 18 Percent
Defined Benefit Plan Disclosure [Line Items]
Alternative Strategies	7.00%
Targeted Range 0 to 10 Percent
Defined Benefit Plan Disclosure [Line Items]
Cash	4.00%	[2]	3.00%	[2]

[1] Includes mutual and exchange traded funds

[2] Cash was held in a Federated Prime Cash Obligation Fund in 2013 and in a Fifth Third Money Market Fund in 2012.