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Retirement and Benefit Plans (Targeted and Actual Weighted Average Asset Allocations by Plan Asset Category) (Detail)
Dec. 31, 2017
Dec. 31, 2016
Equity securities    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Actual Plan Asset Allocations 76.00% 73.00%
Bancorp common stock 1.00% 2.00%
Total    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%
Targeted Range 60 to 90 Percent | Equity securities    
Defined Benefit Plan Disclosure    
Total equity securities [1],[2] 77.00% 75.00%
Targeted Range 5 to 25 Percent | Fixed-income securities    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Actual Plan Asset Allocations [2] 16.00% 14.00%
Targeted Range 3 to 11 Percent | Alternative strategies    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Actual Plan Asset Allocations [2] 3.00% 6.00%
Targeted Range 0 to 13 Percent | Cash    
Defined Benefit Plan Disclosure    
Defined Benefit Plan, Actual Plan Asset Allocations [2] 4.00% 5.00%
[1]

Includes mutual and exchange- traded funds .

[2]

These reflect the targeted ranges for both the years ended December 31, 2017 and 2016 .