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Fair Value Measurements (Quantitative Information About Level 3 Fair Value Measurements for Certain Financial Assets) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Quantitative information about level 3 nonrecurring basis 8.00% 7.00%
Present value of cash flows discount rate 5.00% 5.00%
Other Real Estate Owned [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Quantitative information about level 3 nonrecurring basis 6.00% 6.00%
Nonrecurring [Member] | Maximum [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Quantitative information about level 3 nonrecurring basis 12.00% 12.00%
Present value of cash flows discount rate 6.00% 10.00%
Nonrecurring [Member] | Maximum [Member] | Other Real Estate Owned [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Quantitative information about level 3 nonrecurring basis 6.00% 6.00%
Nonrecurring [Member] | Minimum [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Quantitative information about level 3 nonrecurring basis 0.00% 6.00%
Present value of cash flows discount rate 4.00% 4.00%
Nonrecurring [Member] | Minimum [Member] | Other Real Estate Owned [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Quantitative information about level 3 nonrecurring basis 6.00% 6.00%