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Fair Value Measurements (Nonrecurring Basis Significant Unobservable Inputs) (Details) - Fair Value, Measurements, Nonrecurring - Level 3 - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Loans      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value $ 13.8 $ 12.2 $ 19.8
Valuation Technique Market Approach Market Approach  
Unobservable Input Discount to reflect realizable value Discount to reflect realizable value  
OREO      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value $ 0.2 $ 0.3 $ 1.0
Valuation Technique Market Approach Market Approach  
Unobservable Input Discount to reflect realizable value Discount to reflect realizable value  
Lower Limit | Loans      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Range of Discounts Applied 15.00% 15.00%  
Lower Limit | OREO      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Range of Discounts Applied 15.00% 15.00%  
Upper Limit | Loans      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Range of Discounts Applied 25.00% 25.00%  
Upper Limit | OREO      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Range of Discounts Applied 20.00% 20.00%