Fair Value (Quantitative Information of Fair Value Measurements) (Details) - Significant Unobservable Inputs (Level 3) - Impaired Loans $ in Thousands	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)
Commercial and Industrial Loans | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.00	0.00
Commercial and Industrial Loans | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	1.00	0.95
Commercial and Industrial Loans | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	1.00	0.84
Commercial Real Estate Loans | Valuation Technique, Discounted Cash Flow | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.18	0.30
Commercial Real Estate Loans | Valuation Technique, Discounted Cash Flow | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.76	0.76
Commercial Real Estate Loans | Valuation Technique, Discounted Cash Flow | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.54	0.47
Fair Value, Measurements, Nonrecurring | Commercial and Industrial Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 2,192	$ 3,354
Fair Value, Measurements, Nonrecurring | Commercial Real Estate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 2,965	$ 3,438