Fair Value (Quantitative Information of Fair Value Measurements) (Details) - Significant Unobservable  Inputs (Level 3) - Individually Analyzed Loans $ in Thousands	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Commercial and Industrial Loans | Sales comparison approach | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.30	0.29
Commercial and Industrial Loans | Sales comparison approach | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	1	1
Commercial and Industrial Loans | Sales comparison approach | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.60	0.64
Commercial Real Estate Loans | Sales comparison approach | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.30	0.47
Commercial Real Estate Loans | Sales comparison approach | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	1	0.91
Commercial Real Estate Loans | Sales comparison approach | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.39	0.64
Agricultural Loans | Sales comparison approach | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.30
Agricultural Loans | Sales comparison approach | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	1
Agricultural Loans | Sales comparison approach | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.66
Consumer Loans | Sales comparison approach | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.24
Consumer Loans | Sales comparison approach | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.99
Consumer Loans | Sales comparison approach | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.34
Home Equity Loans | Sales comparison approach | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.09
Home Equity Loans | Sales comparison approach | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.09
Home Equity Loans | Sales comparison approach | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.09
Residential Mortgage Loans | Sales comparison approach | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.19
Residential Mortgage Loans | Sales comparison approach | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	0.93
Residential Mortgage Loans | Sales comparison approach | Weighted Average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Range (Weighted Average)	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	$ 4,778	$ 2,109
Fair Value, Measurements, Nonrecurring | Commercial Real Estate Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	9,372	$ 493
Fair Value, Measurements, Nonrecurring | Agricultural Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	550
Fair Value, Measurements, Nonrecurring | Consumer Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	18
Fair Value, Measurements, Nonrecurring | Home Equity Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	368
Fair Value, Measurements, Nonrecurring | Residential Mortgage Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 191