Fair Values of Financial Instruments (Quantitative Information about Unobservable Inputs used in Recurring and Nonrecurring Level Three Fair Value Measurements) (Details)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, available for sale	$ 385,622,000	$ 370,875,000
Pooled Trust Preferred Securities | Valuation Technique, Discounted Cash Flow [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 2,198,000	$ 2,355,000
Pooled Trust Preferred Securities | Discount rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs	6.3	6.8
Pooled Trust Preferred Securities | Constant prepayment rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs	2.0	2.0
Pooled Trust Preferred Securities | Cumulative projected prepayment rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs	40.0	40.0
Pooled Trust Preferred Securities | Default rate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs	1.6	1.7
Pooled Trust Preferred Securities | Projected cures given deferral | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs	0	0
Pooled Trust Preferred Securities | Projected cures given deferral | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs	15.0	15.0
Pooled Trust Preferred Securities | Loss Severity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unobservable inputs	26.5	21.4
Other real estate owned | Third Party Valuations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 188,000
Other real estate owned | Discount to reflect realizable value less estimated selling costs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Real Estate Owned, Measurement Input	20.0
Impaired Loans | Third Party Valuations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 460,000
Impaired Loans | Discount to reflect realizable value less estimated selling costs | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans, Measurement Input	7.2
Impaired Loans | Discount to reflect realizable value less estimated selling costs | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Loans, Measurement Input	34.9