Fair Value (Narrative) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, carrying amount	[1]	$ 7,229,000	$ 6,757,000
Valuation allowance for loans losses		3,371,000	1,826,000
Other real estate carried at fair value less cost to sell		0	0
Other real estate, adjustments to carrying value less costs to sell charged to earnings		0	0
Impaired Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, carrying amount		5,574,000	6,561,000
Valuation allowance for loans losses		2,971,000	1,823,000
Increase (decrease) in provision for loan losses		1,149,000	(411,000)
Loans Held-for-Sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Gain (losses) from changes in fair value included in earnings		303,000	(111,000)	$ (147,000)
Obligations of State and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total gains (losses) included in earnings attributable to changes in fair value		(25,000)	(69,000)
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		854,825,000	812,611,000
Fair Value, Measurements, Recurring | Obligations of State and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		324,300,000	294,533,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		4,021,000	4,991,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Obligations of State and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		$ 4,021,000	$ 4,991,000

[1] Unpaid Principal Balance is the remaining contractual payments gross of partial charge-offs and discounts.