Fair Value (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016		Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-Sale, fair value	$ 15,273,000		$ 10,762,000
Contractual principal balance of Loans Held-for-Sale	14,983,000		10,559,000
Difference in amount of Loan Held-for-Sale	290,000		203,000
Impaired loans, carrying amount	1,575,000	[1]	3,610,000	[2]
Valuation allowance for loans losses	355,000		1,202,000
Other real estate, carrying value	0		0
Cost of real estate sales charged through operating income	75		0
Impaired Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, carrying amount	1,428,000		2,148,000
Valuation allowance for loans losses	355,000		1,173,000
Provision for loan losses	(215,000)		286,000
Obligations of State and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other changes in fair value	(75,000)		(6,000)
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities	709,786,000		637,840,000
Fair Value, Measurements, Recurring | Obligations of State and Political Subdivisions
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities	247,519,000		203,628,000
Fair Value, Measurements, Recurring | Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities	353,000		353,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities	7,648,000		9,373,000
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	7,295,000		9,020,000
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities	$ 353,000		$ 353,000

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

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