Fair Value (Additional Information) (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-Sale, at Fair Value		$ 14,184,000		$ 14,184,000		$ 4,263,000
Contractual principal balance of loan held for sale		13,925,000		13,925,000		4,231,000
Difference in amount of loan held for sale		259,000		259,000		32,000
Impaired loans, carrying amount	[1]	6,288,000		6,288,000		6,757,000
Valuation allowance for loans losses		1,907,000		1,907,000		1,826,000
Other real estate carried at fair value less cost to sell		0		0		0
Other real estate, adjustments to carrying value less costs to charged to earnings				0		0
90 Days Past Due or Non-accrual
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-Sale, at Fair Value		0		0		0
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		840,692,000		840,692,000		812,611,000
Loans Held-for-Sale, at Fair Value		14,184,000		14,184,000		4,263,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		4,506,000		4,506,000		4,991,000
Loans Held-for-Sale, at Fair Value		0		0		0
Obligations of State and Political Subdivisions | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		303,284,000		303,284,000		294,533,000
Obligations of State and Political Subdivisions | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities		4,506,000		4,506,000		4,991,000
Commercial Real Estate Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired loans, carrying amount		5,134,000		5,134,000		6,561,000
Valuation allowance for loans losses		1,549,000		1,549,000		1,823,000
Increase (decrease) to provision for loan losses		$ 123,000	$ 191,000	$ (273,000)	$ (856,000)	$ (411,000)

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