Fair Value Measurements, Quantitative Information About Unobservable Inputs Used In Recurring And Nonrecurring Level 3 Inputs (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net income	$ 4,250,000	$ 4,727,000	$ 14,333,000	$ 14,082,000
Less allocation of earnings and dividends to participating securities	10,000	7,000	33,000	24,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 4,240,000	$ 4,720,000	$ 14,300,000	$ 14,058,000
Weighted average common shares outstanding, gross (in shares)	12,967,460	12,951,701	12,964,582	13,157,538
Less average participating securities (in shares)	29,595	18,751	29,595	22,404
Basic (in shares)	12,937,865	12,932,950	12,934,987	13,135,134
Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 2,186,000		$ 2,186,000		$ 3,037,000
Nonrecurring [Member] | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	2,186,000		2,186,000		3,037,000
Nonrecurring [Member] | Impaired Loans, Fair Value Calculated Using Estimated Sales Price [Domain] | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	1,591,000		1,591,000		1,931,000
Nonrecurring [Member] | Impaired Loans, Fair Value Calculated Using Discounted Cash Flows | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	595,000		595,000		909,000
Nonrecurring [Member] | Other Real Estate Owned | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value					197,000
Measurement Input, Discount Rate | Nonrecurring [Member] | Impaired Loans, Fair Value Calculated Using Discounted Cash Flows | High [Member] | Level 3 [Member] | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	0.0825		0.0825		0.0825
Measurement Input, Discount Rate | Nonrecurring [Member] | Impaired Loans, Fair Value Calculated Using Discounted Cash Flows | Low [Member] | Level 3 [Member] | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	0.0450		0.0450		0.0450
Measurement Input, Discount Rate | Nonrecurring [Member] | Impaired Loans, Fair Value Calculated Using Discounted Cash Flows | Weighted Average | Level 3 [Member] | Valuation, Income Approach
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 0.0661		$ 0.0661		$ 0.0683