Fair Value Measurements, Quantitative Information About Unobservable Inputs Used In Recurring And Nonrecurring Level 3 Inputs (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Net income	$ 5,290,000	$ 5,057,000	$ 10,530,000	$ 10,083,000
Less allocation of earnings and dividends to participating securities	19,000	12,000	38,000	23,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 5,271,000	$ 5,045,000	$ 10,492,000	$ 10,060,000
Weighted average common shares outstanding, gross (in shares)	12,789,684	12,970,570	12,815,089	12,963,123
Less average participating securities (in shares)	45,958	29,595	45,958	29,595
Basic (in shares)	12,743,726	12,940,975	12,769,131	12,933,528
Nonrecurring [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	$ 1,065,000		$ 1,065,000		$ 3,439,000
Nonrecurring [Member] | Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value	1,065,000		1,065,000		3,439,000
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					1,352,000
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	1,065,000		1,065,000		2,087,000
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	0.0400		0.0400		0.0400
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	$ 0.0612		$ 0.0612		$ 0.0474