Employee Benefits (Various Benefits - Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) fund	Dec. 31, 2018 USD ($) fund
Schedule Of Employee Benefits [Line Items]
Percentage of internal revenue contribution		25.00%
Percentage of internal revenue service limitations		6.00%
Number of investment funds | fund		11
Number of equity funds | fund		7	6
Number of bond funds | fund		3	3
Number of real estate funds | fund		1	1
Cash surrender value of life insurance		$ 18,457	$ 18,018
Increase in cash surrender value of insurance		398	401
Accrued expenses and other liabilities		11,156	10,108
Noninterest expense		27,925	26,120
Employer contribution in defined contribution plan		828	782
Scenario, Plan [Member]
Schedule Of Employee Benefits [Line Items]
Estimated net actuarial loss	$ 285
Postretirement Life Insurance [Member]
Schedule Of Employee Benefits [Line Items]
Liability related to these postretirement benefits		1,330	1,276
Postemployment benefit expense		54	16
Postemployment Retirement Benefits [Member]
Schedule Of Employee Benefits [Line Items]
Noninterest expense		78	94
Liability related to these postretirement benefits		2,123	2,108
Officer [Member] | Deferred Compensation, Share-based Payments [Member]
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities		1,163	975
Noninterest expense		593	586
Deferred Compensation Arrangement with Individual, by Type of Compensation, Pension and Other Postretirement Benefits [Member] | Director [Member]
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities		2,086	1,687
Noninterest expense		$ 126	$ 129
Maximum | Postemployment Retirement Benefits [Member]
Schedule Of Employee Benefits [Line Items]
Post retirement benefit period		20 years
Maximum | Officer [Member] | Deferred Compensation, Share-based Payments [Member]
Schedule Of Employee Benefits [Line Items]
Terms of services		5 years
Minimum | Postemployment Retirement Benefits [Member]
Schedule Of Employee Benefits [Line Items]
Post retirement benefit period		15 years
Minimum | Officer [Member] | Deferred Compensation, Share-based Payments [Member]
Schedule Of Employee Benefits [Line Items]
Terms of services		1 year