Employee Benefits (Various Benefits - Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) fund	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
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
Number of fixed income funds | fund	4
Number of bond funds | fund	3
Number of real estate funds | fund	1
Cash surrender value of life insurance	$ 18,554		$ 18,457
Increase in cash surrender value of insurance	97	$ 100
Accrued expenses and other liabilities	16,851		11,156
Noninterest expense	7,299	6,918
Employer contribution in defined contribution plan	246	225
Postretirement Life Insurance [Member]
Schedule Of Employee Benefits [Line Items]
Liability related to these postretirement benefits	1,344		1,330
Postemployment benefit expense	14	13
Postemployment Retirement Benefits [Member]
Schedule Of Employee Benefits [Line Items]
Noninterest expense	22	24
Liability related to these postretirement benefits	2,129		2,123
Officer [Member] | Deferred Compensation, Share-based Payments [Member]
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities	1,181		1,163
Noninterest expense	149	137
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	1,795		$ 2,086
Noninterest expense	$ 10	$ 32
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