Employee Benefits (Various Benefits - Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Schedule Of Employee Benefits [Line Items]
Percentage of internal revenue contribution			25.00%
Percentage of internal revenue service limitations			6.00%
Cash surrender value of life insurance	$ 18,359		$ 18,359		$ 18,018
Increase in cash surrender value of insurance	100	$ 101	300	$ 300
Accrued expenses and other liabilities	11,003		11,003		10,108
Noninterest expense	6,832	$ 6,473	20,798	19,240
Employer contribution in defined contribution plan			643	577	570
Net earnings on Bank Owned Life Insurance			300	300
Postretirement Life Insurance [Member]
Schedule Of Employee Benefits [Line Items]
Liability related to these postretirement benefits	1,316		1,316		1,276
Postemployment benefit expense			40	40
Postemployment Retirement Benefits [Member]
Schedule Of Employee Benefits [Line Items]
Noninterest expense			67	75
Liability related to these postretirement benefits	2,128		2,128		2,108
Officer [Member] | Deferred Compensation, Share-based Payments [Member]
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities	1,013		1,013		975
Noninterest expense			405	379
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	$ 1,945		1,945		$ 1,687
Noninterest expense			$ 91	$ 95
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