Employee Benefits (Various Benefits - Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) fund	Sep. 30, 2019 USD ($)	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
Accrued expenses and other liabilities	$ 17,150		$ 17,150		$ 11,156
Noninterest expense	7,432	$ 6,832	21,496	$ 20,798
Employer contribution in defined contribution plan			732	643
Postretirement Life Insurance [Member]
Schedule Of Employee Benefits [Line Items]
Liability related to these postretirement benefits	1,373		1,373		1,330
Postemployment benefit expense			43	40
Postemployment Retirement Benefits [Member]
Schedule Of Employee Benefits [Line Items]
Noninterest expense			65	67
Liability related to these postretirement benefits	2,140		2,140		2,123
Officer [Member] | Deferred Compensation, Share-based Payments [Member]
Schedule Of Employee Benefits [Line Items]
Accrued expenses and other liabilities	1,214		1,214		1,163
Noninterest expense			419	405
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	$ 2,221		2,221		$ 2,086
Noninterest expense			$ 131	$ 91
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